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1580069 
Journal Article 
Stability of Colorimetric Reagent for Chromium, s-Diphenylcarbazide, in Various Solvents 
Urone, PF 
1955 
Yes 
Analytical Chemistry
ISSN: 0003-2700
EISSN: 1520-6882 
NIOSH/00051274 
27 
8 
1354-1355 
The deterioration and sensitivity of s-diphenylcarbazide, a widely used colorimetric reagent for chromium (7440473), were studied in a variety of solutions involving seven organic solvents. Nonaqueous ethyl-acetate (141786) and acetone (67641) solutions were stable for months; methyl-ethyl-ketone (78933), methyl-cellosolve (109864), and 2-propanol (67630) solutions were usable for 1 to 2 weeks. Aqueous solutions, solvents tending to be basic, and solvents containing traces of water or basic impurities do not make good solvents for stock solutions of the colorimetric reagent. 
DCN-178462; Analytical methods; Chromium VI; Colorimetry 
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