用过氧化氢氧化溴邻苯三酚红的催化动力学光度法测定钢中的微量铬  

Spectrophotometric Catalytic Determination of Micro\|Amount of Chromium in Steel Based on the Oxidation of Bromopyrogallol Red by Hydrogen Peroxide

作　　者：陆振荣[1] 项苏留 陈恕华 

机构地区：[1]苏州大学分析测试中心 [2]镇江师范学校化学系

出　　处：《光谱实验室》1999年第3期251-254,共4页Chinese Journal of Spectroscopy Laboratory

摘　　要：提出了借助于微酸性溶液中用过氧化氢催化氧化溴邻苯三酚红测定微量铬（Ⅵ）的方法，研究了指示反应的最佳条件和各种离子的干扰影响。用Ａｒｒｈｅｎｉｕｓ方程计算了催化与非催化反应表观活化能。校准曲线的线性范围为０．１－０．６μｇＣｒ（Ⅵ）／２５ｍＬ，检出限为９．１×１０－１０ｇ／ｍＬ。Chromium() was determined based on its catalytic effect on the decolorization of bromopyrogallol red with hydrogen peroxide in weakly acidic solutions. The optimum condition of indicator reaction and interference effect of various ions were also studied. The apparent activation energy of catalytic and noncatalytic reaction were calculated by using Arrhenius equation. The calibration curve is linear for 0.10.6 g Cr()/25mL. Its detection limit reached down to 9.110-10gmL-1. The method was successfully applied to the determination of microamount chromium in the steel.

关 键 词：分光光度法 铬 测定 催化动力学 

分 类 号：TG142.15[一般工业技术—材料科学与工程]