:Strontium chromate
{{chembox
| verifiedrevid =
| Name = Strontium chromate
| ImageFile = Strontiumchromaat.png
| ImageFile2 = Strontiumchromat.png
| OtherNames = C.I. Pigment Yellow 32
C.I. 77839
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref =
| ChemSpiderID =
| InChI = 1S/Cr.4O.Sr/q;;;2*-1;+2
| InChIKey = NVKTUNLPFJHLCG-UHFFFAOYSA-N
| SMILES = [O-][Cr](=O)(=O)[O-].[Sr+2]
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI =
| StdInChIKey_Ref =
| StdInChIKey =
| CASNo = 7789-06-2
| CASNo_Ref = {{cascite|correct|CAS}}
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = 2W214M3GS2
| PubChem = 24599
| RTECS = GB3240000
| EINECS = 232-142-6
}}
|Section2={{Chembox Properties
| Formula = SrCrO4
| Appearance = yellow powder
| Odor =
| MolarMass = 203.614 g/mol
| Density = 3.353 g/cm3
| Solubility = 0.12 g/100 mL (15 °C)
3 g/100 mL (100 °C)
| SolubleOther = Soluble in dilute acids and ammonia
| MeltingPt =
| MeltingPt_notes =
| BoilingPt =
| RefractIndex =
| MagSus = −5.1·10−6 cm3/mol
}}
|Section3={{Chembox Structure
| CrystalStruct = monoclinic
}}
|Section7={{Chembox Hazards
| NFPA-H =
| NFPA-F =
| NFPA-R =
| NFPA-S =
| LD50 = 3118 mg/kg (rat, oral)
}}
|Section8={{Chembox Related
| OtherCations = Magnesium chromate
Barium chromate
}}
}}
Strontium chromate is an inorganic compound with the formula {{chem2|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 {{convert|100|C|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?|reason=What is the purpose of doing so, and how would the white color be visible past the bright colors of the soluble chromates?|date=March 2025}} leaving the chromate or dichromate in solution.{{citation needed|date=March 2025}}
Uses
- Corrosion inhibitor in pigments
- In electrochemical processes to control sulphate concentration of solutions
- Colorant in polyvinyl chloride resins
- Pyrotechnics
- 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.{{cite web |url=https://cameo.mfa.org/wiki/Strontium_yellow |title=Strontium yellow |date=2022-06-06 |department= |website=CAMEO database |publisher=Museum of Fine Arts, Boston |access-date=2023-02-14 |url-status= |archive-url= |archive-date= |via= |quote= }}
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.{{Cite web |title=Strontium chromate - Hazardous Agents {{!}} Haz-Map |url=https://haz-map.com/Agents/41 |access-date=2025-03-03 |website=haz-map.com}}{{Cite web |title= |url=https://www.atsdr.cdc.gov/toxprofiles/tp159-c8.pdf}}{{Cite web |last=PubChem |title=Strontium Chromate |url=https://pubchem.ncbi.nlm.nih.gov/compound/strontium%20chromate |access-date=2025-03-03 |website=pubchem.ncbi.nlm.nih.gov |language=en}}
References
{{reflist}}
{{Strontium compounds}}
{{Chromates and dichromates}}
{{Shades of yellow}}
{{Authority control}}
{{inorganic-compound-stub}}