Sodium Chromate(VI)
Title: Sodium Chromate(VI)
CAS Registry Number: 7775-11-3
Additional Names: Neutral sodium chromate
Molecular Formula: CrNa2O4
Molecular Weight: 161.97
Percent Composition: Cr 32.10%, Na 28.39%, O 39.51%
Line Formula: Na2CrO4
Literature References: Crystallizes as a tetra- or decahydrate. Manuf: Faith, Keyes & Clark's Industrial Chemicals, F. A. Lowenheim, M. K. Moran, Eds. (Wiley-Interscience, New York, 4th ed., 1975) pp 731-736. Diagnostic use of labeled compound in GI bleeding: A. Lussier et al., Semin. Arthritis Rheum. 17, Suppl. 2, 40-45 (1988). Review of use as radiolabel for blood elements: Diagnostic and Investigational Uses of Radiolabeled Blood Elements, R. J. Davey, M. E. Wallace, Eds., (Am. Assoc. Blood Banks, Arlington, 1987) 118 pp.
 
Derivative Type: Tetrahydrate
Properties: Yellow, somewhat deliquesc crystals. Sol in about 1 part water, slightly in alcohol. The aq soln is alkaline. Keep well closed. The decahydrate is unstable with respect to water content. mp ~20°.
Melting point: mp ~20°
 
Derivative Type: 51Cr-Labeled compound
CAS Registry Number: 10039-53-9
Additional Names: Sodium chromate- 51Cr; sodium radio-chromate(51Cr)
Trademarks: Chromitope Sodium (BMS); Rachromate-51 (Abbott)
Molecular Formula: 51CrNa2O4
Properties: Prepd from radioactive chromium (51Cr) which has a half-life of 27.7 days. The emission of gamma rays is applicable to biological tagging and tracing. Other properties identical to those of unlabeled sodium chromate.
 
CAUTION: Chromium hexavalent compounds are listed as known human carcinogens: Report on Carcinogens, Eleventh Edition (PB2005-104914, 2004) p III-63.
Use: Protection of iron against corrosion and rusting.
Therap-Cat: 51Cr-labeled compound as diagnostic aid (blood volume determination; blood cell survival).

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