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Cr(VI)的测定对于环境监测以及电镀液的控制与分析极为重要。目前国内外文献中,六价铬的测定大都采用二苯基碳酰二肼光度法,该法灵敏度不高,也不甚稳定。本文提出在溴化十六烷基三甲铵(下称CTAB)存在下,用溴邻苯三酚红(下称BPR)作显色剂光度法测定六价铬(三价铬不和BPR产生显色反应)的新方法,本法灵敏度高(表观摩尔吸光系数ε_(635)=3.64×10~4),在pH5.3—5.8时,Cr(Ⅵ)-BPR-CTAB生成蓝色络合物,最大
The determination of Cr (VI) is extremely important for environmental monitoring and control and analysis of plating solutions. At present, the literature at home and abroad, the determination of hexavalent chromium are mostly used diphenyl carbazide spectrophotometry, the method of sensitivity is not high, nor stable. In this paper, hexavalent trimethyl ammonium bromide (hereinafter referred to as CTAB) with bromopyrogallol red (hereinafter referred to as BPR) as a reagent spectrophotometric determination of hexavalent chromium (trivalent chromium and BPR was significantly (635) = 3.64 × 10 ~ 4). At pH5.3-5.8, Cr (Ⅵ) -BPR-CTAB produced a blue complex Material, the largest