Calcium arsenate

Calcium arsenate
Calcium arsenate
Calcium arsenate
Names
IUPAC name
Calcium arsorate
Other names
Calcium orthoarsenate
Cucumber dust
Tricalcium arsenate
Tricalcium ortho-arsenate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.003 Edit this at Wikidata
EC Number
  • 233-287-8
KEGG
RTECS number
  • CG0830000
UNII
  • InChI=1S/2AsH3O4.3Ca/c2*2-1(3,4)5;;;/h2*(H3,2,3,4,5);;;/q;;3*+2/p-6 ☒N
    Key: RMBBSOLAGVEUSI-UHFFFAOYSA-H ☒N
  • InChI=1/2AsH3O4.3Ca/c2*2-1(3,4)5;;;/h2*(H3,2,3,4,5);;;/q;;3*+2/p-6
    Key: RMBBSOLAGVEUSI-CYFPFDDLAC
  • [O-][As](=O)([O-])[O-].[O-][As](=O)([O-])[O-].[Ca+2].[Ca+2].[Ca+2]
Properties
Ca3(AsO4)2
Molar mass 398.072 g/mol
Appearance white powder
Odor odorless
Density 3.62 g/cm3, solid
Melting point 1,455 °C (2,651 °F; 1,728 K) (decomposes)
0.013 g/100 mL (25 °C)[1]
Solubility in Organic solvents insoluble
Solubility in acids soluble
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 carcinogen[2]
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
4
0
0
Flash point noncombustible[2]
Lethal dose or concentration (LD, LC):
20 mg/kg (rat, oral)
82 mg/kg (rat, oral)
74 mg/kg (mouse, oral)
50 mg/kg (rabbit, oral)
38 mg/kg (dog, oral)[3]
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 0.010 mg/m3[2]
REL (Recommended)
 Ca C 0.002 mg/m3 [15-minute][2]
IDLH (Immediate danger)
 5 mg/m3 (as As)[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Calcium arsenate is the inorganic compound with the formula Ca3(AsO4)2. A colourless salt, it was originally used as a pesticide and as a germicide. It is highly soluble in water, in contrast to lead arsenate, which makes it more toxic. Two minerals are hydrates of calcium arsenate: rauenthalite Ca3(AsO4)2·10H2O and phaunouxite Ca3(AsO4)2·11H2O.[4] A related mineral is ferrarisite (Ca5H2(AsO4)4·9H2O.[5]

  1. ^ Tartar, H.V.; Wood, L; Hiner, E; A Basic Arsenate of Calcium. J. Am. Chem. Soc. 1924, vol. 46, 809-813.
  2. ^ a b c d e NIOSH Pocket Guide to Chemical Hazards. "#0089". National Institute for Occupational Safety and Health (NIOSH).
  3. ^ "Calcium arsenate (as As)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  4. ^ Bari, Hubert; Catti, Michele; Ferraris, Giovanni; Ivaldi, Gabriella; Permingeat, François (1982). "Phaunouxite Ca3(AsO4)2•11H2O, a New Mineral Strictly Associated with Rauenthalite". Bulletin de Minéralogie. 105 (4): 327–332. doi:10.3406/bulmi.1982.7624.
  5. ^ Bari, Hubert; Permingeat, François; Pierrot, Roland; Walenta, Kurt (1980). "La ferrarisite Ca5H2(AsO4)4.9 H2O, une Nouvelle Espèce Minérale Dimorphe de la Guérinite". Bulletin de Minéralogie. 103 (5): 533–540. doi:10.3406/bulmi.1980.7417.