离子交换树脂相-偏最小二乘回归光度法同时测定痕量金、铂、钯的研究

Ion Exchange Resin Phase-Partial Least Squares Regression Spectrophotometry for the Simultaneous Determination of Gold, Platinum and Palladium

本文根据Au^(3+)、Pt^(2+)、Pd^(2+)易与CI^-形成稳定络阴离子后被阴离子交换树脂所吸附这一特性,较好地解决了痕量贵金属的富集及大部分干扰离子的分离问题.以硫代米蚩酮为显色剂,直接对显色后的树脂进行光度测量,采用偏最小二乘回归法解析体系的重叠峰,进行Au、Pt、Pd同时测定.相对标准偏差Au:5.6%,Pt:3.1%,Pd:1.8%.为痕量贵金属计算光度分析开辟了新途径.

Au3+ ,Pt2+ and Pd2+easily react with Cl to form complex anions which can be adsorbed by anion exchange resin. By use of this characteristic, the separation of noble metals from interference ions has been resolved. Using 4,4' -bis(dimethylamino)-thiobenzophenone as a developing agent, the resin developed is determined directly. Adopting partial least squares regression method, the overlap spectrum of noble elements is decomposed, and the multicomponents are determined simultaneously. Because the operation of separating and developing is finished simultaneously, the method has the characteristic of simple operation, high sensitivity and selectivity. The mixtures of Au, Pt and Pd have been analysed, and the results are satisfactory. The accuracy and precision of the method fulfil the requirements of trace elements analysis.