Arsenic compounds have been used by humans for several thousand years. Historically, arsenic was used for medicinal purposes in the treatment of ailments such as trypanosomiasis, amoebic dysentery and syphilis. Arsenic compounds are currently used as pesticides, wood presevatives and in glass and electronics manufacture. Sodium arsenate (Na2HAsO4) has been used to deback tress, in cattle and sheep dips and also in the control of aquatic weeds. (ref. ID; 6126)

[Potassium Arsenate(V)] CAS[7784-41-0] UN1677
Chemical formula; KH2AsO4
Test organisms;
Protozoa: Euglena gracilis (ref. ID; 3312)

[Sodium Arsenate(V) Heptahydrate] CAS[10048-95-0]
Chemical formula; Na2HAsO4/7H2O
Chemical characteristics; water soluble
Test organisms;
Oligochaeta: Dendrodrilus rubidus (ref. ID; 4481)
Oligochaeta: Eisenia fetida (ref. ID; 4447)
Oligochaeta: Enchytraeus albidus (ref. ID; 4447)
Oligochaeta: Lumbricus rubellus (ref. ID; 4481, 6860, 6909)
Oligochaeta: Tubifex tubifex (ref. ID; 1318)

[Sodium Arsenite(III)] CAS[7784-46-5] UN2027
= Sodium Metaarsenite
Chemical formula; NaAsO2
Chemical characteristics; water soluble
Test organisms;
Protozoa: Euglena gracilis (ref. ID; 3312)
Nematoda: Caenorhabditis elegans (ref. ID; 506, 2165)

[AsO3Na]
Test organisms;
Protozoa: Colpidium campylum (ref. ID; 6081)

[Na3AsO3]
Test organisms;
Oligochaeta: Tubifex tubifex (ref. ID; 6968)

[Soil As pollution]
Test organsims;
Oligochaeta: review (ref. ID; 6126)
Oligochaeta: Lumbricus rubellus (ref. ID; 6909, 6912)

[Diarsenic Pentaoxide]
Trade name; arsenic(V) oxide: Zotox
Chemical formula; As2O5
Purpose for use; fungicide, herbicide, insecticide
Toxicity; LD50 (oral): rat 8 mg/kg

[Diarsenic Trioxide] CAS[1327-53-3] UN1561
Trade name; arsenic(III) oxide
Chemical formula; As2O3
Purpose for use; herbicide, insecticide
Toxicity; LD50 (oral): rat 180-200 mg/kg, mouse 34.4-63.5 mg/kg