【作者】 凌立新； 侯勇； 黄艳； 李微； 何家洪；

【Author】 Ling Lixin,Hou Yong,uang Yan,Li Wei,He Jiahong Chemistry and environment Engineering College,Chongqing University of Arts and sciences,Yongchuan 402168,China

【机构】 重庆文理学院化学与环境工程学院；

【摘要】 在硫酸介质中,铋（Ⅲ）对碘酸钾氧化生物染料曙红B的褪色反应有强烈催化作用,据此建立了测定痕量铋（Ⅲ）的光度分析法。铋（Ⅲ）浓度在0.002～0.012μg·mL^-1范围内与吸光度变化值（ΔA）呈良好线性关系。方法检出限为7.22×10^-11g·L^-1,表观速率常数为2.97×10^-4s^-1,表观活化能为36.74KJ·mol^-1。方法用于自来水和矿场水中痕量铋（Ⅲ）的测定,结果满意,加标回收率为98.5%～104.2%。更多还原

【Abstract】 In the H₂SO₄ and heated condition,discoloration reaction during potassium iodate oxidizing bromeosin B can be catalyzed by bismuth（Ⅲ）.According to this phenomenon,a new method of trace bismuth（m） determination by catalytic kinetic spectrophotometry was established.Best experimental conditions were discussed.DifferentΔA between non-catalytic reaction absorbency A₀ and catalytic reaction absorbency A remained a good linear relationship with mass concentration bismuth（Ⅲ） in the range of 0.002～0.012μg·mL^-1 and the detection limits was 7.22×10^-11g·L^-1. The kinetic parameter of this reaction was also determined and the result showed that the reaction was first-order reaction.The apparent ratio constant was 2.97×10^-4s^-1,and apparent active energy of the reaction was 36.74KJ·mol^-1. The method was applied to the determination of trace bismuth（Ⅲ） in water sample and the recovery ratio was between 98.5%～104.2%.更多还原