A Differential Method of Analysis for Trivalent and Hexavalent Chromium in Sea-water

概要

論文の詳細を見る
A differential method of analysis for trivalent and hexavalent chromium in sea-water was developed. The principle of the method depends on independent measurements of two equivalent samples from the same water sample, one treated by direct coprecipitation of chromium with iron hydroxide and the other by a similar coprecipitation after reduction of hexavalent chromium with sodium sulfite. During the analytical procedures the recovery of chromium is checked by adding chromium-51 as a radioactive tracer. Finally, chromium is estimated spectrophotometrically on the coloration with diphenylcarbazide reagent. The lower limit of quantitative determination of chromium by this method is around 0.02μg Cr/<I>l</I>. The standard deviations of the results obtained by this method for trivalent and hexavalent chromium in microgram quantities are estimated to be around 15 and 20 percent, respectively.
日本海洋学会の論文