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Saturday, April 18, 2020

Nature reserve

From Wikipedia, the free encyclopedia
The Bee Lick Creek, of the Jefferson Memorial Forest, was designated as a National Audubon Society wildlife refuge.
 
A nature reserve (also known as a natural reserve, wildlife refuge, wildlife sanctuary, biosphere reserve or bioreserve, natural or nature preserve, or nature conservation area), is a protected area of importance for flora, fauna, or features of geological or other special interest, which is reserved and managed for purposes of conservation and to provide special opportunities for study or research. They may be designated by government institutions in some countries, or by private landowners, such as charities and research institutions. Nature reserves fall into different IUCN categories depending on the level of protection afforded by local laws. Normally it is more strictly protected than a nature park. Various jurisdictions may use other terminology, such as ecological protection area or private protected area in legislation and in official titles of the reserves.

History

Charles Waterton established the first nature reserve in 1821.

Cultural practices that roughly equate to the establishment and maintenance of reserved areas for animals date back to antiquity, with King Tissa of Ceylon establishing one of the world's earliest wildlife sanctuaries in the 3rd century BC. Early reservations often had a religious underpinning, such as the 'evil forest' areas of West Africa which were forbidden to humans, who were threatened with spiritual attack if they went there. Sacred areas taboo from human entry to fishing and hunting are known by many ancient cultures worldwide.

The world's first modern nature reserve was established in 1821 by the naturalist and explorer Charles Waterton around his estate in Walton Hall, West Yorkshire. He spent £9000 on the construction of a three-mile long, 9 ft tall wall to enclose his park against poachers. He tried to encourage bird life by planting trees and hollowing out trunks for owls to nest in.


Waterton invented artificial nest boxes to house starlings, jackdaws and sand martins; and unsuccessfully attempted to introduce little owls from Italy. Waterton allowed local people access to his reserve and was described by David Attenborough as "one of the first people anywhere to recognise not only that the natural world was of great importance but that it needed protection as humanity made more and more demands on it".

Drachenfels (Siebengebirge) was protected as the first state-designated nature reserve in modern-day Germany; the site was bought by the Prussian State in 1836 to protect it from further quarrying.

The first major nature reserve was Yellowstone National Park in Wyoming, United States, followed by the Royal National Park near Sydney, Australia and the Barguzin Nature Reserve of Imperial Russia, the first of zapovedniks set up by a federal government entirely for the scientific study of nature.

Around the world

There are several national and international organizations that oversee the numerous non-profit animal sanctuaries and refuges in order to provide a general system for sanctuaries to follow. Among them, the American Sanctuary Association monitors and aids in various facilities to care for exotic wildlife. The number of sanctuaries has substantially increased over the past few years.

Australia

In Australia, a nature reserve is the title of a type of protected area used in the jurisdictions of the Australian Capital Territory, New South Wales, Tasmania and Western Australia. The term "nature reserve" is defined in the relevant statutes used in those states and territories rather than by a single national statute. As of 2016, 1767 out of a total of 11044 protected areas listed within the Australian National Reserve System used the term "nature reserve" in their names.

Brazil

In Brazil, nature reserves are classified as ecological stations (Portuguese: )estações ecológicas) or biological reserves (Portuguese: reservas biológicas) by the National System of Conservation Units. Their main objectives are preserving fauna and flora and other natural attributes, excluding direct human interference. Visits are allowed only with permission, and only for educational or scientific purposes. Changes to the ecosystems in both types of reserve are allowed to restore and preserve the natural balance, biological diversity and natural ecological processes. Ecological stations are also allowed to change the environment within strictly defined limits (e.g. affecting no more than three percent of the area or 1,500 hectares (3,700 acres), whichever is less) for the purpose of scientific research. A wildlife reserve in Brazil is also protected, and hunting is not allowed, but products and by-products from research may be sold.

The wildlife refuge in Brazil has as its objective protecting natural flora and fauna where conditions are assured for the existence and reproduction of species or communities of the local flora and the resident or migratory fauna. It can be constituted by private areas, as long as it is possible to make compatible the objectives of the unit with the utilization of the land of the natural resources of the location by the landowners. Public visitation is subject to the conditions and restrictions established by the management plan of the unit and to the regulations established by the body most important for its administration and scientific research depends on previous authorization from the body responsible for the administration of the unit and is subject to the conditions and restrictions established by this body.

Canada

In Canada, UNESCO has recognized 18 nature reserves, mostly along the Niagara Escarpment and St. Lawrence River in Ontario.

Federally, Canada recognizes 55 National Wildlife Areas across the country, containing species of ecological significance. The relevant Ministry is known as Environment and Climate Change Canada, which protects these areas under legislation known as the Canada Wildlife Act. The areas comprise approximately 1 million hectares of habitat, half of which is marine habitat, for the purpose of conservation and research.

Many conservation groups protect nature reserves in Canada as well, including Nature Conservancy Canada, Ducks Unlimited, and Escarpment Biosphere Conservancy. These charities operate to protect wilderness on privately owned lands, including through Canada's Ecological Gifts Program.

Egypt

There are 30 nature reserves in Egypt which cover 12% of Egyptian land. Those nature reserves were built according to the laws no. 102/1983 and 4/1994 for protection of the Egyptian nature reserve. Egypt announced a plan from to build 40 nature reserves from 1997 to 2017, to help protect the natural resources and the culture and history of those areas. The largest nature reserve in Egypt is Gebel Elba (35,600 square kilometres (13,700 sq mi)) in the southeast, on the Red Sea coast.

Europe

A bridged stone river in Bistrishko Branishte, an early Bulgarian nature reserve established in 1934.

Denmark

Denmark has three national parks and several nature reserves, some of them inside the national park areas. The largest single reserve is Hanstholm Nature Reserve, which covers 40 km2 (9,900 acres) and is part of Thy National Park.

Sweden

In Sweden, there are 29 national parks. The first of them was established in 1909. In fact, Sweden was the first European country that established 9 national parks. There are almost 4,000 nature reserves in Sweden. They comprise about 85% of the surface that is protected by the Swedish Environmental Code.

Estonia

In Estonia, there are 5 national parks, more than 100 nature reserves, and around 130 landscape protection areas. The largest nature reserve in Estonia is Alam-Pedja Nature Reserve, which covers 342 km2 (85,000 acres).

France

As of 2017, France counts 10 national parks, around 50 regional nature parks, and 8 marine parks.

Germany

In 1995 Germany had 5,314 nature reserves (German: Naturschutzgebiete) covering 6,845 km2 (2,643 sq mi), the largest total areas being in Bavaria with 1,416 km2 (547 sq mi) and Lower Saxony with 1,275 km2 (492 sq mi).

Hungary

Nature reserve near Budapest, next to Lake Naplás
 
In Hungary, there are 10 national parks, more than 15 nature reserves and more than 250 protected areas. Hortobágy National Park is the largest continuous natural grassland in Europe and the oldest national park in Hungary. It is situated on the eastern part of Hungary, on the plain of the Alföld. It was established in 1972. There are alkaline grasslands interrupted by marshes. They have a sizable importance because there are the fishponds. One of the most spectacular sights of the park is the autumn migration of cranes. Some famous Hungarian animal species live in Hortobágy National Park, such as the grey cattle, racka long-wool sheep living only in Hungary, Hungarian horses and buffalo. Hortobágy National Park has been a UNESCO World Heritage Site since 1 December 1999.

Poland

Path on Szczeliniec Wielki, a famous nature reserve in the Stołowe Mountains in SW Poland

As of 2011, Poland has 1469 nature reserves.

Portugal

Nature reserves are one of the 11 types of protected areas in Portugal. As of 2012, Portugal had a total of 46 protected areas, which represented 6,807.89 km2 (2,628.54 sq mi) of land and 463.94 km2 (179.13 sq mi) of marine surfaces. Among the protected areas, nine are classified as nature reserve (Portuguese: reserva natural).

Romania

About 5.18% of the area of Romania has a protected status (12,360 km²), including the Danube Delta, which makes up half of this area (2.43% of Romania's total area).

Switzerland

The Limmatspitz nature reserve of Pro Natura
 
The Swiss National Park, created in 1914, was one of the earliest national parks in Europe. In addition to the Swiss National Park, Switzerland also has sixteen regional nature parks.

The environmental organization Pro Natura takes care of about 650 nature reserves of various sizes throughout Switzerland (250 square kilometers).

India

India's 18 biospheres extend over a total of 85,940 square kilometres (33,180 sq mi) and protect larger areas than typical national parks in other countries. The first national reserve of India was established in 1986.

Israel

Israel's National parks of Israel are declared historic sites or nature reserves, which are mostly operated and maintained by the National Nature and Parks Authority. As of 2019, Israel maintains more than 490 nature reserves that protect 2,500 species of indigenous wild plants, 20 species of fish, 530 species of birds and 70 species of mammals. Total, they cover (6,400 square kilometres (2,500 sq mi)) of nature reserves, approximately 28% of Israel land. In 1984, the two areas with the highest number of nature reserves were the South (15.2%) and Samaria (the Shomron, 13.5%).

Japan

Under the Nature Conservation Law, places can be designated as 'wilderness areas', 'nature conservation areas' and 'prefectural nature conservation areas'. In 1995, when the Japanese Government published its information in English, there were 5 wildernesses, 10 nature conservation areas and 516 prefectural nature conservation areas.

Jordan

There are seven nature reserves in Jordan. In 1966 the organization that would later start Jordan's nature reserves, the Royal Society for the Conservation of Nature, was founded. RSCN's first efforts involved bringing back severely endangered species. In 1973, RSCN was given the right to issue hunting licenses, giving RSCN an upper hand in preventing extinction. The first step was the founding of Jordan's first nature reserve, Shaumari Wildlife Reserve, in 1975. The primary purpose was to create means to breed endangered species, specifically: the Arabian oryx, gazelles, ostriches, and Persian onagers in their natural environment.

Kyrgyzstan

By the end of 2009 there were 10 nature reserves (Kyrgyz: корук, koruk) in Kyrgyzstan covering 600,000 hectares (6,000 km2) or about three percent of the total area of the country.

New Zealand

New Zealand has a variety of types of reserve, including national parks, various types of conservation areas (including stewardship land that is yet to be officially classified), and seven specific types of "reserve", each of which prioritize various degrees of protection to different amenities such as scenery, recreation, flora and fauna, scientific value, or history. Land is often sub-categorised beneath its general classification, as defined in law between the Reserves Act of 1977, the National Parks Act of 1980, and the Conservation Act of 1987. Under these classifications, the Department of Conservation administers more than 80,000 square kilometres (31,000 sq mi)—nearly 30% of the nation's total area—with at least some degree of protection. This land is composed of 14 National Parks, 30 Conservation Parks, and approximately 8,900 discrete areas of land in total.

Although the most public land is strongly protected for natural preservation, the term nature reserve is specifically defined in the Reserves Act to mean a reserve that prioritizes the protection of rare flora and fauna, to the extent that public access is by permit only. Some of these reserves include Ecological Islands, a comparatively new concept in wildlife preservation, pioneered in New Zealand to help rebuild the populations of nearly extinct birds, and other species that are heavily threatened by introduced predators.

Nicaragua

Peñas Blancas, part of the Bosawás Biosphere Reserve is the second largest rainforest in the Western Hemisphere, after the Amazonian Rainforest in Brazil. Located northeast of the city of Jinotega in Northeastern Nicaragua.
 
In Nicaragua, the Ministry of the Environment and Natural Resources (MARENA) is in charge of environmental protection and of the study, planning, and management of Nicaragua's natural resources. Nearly one-fifth of the territory is designated as protected areas like national parks, nature reserves (including the Bosawás Biosphere Reserve), and biological reserves. Nicaragua has 78 protected areas that cover 22,422 km2, about 17.3% of the nation's landmass. Private nature reserves exist with land excluded from private land trusts and maintained at the sole cost of the proprietor. For example, "O Parks, WildLife, and Recreation" was established within the Mesoamerican Biological Corridor by former FDNY firefighter Kevin Michael Shea, who purchased 46 acres (0.19 km2) of land in this manner and is an example of this type of private nature reserve.

Russia

There are around 100 nature reserves (Russian: заповедник, zapovednik) in Russia, covering some 330,000 square kilometres (130,000 sq mi), or about 1.4% of the country's total area. A few of them predate the October Revolution of 1917, but most have been created during the Soviet Union era. There are also natural protected areas where only certain species are protected, or only certain activities are prohibited; those are known as zakaznik (Russian: заказник).

Unofficial sanctuaries can also occur as a result of human accidents; the Chernobyl Exclusion Zone has in practice become a wildlife refuge since very few people live in the area. Wildlife has flourished in the zone since the Chernobyl nuclear accident in 1986.

South Africa

South Africa is well known for its many nature reserves. The oldest nature reserve in the country (and oldest conservation area in the world) is the Groenkloof Nature Reserve that was established in 1892 in the capital city Pretoria in the old South African Republic and current Republic of South Africa. The country has many national parks but the best-known is the Kruger National Park, which was announced in 1898, and is the largest, at nearly 2,000,000 hectares (20,000 km2). The Kruger Park and Table Mountain National Park are two of South Africa's most visited tourist attractions. South Africa also has a number of World Heritage Sites and provincial game reserves including Shamwari, Londolozi, Sanbona and Lalibela. The country currently has 20 national parks covering 3,700,000 hectares (37,000 km2), about 3% of the total area of South Africa.

Sri Lanka

The area around Mihintale, Sri Lanka as a sanctuary for wildlife, probably the first of its generation in the ancient world. According to stone inscriptions found in the vicinity, the king commanded the people not to harm animals or destroy trees within the area.

Ukraine

There are 4 biosphere reserves (two of them are dated 1927 and 1874) and 17 nature reserves in Ukraine, covering 160,000 hectares. Ukraine administers 40 national parks, 2632 habitat management areas, 3025 nature monuments, and 1430 other preservations.

United Kingdom

There are some differences between the regulations for England, Northern Ireland, Scotland and Wales, which are separately managed. 

At the end of March 2004, there were 215 national nature reserves in England with a total area of 879 square kilometers. The reserves are scattered through England, from Lindisfarne in Northumberland to The Lizard in Cornwall. Nearly every rural county has at least one. Many national nature reserves contain nationally important populations of rare flowers, ferns and mosses, butterflies and other insects, and nesting and wintering birds. Examples include unique alpine plants at Upper Teesdale and the field of snake's head fritillaries at North Meadow, Cricklade, Wiltshire.

There are now over 1,050 local nature reserves in England. They range from windswept coastal headlands, ancient woodlands and flower-rich meadows to former inner-city railways, long-abandoned landfill sites and industrial areas now re-colonized by wildlife. In total, they cover almost 40,000 ha—an impressive natural resource which makes an important contribution to England's biodiversity. A good example is Rye Harbour Nature Reserve in East Sussex, where a network of footpaths enables visitors to explore shingle, saltmarsh, saline lagoon, reedbed, and grazing marsh habitats. 

Through the Natural Heritage (Scotland) Act 1991 the Scottish Natural Heritage (SNH) was established in 1992 as a government body, responsible to the Scottish Government Ministers and through them to the Scottish Parliament. At 31 March 2008, there were 65 Scottish national nature reserves with a total area of approximately 1330 square kilometres. Section 21 of the National Parks and Access to the Countryside Act 1949 gives local authorities the exclusive statutory power to establish a local nature reserve in consultation with the SNH.

United States

 
In the United States, the U.S. Fish and Wildlife Service, managed by the Secretary of the Interior, is responsible for managing many of the federal nature reserves including the National Wildlife Refuge System. The National Wildlife Refuge System includes areas administered for the protection and conservation of fish and wildlife that are threatened with extinction, as well as wildlife ranges, game ranges, wildlife management areas, and waterfowl production areas.

The first North American wildlife refuge, Lake Merritt Wildlife sanctuary at Lake Merritt, was established by Samuel Merritt and enacted in California state law in 1870 as the first government owned refuge. The first federally owned refuge in the United States is Pelican Island National Wildlife Refuge and was established by Theodore Roosevelt in 1903 as part of his Square Deal campaign to improve the country. At the time, setting aside land for wildlife was not a constitutional right of the president. In 2006, a bi-partisan group of US House of Representatives members established the Congressional Wildlife Refuge Caucus to further support the needs of the National Wildlife Refuge System in Congress

There are also state-level administered State Nature Reserves found throughout the country, as well as smaller reserves operated by local governments, private trusts, or even funded through public donations. Private nature reserves also exist, with land excluded from private land trusts and maintained at the sole cost of the proprietor, such as the 1,800 acres (730 ha) Wilbur Hot Springs.

Borax

From Wikipedia, the free encyclopedia

Borax
Borax crystals
Ball-and-stick model of the unit cell of borax decahydrate
Names
IUPAC name
Sodium tetraborate decahydrate
Other names
Borax decahydrate
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
EC Number
  • 215-540-4
E number E285 (preservatives)
KEGG
PubChem CID
UNII
Properties
Na2B4O7·10H2O or Na2[B4O5(OH)4]·8H2O
Molar mass 201.22 (anhydrous)
381.38 (decahydrate)
Appearance white solid
Density 2.4 g/cm3 (anhydrous, solid)
1.73 g/cm3 (decahydrate, solid)
Melting point 743 °C (1,369 °F; 1,016 K) (anhydrous)
75 °C (decahydrate, decomposes)
Boiling point 1,575 °C (2,867 °F; 1,848 K) (anhydrous)
31.7 g/L (both)
−85.0·10−6 cm3/mol (anhydrous)
n1=1.447, n2=1.469, n3=1.472 (decahydrate)
Structure
Monoclinic, mS92, No. 15
C2/c
2/m
a = 1.1885 nm, b = 1.0654 nm, c = 1.2206 nm
α = 90°, β = 106.623°°, γ = 90°
1.4810 nm3
4
Pharmacology
S01AX07 (WHO)
Hazards
GHS pictograms GHS08: Health hazard
H360
P201, P308+313
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
0
1
0
NIOSH (US health exposure limits):
PEL (Permissible)
none
REL (Recommended)
TWA 1 mg/m3 (anhydrous and pentahydrate) TWA 5 mg/m3 (decahydrate)
IDLH (Immediate danger)
N.D.
Related compounds
Other anions
Sodium aluminate
Other cations
Lithium tetraborate
Related compounds
Boric acid, sodium perborate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate, is an important boron compound, a mineral, and a salt of boric acid. Powdered borax is white, consisting of soft colorless crystals that dissolve in water. A number of closely related minerals or chemical compounds that differ in their crystal water content are referred to as borax, and the word is usually used to refer to the octahydrate. Commercially sold borax is partially dehydrated.

Borax is a component of many detergents, cosmetics, and enamel glazes. It is used to make buffer solutions in biochemistry, as a fire retardant, as an anti-fungal compound, in the manufacture of fiberglass, as a flux in metallurgy, neutron-capture shields for radioactive sources, a texturing agent in cooking, as a cross-linking agent in slime, as an alkali in photographic developers, as a precursor for other boron compounds, and along with its inverse, boric acid, is useful as an insecticide.

In artisanal gold mining, borax is sometimes used as part of a process (as a flux) meant to eliminate the need for toxic mercury in the gold extraction process, although it cannot directly replace mercury. Borax was reportedly used by gold miners in parts of the Philippines in the 1900s.

Borax was first discovered in dry lake beds in Tibet and was imported via the Silk Road to the Arabian Peninsula in the 8th century AD. Borax first came into common use in the late 19th century when Francis Marion Smith's Pacific Coast Borax Company began to market and popularize a large variety of applications under the 20 Mule Team Borax trademark, named for the method by which borax was originally hauled out of the California and Nevada deserts.

Chemistry

The structure of borax according to X-ray crystallography.

Structure

The term borax is often used for a number of closely related minerals or chemical compounds that differ in their crystal water content:
  • anhydrous sodium tetraborate, Na2B4O7
  • sodium tetraborate pentahydrate, Na2B4O7·5H2O
  • sodium tetraborate decahydrate, Na2B4O7·10H2O or equivalently the octahydrate, Na2B4O5(OH)4·8H2O
From the chemical perspective, borax contains the [B4O5(OH)4]2− ion. In this structure, there are two four-coordinate boron centers and two three-coordinate boron centers.

Reactions

Borax is also easily converted to boric acid and other borates, which have many applications. Its reaction with hydrochloric acid to form boric acid is:
Na2B4O7·10H2O + 2 HCl → 4 B(OH)3 + 2 NaCl + 5H2O
The "decahydrate" is sufficiently stable to find use as a primary standard for acid base titrimetry.

When borax is added to a flame, it produces a yellow green color. Borax is not used for this purpose in fireworks due to the overwhelming yellow color of sodium. Boric acid is used to color methanol flames a transparent green.

Borax is very soluble in ethylene glycol, moderately soluble in diethylene glycol and methanol, slightly soluble in acetone. It is poorly soluble in cold water, but its solubility increases significantly with temperature.

Etymology

The English word borax is Latinized: the Middle English form was boras, from Old French boras, bourras. That may have been from medieval Latin baurach (another English spelling), borac(-/um/em), borax, along with Spanish borrax (> borraj) and Italian borrace, in the 9th century. Another name for borax is tincal, from Sanskrit.

The word tincal /ˈtɪŋkəl/ "tinkle", or tincar /ˈtɪŋkər/ "tinker", refers to crude borax, before it is purified, as mined from lake deposits in Tibet, Persia, and other parts of Asia. The word was adopted in the 17th century from Malay tingkal and from Urdu/Persian/Arabic تنکارtinkār/tankār; thus the two forms in English. These all appear to be related to the Sanskrit टांकण ṭānkaṇa.

Natural sources

Borax "cottonball"

Borax occurs naturally in evaporite deposits produced by the repeated evaporation of seasonal lakes. The most commercially important deposits are found in: Turkey; Boron, California; and Searles Lake, California. Also, borax has been found at many other locations in the Southwestern United States, the Atacama desert in Chile, newly discovered deposits in Bolivia, and in Tibet and Romania. Borax can also be produced synthetically from other boron compounds.

Naturally occurring borax (known by the trade name Rasorite–46 in the United States and many other countries) is refined by a process of recrystallization.

Traction steam engine hauling borax, Death Valley National Park, California, 1904

Uses

Borax-based laundry detergent

Household products

Borax is used in various household laundry and cleaning products, including the "20 Mule Team Borax" laundry booster, "Boraxo" powdered hand soap, and some tooth bleaching formulas.

pH buffer

Borate ions (commonly supplied as boric acid) are used in biochemical and chemical laboratories to make buffers, e.g. for polyacrylamide gel electrophoresis of DNA and RNA, such as TBE buffer (borate buffered tris-hydroxymethylaminomethonium) or the newer SB buffer or BBS buffer (borate buffered saline) in coating procedures. Borate buffers (usually at pH 8) are also used as preferential equilibration solution in dimethyl pimelimidate (DMP) based crosslinking reactions.

Co-complexing agent

Borax as a source of borate has been used to take advantage of the co-complexing ability of borate with other agents in water to form complex ions with various substances. Borate and a suitable polymer bed are used to chromatograph non-glycosylated hemoglobin differentially from glycosylated hemoglobin (chiefly HbA1c), which is an indicator of long term hyperglycemia in diabetes mellitus.

Water-softening agent

Borax alone does not have a high affinity for the hardness cations, although it has been used for water-softening. Its chemical equation for water-softening is given below:
Ca2+ (aq) + Na2B4O7 (aq)CaB4O7 (s)↓ + 2 Na+ (aq)
Mg2+ (aq) + Na2B4O7 (aq)MgB4O7 (s)↓ + 2 Na+ (aq)
The sodium ions introduced do not make water ‘hard’. This method is suitable for removing both temporary and permanent types of hardness.

Flux

A mixture of borax and ammonium chloride is used as a flux when welding iron and steel. It lowers the melting point of the unwanted iron oxide (scale), allowing it to run off. Borax is also used mixed with water as a flux when soldering jewelry metals such as gold or silver, where it allows the molten solder to wet the metal and flow evenly into the joint. Borax is also a good flux for "pre-tinning" tungsten with zinc — making the tungsten soft-solderable. Borax is often used as a flux for forge welding.

Small-scale gold mining

Old steam tractor and borax wagons, Death Valley National Park
 
Borax is replacing mercury as the preferred method for extracting gold in small-scale mining facilities. The method is called the borax method and is used in the Philippines.

Flubber

A rubbery polymer sometimes called Slime, Flubber, 'gluep' or 'glurch' (or erroneously called Silly Putty, which is based on silicone polymers), can be made by cross-linking polyvinyl alcohol with borax. Making flubber from polyvinyl acetate-based glues, such as Elmer's Glue, and borax is a common elementary-science demonstration.

Food additive

Borax, given the E number E285, is used as a food additive, but is banned in some countries, such as the United States, China, and Thailand. As a consequence, certain foods, such as caviar, produced for sale in the United States contain higher levels of salt to assist preservation. In addition to its use as a preservative, borax imparts a firm, rubbery texture to food. In China, borax (Chinese: 硼砂; pinyin: péng shā or Chinese: 月石; pinyin: yuè shí) has been found in foods including wheat and rice noodles named; lamian, shahe fen, kway teow, and chee cheong fun. In Indonesia, it is a common, but forbidden, additive to such foods as noodles, bakso (meatballs), and steamed rice. The country's Directorate of Consumer Protection warns of the risk of liver cancer with high consumption over a period of five to ten years.

Other uses

Rio Tinto borax mine pit, Boron, California

Medicinal

Other

Toxicity

Borax, sodium tetraborate decahydrate, according to one study, is not acutely toxic. Its LD50 (median lethal dose) score is tested at 2.66 g/kg in rats, meaning that a significant dose of the chemical is needed to cause severe symptoms or death. The lethal dose is not necessarily the same for humans. On pesticide information websites it is listed as a non-lethal compound and of no hazardous concerns.
Borax has been in use as an insecticide in the United States with various restrictions since 1946. All restrictions were removed in February 1986 due to the low toxicity of borax, as reported in two EPA documents relating to boric acid and borax.
EPA has determined that, because they are of low toxicity and occur naturally, boric acid and its sodium salts should be exempted from the requirement of a tolerance (maximum residue limit) for all raw agricultural commodities.
Although it cited inconclusive data, a re-evaluation in 2006 by the EPA still found that "There were no signs of toxicity observed during the study and no evidence of cytotoxicity to the target organ." In the reevaluation, a study of toxicity due to overexposure was checked and the findings were that "The residential handler inhalation risks due to boric acid and its sodium salts as active ingredients are not a risk concern and do not exceed the level of concern..." but that there could be some risk of irritation to children inhaling it if used as a powder for cleaning rugs.

Sodium tetraborate decahydrate has no known hazard issues.

Conditions defined as "over-exposure" to borax dust can cause respiratory irritation, while no skin irritation is known to exist due to borax. Ingestion may cause gastrointestinal distress including nausea, persistent vomiting, abdominal pain, and diarrhea. Effects on the vascular system and human brain include headaches and lethargy, but are less frequent. "In severe poisonings, a beefy red skin rash affecting palms, soles, buttocks and scrotum has been described.

Possible carcinogen

The Indonesian Directorate of Consumer Protection warns of the risk of liver cancer with high consumption of borax over a period of 5–10 years.

Risk to fertility and pregnancy

Borax was added to the Substance of Very High Concern (SVHC) candidate list on December 16, 2010. The SVHC candidate list is part of the EU Regulations on the Registration, Evaluation, Authorisation and Restriction of Chemicals 2006 (REACH), and the addition was based on the revised classification of borax as toxic for reproduction category 1B under the CLP Regulations. Substances and mixtures imported into the EU which contain borax are now required to be labelled with the warnings "May damage fertility" and "May damage the unborn child". It was proposed for addition to REACH Annex XIV by the ECHA on July 1, 2015. If this recommendation is approved, all imports and uses of borax in the EU will have to be authorized by the ECHA.

Review of the boron toxicity (as boric acid and borates) published 2012 in Journal of Toxicology and Environmental Health concluded: "It clearly appears that human B [boron] exposures, even in the highest exposed cohorts, are too low to reach the blood (and target tissue) concentrations that would be required to exert adverse effects on reproductive functions."

A draft risk assessment released by Health Canada in July 2016 has found that overexposure to boric acid has the potential to cause developmental and reproductive health effects. Since people are already exposed to boric acid naturally through their diets and water, Health Canada advised that exposure from other sources should be reduced as much as possible, especially for children and pregnant women. The concern is not with any one product, but rather multiple exposures from a variety of sources. With this in mind, the department also announced that registrations for certain pesticides that contain boric acid, which are commonly used in homes, will have their registrations cancelled and be phased out of the marketplace. As well, new, more protective label directions are being introduced for other boric acid pesticides that continue to be registered in Canada (for example, enclosed bait stations and spot treatments using gel formulations).

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