H. Gowda, S. A. Ahmed
1976
Citations
0
Influential Citations
2
Citations
Journal
Fresenius Journal of Analytical Chemistry
Abstract
Promethazine hydrochloride (I) was used as indicator in ceriometric titrns. of Fe(II), U(IV), and hydroquinone in dil. H2SO4-H3PO4. I undergoes a reversible 1-electron oxidn. to a red radical, which is oxidized irreversibly to a colorless sulfoxide with the loss of another electron. The redox potential is 842-83 mV in 0.25-1.5M H2SO4. The max. errors in the titrns. of Fe 5-113, U 24-247, and hydroquinone 5-112 mg were 0.03, 0.12, and 0.05 mg, resp. The sensitivity of I to oxidizing agents decreases in the order MnO4- > BrO3- > V5+ > Cr2O72- > Ce4+ > IO3- > [Fe(CN)6]3-. [on SciFinder(R)]