ferric arsenate

ferric arsenate

[′fer·ik ′ärs·ən‚āt]
(inorganic chemistry)
FeAsO4·2H2O A green or brown powder, insoluble in water, soluble in dilute mineral acids; used as an insecticide.
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Additionally, there was one well resolved band, peaked at 825-829 [cm.sup.-1], owing to the As-O stretching vibration of the As-O-Fe coordination of the ferric arsenate (i.e., scorodite) and the surface complex (i.e., protonated Fe[O.sub.2]As(O)(OH) and unprotonated Fe[O.sub.2]As[(O).sup.2.sup.2-] forms) on the precipitates [35].
The process also frees up both the iron and the arsenic, which then combine to form a compound known as ferric arsenate. This compound, which has been found by the Environmental Protection Agency to be a benign substance, sinks to the bottom of the vat and can then be safely disposed of.
The pentoxide will react with hematite to form ferric arsenate, FeAs[O.sub.4], which, if formed, will coat the sulphide particles, hinder further reaction, and block the formation of pores.