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General
- Arsenic is a chemical
element that has the symbol As and atomic number 33.
- Arsenic is very
similar chemically to its predecessor, phosphorus.
- Arsenic has been
known and used in Persia and elsewhere since ancient times.
- Arsenic occurs
naturally in a wide range of minerals, which, together with a once
widespread use of arsenic in pigments, insecticides and herbicides,
represent the major sources of arsenic in natural waters.
Process
- Solar oxidation and
removal of arsenic (SORAS) is a simple method that uses irradiation of
water with sunlight in PET- or other UV-A transparent bottles to reduce
arsenic levels in drinking water.
- Phytoextraction, a
strategy of phytoremediation, uses plants to clean up contaminated soils
and has been successfully applied to arsenic contaminated soils.
- Ferrosand Filter
Media is manufactured to exact specifications to ensure the complete
oxidation of soluble iron, manganese, and arsenic using stoichiometric
quantities of oxidizing agents.
Application
- A therapy uses
arsenic-74, a radioactive isotope that is one of a small number of
positron emitters with a half-life suitable for medical imaging.
- It is used in the
wood-treating chemical chromated copper arsenate.
- Most of the arsenic
used domestically is consumed as the trioxide, mainly in the manufacture
of preservatives for pressure-treated wood but also in the manufacture
of herbicides.
- The major end uses
for arsenic metal are as minor additives in nonferrous metal alloys,
principally lead alloys used in lead-acid storage batteries and certain
copper alloys.
Market
- China was the top
producer of white arsenic with almost 50% world share followed by Chile
and Peru.
- The amount of arsenic
consumed as metal domestically is very small, accounting for probably
less than 3% of total arsenic demand.
- The largest market
basket survey of arsenic in U.S. rice, indicates that rice from
California contains, on average, about 40% less arsenic than rice from
the south central U.S.—Arkansas, Louisiana, Mississippi, Texas, and
Missouri.
- Over 35,000 metric
tons of arsenic has been imported into Florida from places like China,
Chile and Mexico to be used as an ingredient in pressure treating CCA-treated
wood
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