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Sodiumfluoride, sodium fluorosilicate, sodium arsenate , sodium borate, and sodium chlorate are all used as weed or pest-killers.
In the past, farmers have used toxic chemicals such as calcium arsenate , Paris green, dichlorodiphenyltrichloroethane, and toxaphene to rid their cotton crops of insects.
Their oxidation products include an array of arsenates , selenates, and selenites.
Problems arise when chemical reactions change the arsenates into arsenites, which don't bind tightly to other minerals and can therefore enter the underground water supply.
Volume 4 of the Handbook of Mineralogy is, like its predecessors, an invaluable reference work, this time on essentially all the arsenates , phosphates, vanadates, and uranates known through 1999.
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