主成分回归-络合滴定法测定混合金属离子

提出了用络合滴定法测定混合金属离子.以汞膜电极为指示电极,银-氯化银电极为参比电极,以标准EDTA溶液滴定混合金属离子溶液.采集-系列指定电位点处滴定剂的体积,并以主成分回归法处理滴定数据.利用本文方法对铜、锌、铅、钻混合溶液进行了测定,结果满意.

Simultaneous Determination of Mixed Metal Ions by Complexometric Titration and Principal Component Regression

A new method of complexometric titration for determination of mixed metal ions with principal component regression(PCR) was developed. The principle of this method was described and the linear complexometric titration equation was derived. In this work, a mercury film electrode(MFE) was used as the indicator electrode for potentiometric measurements, and a double junction Ag/AgCl electrode as the reference electrode. The mixtures of metal ions were titrated with ethylenediamine teraacetic acid(EDTA), the potentiometric titration data were recorded at each selected potential points and were then treated by chemometric approach of PCR. A set of synthetic mixtures of lead, copper, zinc and cobalt with concentration levels from 0.5 mmol/L to 1.5 mmol/L were analyzed by the proposed method and acceptable results were obtained.