Some Common Uses of Arsenic
There are several uses of arsenic in different fields, from agriculture to military.
- The primary use of arsenic is for the preservation of wood. Since arsenic is poisonous and it is effective in getting rid of insects, fungi and bacteria, it is used in the treatment of wood. This was one of the most widely used industrial applications of arsenic, although most countries banned its use in consumer products due to its high toxicity.
- One of the most important of all arsenic uses is as a doping agent in solid state devices such as transistors. Doping is the process in which an impurity, such as arsenic is added to a semiconductor to increase its conductivity.
- Arsenic, in its inorganic form is used for the production of pressure-treated wood. In wood preservation, chromated copper arsenate is injected into the cellular structure of the wood. Pressure-treated wood is used for commercial, industrial and residential applications including decking, highway noise barriers, landscaping, playground equipment, retaining walls, signposts and utility poles. One of the benefits of using chromated copper arsenate pressure-treated wood is its resistance to rotting and insect attack. The content of chromated copper arsenate in pressure-treated wood is greater where there is higher likelihood of insect infestation. Pressure-treating can increase the wood's life to a great extent.
- Arsenic is also used in the leather tanning industry as a preservative. Widely used as a weed killer, it is often sprayed from a small aircraft over fields to destroy any kind of infestation. It is also used as an insecticide as it is effective in treating termite infestation. But due to the growing popularity of organic pesticides, the amount of arsenic used for agricultural purposes have dramatically decreased.
- Another use of arsenic is as an anti-friction additive in ball bearings and for hardening lead. Arsenic is also used for manufacturing germanium-arsenide-selenide optical materials. Indium-gallium-arsenide was formerly used for short wave infrared technology.
In spite of its toxic properties, arsenic compounds were used in the field of medicine in the 18th and 19th century. Use of arsenic was mostly for the treatment of syphilis, before the discovery of penicillin. Fowler's solution (1% solution of potassium arsenite), discovered in 1786, was used in the treatment of various diseases. Some other arsenic solutions that were used as medicines are arsenic trioxide or Donovan's solution and arsenic trichloride or de Valagin's solution. However, in modern medicine, the use of arsenic for treating certain diseases like cancer is still debatable.
So, we have seen that there are many uses of arsenic besides being the poison of choice for many murders. Several studies have shown a link between arsenic exposure and lung cancer. As it is highly toxic in nature, caution is advised in the use of arsenic.