Copper(II) arsenate
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| IUPAC name
Copper(II) arsenate
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Other names
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
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 solid |
| 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[1] |
| Solubility | insoluble in alcohol soluble in ammonia solution, dilute acids |
| Structure[2] | |
| monoclinic | |
| P21/c | |
a = 6.327 Å, b = 8.642 Å, c = 11.313 Å α = 92.04°, β = 90°, γ = 90°
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Formula units (Z)
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4 units per cell |
| Hazards | |
| GHS labelling:[4] | |
| Danger | |
| H319, H350, H361, H370, H372 | |
| P203, P260, P264, P264+P265, P270, P280, P305+P351+P338, P308+P316, P318, P319, P321, P337+P317, P405, P501 | |
| NIOSH (US health exposure limits): | |
PEL (Permissible)
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TWA 1 mg/m3 (as Cu)[3] |
REL (Recommended)
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TWA 1 mg/m3 (as Cu)[3] |
IDLH (Immediate danger)
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TWA 100 mg/m3 (as Cu)[3] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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Copper arsenate is an inorganic compound with the chemical formula Cu3(AsO4)2·nH2O (n=0,4). It is a blue or bluish-green solid, forming monoclinic crystals.
Occurrence
Anhydrous copper arsenate (Cu3(AsO4)2) is found in nature as the mineral lammerite.[5] The tetrahydrate (Cu3(AsO4)2·4H2O) occurs naturally as the mineral rollandite.[6]
Preparation
Copper arsenate can be prepared by reacting disodium hydrogen arsenate and copper(II) chloride in aqueous solution.[2]
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.
Related compounds
Basic copper arsenates with the formulas Cu2(OH)AsO4 and Cu3(AsO4)(OH)3 have been observed.[7] The former is found naturally as the mineral olivenite.
See also
- Calcium arsenate
- Chromated copper arsenate
- Lead arsenate
- Paris Green (copper acetoarsenite)
- Scheele's Green (copper arsenite)
References
- ^ John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.
- ^ a b Poulsen, Sandra J.; Calvo, C. (1968-03-15). "Crystal structure of Cu3(AsO4)2". Canadian Journal of Chemistry. 46 (6): 917–927. doi:10.1139/v68-153. ISSN 0008-4042.
- ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0150". National Institute for Occupational Safety and Health (NIOSH).
- ^ PubChem. "Copper Arsenate". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-02-18.
- ^ Hawthorne, F. C. (1986). "Lammerite, Cu3(AsO4)2, a modulated close-packed structure" (PDF). American Mineralogist. 71: 206–209.
- ^ Sarp, H.; Černý, R. (2000). "Rollandite, Cu3(AsO4)2·4H2O, a new mineral". Eur. J. Mineral. 12: 1045–1050. doi:10.1127/0935-1221/2000/0012-1045.
- ^ Nelson, Hanna; Shchukarev, Andrey; Sjöberg, Staffan; Lövgren, Lars (2011-05-01). "Composition and solubility of precipitated copper(II) arsenates". Applied Geochemistry. 26 (5): 696–704. doi:10.1016/j.apgeochem.2011.01.028. ISSN 0883-2927.