催化退色光度法测定水中痕量钯(Ⅱ)  

Determination of trace palladium(Ⅱ) in water by catalytic decoloring spectrophotometry

作　　者：罗道成[1] 刘俊峰[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《化学试剂》2006年第10期617-618,626,共3页Chemical Reagents

摘　　要：在非离子表面活性剂Triton X-100存在下,在pH 4.5的HAc-NaAc缓冲溶液介质和加热的条件下,痕量钯（Ⅱ）对H2O2氧化双硫腙的退色反应具有显著催化作用,退色程度与Pd（Ⅱ）量在一定范围内呈线性关系,据此建立了1种测定痕量Pd（Ⅱ）的催化光度法.退色溶液的最大吸收波长为420 nm,方法的线性范围为0～40μg/L,检出限为4.6×10^-7g/L.方法用于水样中痕量钯的测定,结果满意.In the presence of Triton X-100, the trace palladium（Ⅱ） strongly catalyzes the oxidation reaction of dithizone by H2O2 in a buffer solution HAc-NaAc （pH 4.5） while heated in a water bath of 70℃, and the decoloring extent of solution behaves a good linear relationship in a certain range of palladium （ Ⅱ ） concentration. Based on this, a new catalytic decoloring spectrophotometric method for the determination of trace palladium （Ⅱ ） has been established. The results showed that the maximum absorption wavelength of decolofing solution was at 420 nm, the detection limit was 4.6 × 10^-7 g/L and the linear range of palladium（ Ⅱ ） was 0 - 40 μg/L. The method has been applied to the determination of trace palladium in water with satisfactory results.

关 键 词：钯 双硫腙 催化光度法 退色反应 

分 类 号：O657.32[理学—分析化学]