陽イオン界面活性剤ゲル吸着法によるめっき液中の6価クロムの回収(<特集>若手研究者の初論文特集)

概要

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The separation and recovery of chromium(VI) by using a cationic surfactant were investigated. Chromium(VI) reacted with cetylpyridinium chloride (CPC) to form a (HCr_2O_7^-)(CP^+) ion-pair under an acidic condition. This ion-pair was sparingly soluble in water, and was separated as a precipitate with CPC from aqueous solution by centrifugation. In order to desorb the chromium(VI) from CP^+, the reduction of chromium(VI) to chromium(III) having positive charge was performed by using sodium sulfite in the presence of sulfuric acid. Finally, chromium was then recovered as Cr(OH)_3 under a basic condition. Optimization for the quantitative recovery of chromium(VI) was carried out. This method was applied to the recovery of chromium(VI) in chrome plating including Cr(III)+(VI), Fe, Zn, Cu, Al, Mn and Sb.
社団法人日本分析化学会の論文
2004-09-05