alcium arsenate (Ca3(AsO4)2) is an extremely poisonous chemical compound. It was originally used as a pesticide and as a germicide. It is highly soluble in water, as compared with lead arsenate, which makes it more toxic.
Copper arsenate (Cu3(AsO4)2.H2O, or Cu5H2(AsO4)4.2H2O), also called copper orthoarsenate or tricopper arsenate or tricopper orthoarsenate, is an insecticide used in agriculture. It is also used as a herbicide, fungicide, and a rodenticide.
A poisonous white crystalline compound, Pb3(AsO4)2, used in insecticides and herbicides.
Sodium arsenite is a compound with formula NaAsO2. It is the sodium salt of arsenous acid.
Inorganic arsenic compounds were widely used as pesticides from the mid 1800s to the mid 1900s and in medicine up to the 1970s. Since then the major use area has been wood preservatives, but this use is now in the process of being phased-out (RoC, 2005).
Chromated copper arsenate (CCA) is a wood preservative used for timber treatment since the mid-1930s. It is a mix of copper, chromium, and arsenic formulated as oxides or salts. It preserves the wood from decay fungi, wood attacking insects, including termites, and marine borers. It also improves the weather-resistance of treated timber and may assist paint adherence in the long term.