甲苯浮选2-巯基-β-萘并噻唑分光光度法测定钯

Spectrophotometric determination of palladium with 2-mercapto-β-naphthalenethiazole by methylbenzene floatation

提出了N2-甲苯浮选，Pd（Ⅱ）-2-巯基-β-萘并噻唑（MNT）光度法测定钯的新方法。在硫酸介质中，Pd（Ⅱ）与MNT形成组成比为1：2的红色络合物，该络合物可被N2-甲苯定量浮选，其最大吸收波长位于440nm处。钯（Ⅱ）质量浓度在0．1～100μg／mL范围内符合比尔定律，表观摩尔吸光系数ε440=1．4×10^5L·mol^-1·cm^-1，检出限为1．69×10^-4mg／L。方法已用于钛合金和天然水中钯的测定。

A new spectrophotometric method for the determination of Pd（Ⅱ） in the system of Pd（Ⅱ）-2-mercapto-β-naphthalenethiazole （MNT） by floatation with N2-methylbenzene was established. In the H2SO4 medium, Pd with MNT forms a red complex with the molar ratio of 1 ： 2. The apparent molar absorptivity of the complex at 440 nm is 1.4×10^5L·mol^-1·cm^-1. Beer＇ s law is obeyed in the range of 0.1-100μg/mL for Pd（Ⅱ）, and the detection limit is 1.69×10^-4 mg/L. The proposed method has been applied to the determination of Pd（Ⅱ） in titanium alloy and natural water samples.