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Copper(II) arsenate
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IUPAC name
Copper(II) arsenate
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Other names
Copper arsenate
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Identifiers | |
3D model (JSmol)
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ChemSpider |
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PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
Cu3(AsO4)2 | |
Molar mass | 468.48 g/mol |
Appearance | blue or bluish green powder |
Density | 5.2 g/cm3 |
Melting point | 1,100 °C (2,010 °F; 1,370 K) |
insoluble | |
Solubility product (Ksp)
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7.95×10−36 |
Solubility | soluble in ammonia, dilute acids |
Hazards | |
NIOSH (US health exposure limits): | |
PEL (Permissible)
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TWA 1 mg/m3 (as Cu) |
REL (Recommended)
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TWA 1 mg/m3 (as Cu) |
IDLH (Immediate danger)
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TWA 100 mg/m3 (as Cu) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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 7778-41-8 or 10103-61-4.
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. Copper arsenate tetrahydrate, Cu3(AsO4)2·4H2O, occurs naturally as the mineral rollandite.
Related compounds
Copper arsenate hydroxide or basic copper arsenate (Cu(OH)AsO4) is a basic variant with CAS number 16102-92-4. 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.
See also
- Lead arsenate
- Calcium arsenate
- Paris Green (copper acetoarsenite)
- Chromated copper arsenate
- Scheele's Green (copper arsenite)
External links
Copper compounds
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Cu(0,I) | |
Cu(I) | |
Cu(I,II) | |
Cu(II) | |
Cu(III) | |
Cu(IV) |