Copper(II) arsenate

Copper(II) arsenate
Names
	IUPAC name Copper(II) arsenate
	Other names Copper arsenate
Identifiers
CAS Number	7778-41-8 ;
3D model (JSmol)	Interactive image;
ChemSpider	24279 ;
PubChem CID	26065;
UNII	EV78GZO3YS ;
CompTox Dashboard (EPA)	DTXSID30894196 ;
	InChI InChI=1S/2AsH3O4.3Cu/c22-1(3,4)5;;;/h2(H3,2,3,4,5);;;/q;;3* 2/p-6 Key: RKYSWCFUYJGIQA-UHFFFAOYSA-H ; InChI=1/2AsH3O4.3Cu/c22-1(3,4)5;;;/h2(H3,2,3,4,5);;;/q;;3* 2/p-6 Key: RKYSWCFUYJGIQA-CYFPFDDLAM;
	SMILES [Cu 2].[Cu 2].[Cu 2].[O-][As]([O-])(=O)[O-].[O-][As]([O-])([O-])=O;
Properties
Chemical formula	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)
Solubility in water	insoluble
Solubility product (Ksp)	7.95×10−36
Solubility	soluble in ammonia, dilute acids
Hazards
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3 (as Cu)
REL (Recommended)	TWA 1 mg/m3 (as Cu)
IDLH (Immediate danger)	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). verify (what is ?) Infobox references

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.^[3] Copper arsenate tetrahydrate, Cu₃(AsO₄)₂·4H₂O, occurs naturally as the mineral rollandite.^[4]

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.^[5]

References

^ John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.
^ ^a ^b ^c NIOSH Pocket Guide to Chemical Hazards. "#0150". National Institute for Occupational Safety and Health (NIOSH).
^ 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.
^ "Banned pesticides (Sorted by common name)". Archived from the original on 2005-11-22. Retrieved 2006-01-14.

External links

National Pollutant Inventory - Copper and compounds fact sheet

[crc-1] John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.

[PGCH-2] NIOSH Pocket Guide to Chemical Hazards. "#0150". National Institute for Occupational Safety and Health (NIOSH).

[3] Hawthorne, F. C. (1986). "Lammerite, Cu₃(AsO₄)₂, a modulated close-packed structure" (PDF). American Mineralogist. 71: 206–209.

[4] 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.

[5] "Banned pesticides (Sorted by common name)". Archived from the original on 2005-11-22. Retrieved 2006-01-14.

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