Copper(II) arsenate explained

Copper(II) arsenate should not be confused with Copper arsenite.

Copper arsenate (Cu3(AsO4)2·4H2O, or Cu5H2(AsO4)4·2H2O), also called copper orthoarsenate, tricopper arsenate, cupric arsenate, or tricopper orthoarsenate, is a blue or bluish-green powder insoluble in water and alcohol and soluble in aqueous ammonium and dilute acids. Its CAS number is or .

Uses

Copper arsenate is an insecticide used in agriculture. It is also used as a herbicide, fungicide, and a rodenticide. It is also used as a poison in slug baits.

Copper arsenate can also be a misnomer for copper arsenite, especially when meant as a pigment.

Natural occurrences

Anhydrous copper arsenate, Cu3(AsO4)2, is found in nature as the mineral lammerite.[1] Copper arsenate tetrahydrate, Cu3(AsO4)2·4H2O, occurs naturally as the mineral rollandite.[2]

Related compounds

Copper arsenate hydroxide or basic copper arsenate (Cu(OH)AsO4) is a basic variant with CAS number . It is found naturally as the mineral olivenite. It is used as an insecticide, fungicide, and miticide. Its use is banned in Thailand since 2001.[3]

See also

External links

Notes and References

  1. F. C. . Hawthorne . . 71 . 1986 . 206–209 . Lammerite, Cu3(AsO4)2, a modulated close-packed structure .
  2. Rollandite, Cu3(AsO4)2·4H2O, a new mineral . H. . Sarp . R. . Černý . Eur. J. Mineral. . 12 . 2000 . 1045–1050 . 10.1127/0935-1221/2000/0012-1045 .
  3. Web site: Banned pesticides (Sorted by common name) . 2006-01-14 . dead . https://web.archive.org/web/20051122181117/http://www.ipmthailand.org/en/Pesticides/pesticides_banned_abc.htm . 2005-11-22 .