Strontium chromate

Strontium chromate
Names
	Other names C.I. Pigment Yellow 32; C.I. 77839
Identifiers
CAS Number	7789-06-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	23001;
ECHA InfoCard	100.029.220
EC Number	232-142-6;
PubChem CID	24599;
RTECS number	GB3240000;
UNII	2W214M3GS2 ;
UN number	3077 (STRONTIUM CHROMATE); 3288
CompTox Dashboard (EPA)	DTXSID70872832 ;
	InChI InChI=1S/Cr.4O.Sr/q;;;2*-1;+2 Key: NVKTUNLPFJHLCG-UHFFFAOYSA-N;
	SMILES [O-][Cr](=O)(=O)[O-].[Sr+2];
Properties
Chemical formula	SrCrO4
Molar mass	203.614 g/mol
Appearance	yellow powder
Density	3.353 g/cm3
Solubility in water	0.12 g/100 mL (15 °C) ; 3 g/100 mL (100 °C)
Solubility	Soluble in dilute acids and ammonia
Magnetic susceptibility (χ)	−5.1·10−6 cm3/mol
Structure
Crystal structure	monoclinic
Hazards
	GHS labelling:[1]
Pictograms
Signal word	Danger
Hazard statements	H302, H350, H410
Precautionary statements	P203, P264, P270, P273, P280, P301+P317, P318, P330, P391, P405, P501
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	3118 mg/kg (rat, oral)
Related compounds
Other cations	Magnesium chromate ; Barium chromate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Strontium chromate is an inorganic compound with the formula SrCrO₄.

Preparation

Strontium chromate is prepared from strontium chloride and sodium chromate, or from strontium carbonate and sodium dichromate.

Reactions

Strontium chromate is approximately 30 times more soluble in water at 100 °C (212 °F) than at room temperature. Therefore, the yellow strontium chromate can be suspended in a hot solution of a soluble sulfate to digest until fully converted to the much less soluble and white strontium sulfate,^[why?] leaving the chromate or dichromate in solution.^{[citation needed]}

Uses

Corrosion inhibitor in pigments
In electrochemical processes to control sulphate concentration of solutions
Colorant in polyvinyl chloride resins
Pyrotechnics^[1]
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.^[1]

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 IARC (International Agency for Research on Cancer)—proven to cause lung cancer in humans.^[2]^[3]^[4]