ジフェニルカルバジドによるクロム(VI)の光度定量条件及び鉄,バナジウムの影響

概要

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Re-examination of conditions for the photometric determination of chromium(VI) with diphenylcarbazide gave the following results : a suitable sulfuric acid concentration, 0.02 to 1.0N; a suitable volume of 0.25% diphenylcarbazide solution, 0.5 to 2.0ml per 25ml of final solution. The acetone solution of diphenylcarbazide was more stable than the ethanol solution. Five diphenylcarbazide reagents commercially available were tested. They could be divided into two groups-One giving a molar absorptivity of 4.3×10^4 l mol^<-1> cm^<-1> at 542nm and the other giving 3.5×10^4. The result of the elemental analysis indicated that the latter group reagents were an approximately equimolar mixture of diphenylcarbazide and phenylsemicarbazide. In the determination of to 10μg of chromium in 0.2 or 0.5N sulfuric acid solution, 0.1mg of iron(III) did not interfere if an Eastman diphenylcarbazide was used. However, an appreciable error was observed if a Tokyo Kasei Kogyo reagent was used. When either of the reagents was used, 0.1mg of vanadium(V) did not interfere with the determination of 1 to 10μg of chromium in 0.2 or 0.5N sulfuric add solution.
社団法人日本分析化学会の論文
1978-11-05