偏最小二乘催化极谱法同时测定铂、钯、铑

Partial Least Squares /Catalytic Polarography of Simultaneous Determination of Platinum, Palladium and Rhodium

应用 Ｍ２７３Ａ电化学系统中的线性扫描技术，确定了 ０．７５ ｍｏｌ／Ｌ Ｈ２ＳＯ４－１．５％ＮＨ４Ｃｌ－２．８ ｍｍｏｌ／Ｌ（ＣＨ２）６Ｎ４－０．００２５％Ｎ２Ｈ４·Ｈ２ＳＯ４为偏最小二乘极谱法同时测定 Ｐｔ、Ｐｄ、Ｒｈ的最佳极谱体系。Ｐｔ、Ｐｄ、Ｒｈ的线性范围分别为 ０～３．２ ｍｇ／Ｌ、０～１５．０ ｍｇ／Ｌ和 ０～１．０ｍｇ／Ｌ。模拟样品及实际样品的回收率在９０．３％～１０７．７％之间。

Some conditions of simultaneous determination of Pt, Pd and Rh are studied with linear sweep voltammetry at M273A electrochemical system by PLS catalytic polarography. The experimental results show that the optimum electrolyte is 0. 75 mol/L H2SO4-1. 5 % NH4Cl-2. 8 mmol/L (CH2)6N4-0. 0025%N2H4·H2SO4. The linear ranges of Pt, Pd and Rh determination are 0-3. 2 mg/L, 0-1. 5 mg/L and 0-1. 0 mg/L respectively. The imitative and practical samples are analyzed by this method and the recoveries of Pt, Pd and Rh are between 90. 3% and 107. 7%.