Strontium chromate

Chemical compound From Wikipedia, the free encyclopedia

Strontium chromate is an inorganic compound with the formula SrCrO4.

Quick facts Names, Identifiers ...
Strontium chromate
Sample of strontium chromate
Sample of strontium chromate
Names
Other names
  • C.I. Pigment Yellow 32
  • C.I. 77839
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.220 Edit this at Wikidata
EC Number
  • 232-142-6
RTECS number
  • GB3240000
UNII
UN number 3288
  • InChI=1S/Cr.4O.Sr/q;;;2*-1;+2
    Key: NVKTUNLPFJHLCG-UHFFFAOYSA-N
  • [O-][Cr](=O)(=O)[O-].[Sr+2]
Properties
SrCrO4
Molar mass 203.61 g·mol−1
Appearance yellow powder
Density 3.895 g/cm3[1]
  • 0.12 g/100 mL (15 °C (59 °F))
  • 3 g/100 mL (100 °C (212 °F))
Solubility Soluble in dilute acids and ammonia
−5.1×10−6 cm3/mol
Structure[2]
monoclinic
P21/c
2/m
a = 7.504 Å, b = 6.842 Å, c = 8.729 Å
α = 53.477°, β = 90°, γ = 90°
360.142 Å3
4
Hazards
GHS labelling:[3]
GHS07: Exclamation markGHS08: Health hazardGHS09: Environmental hazard
Danger
H302, H317, H330, H335, H341, H350, H361, H410
P201, P202, P260, P264, P270, P271, P272, P273, P280, P284, P301+P312+P330, P302+P352, P304+P340+P310, P308+P313, P333+P313, P362+P364, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
[1]
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
0.0002 mg/m3 (TWA), 0.0005 mg/m3 (Skin)[1] (STEL)
Lethal dose or concentration (LD, LC):
811 mg/kg (rat, oral)[1]
0.27–0.51 mg/L (Rat, 4h)[1]
NIOSH (US health exposure limits):[1]
PEL (Permissible)
 0.1 mg/m3
REL (Recommended)
 0.0002 mg/m3 (TWA)
IDLH (Immediate danger)
 15 mg/m3
Related compounds
Other cations
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation

Strontium chromate is prepared from strontium chloride and sodium chromate, or from strontium carbonate and sodium dichromate.[citation needed]

Uses

  • Corrosion inhibitor in pigments.
  • In electrochemical processes to control sulfate concentration of solutions.
  • Colorant in polyvinyl chloride resins.
  • Pyrotechnics.[4]
  • Aluminium flake coatings.
  • As an anti-corrosive primer for zinc, magnesium, aluminium, and alloys used in aircraft manufacture.
  • As a pigment used in oil painting named strontium yellow.[4]

Health hazards

Strontium chromate is a toxic and carcinogenic compound, primarily due to its hexavalent chromium (Cr6+) content. It is classified as a Group 1 carcinogen by the International Agency for Research on Cancer (IARC) which indicates that it is considered to be proven to cause cancer in humans, particularly lung cancer.[5][6]

References

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