偏最小二乘（PLS）分光光度法同时测定镉、汞、铅

Partial Least-Square Method for the Simultaneous Spectrophotometric Determination of Cd(Ⅱ),Hg(Ⅱ)and Pb(Ⅱ)

本文研究了溴化十六烷三甲铵基（ＣＴＭＡＢ）存在时，ｍｅｓｏ－四（４－磺酸苯基）卟啉（ＴＰＰＳ４）与Ｃｄ（Ⅱ）、Ｈｇ（Ⅱ）、Ｐｂ（Ⅱ）在室温下发生高灵敏度的显色反应条件以及应用偏最小二乘（ＰＬＳ）法同时测定三组分的方法。由微型计算机处理实验数据可以迅速得到三组分的浓度，本文还定义了未知样品与标准样之间的相关系数Ｑｒ，通过Ｑｒ值的大小预报未知样测试结果的准确性。利用此法可以提高测定速度、可靠性和选择性。

The conditions for the formation of highly sensitive colouration between meso-tetra(4-sulfonatophenyl)porphyrin (TPPS4)and Cd(Ⅱ),Hg(Ⅱ)or Pb(Ⅱ)in the presence of cetyltrimethylammonium bromide were studied.A partial least-square(PLS) method was applied to the simultaneous determination of the above three metal ions.The correlation coefficient Qr between unknown samples and standards has been defined in this paper.The magnitude of Qr gives a measure of the accuracy of unknown sample determination,The method has the abvantages of time-saving,reliability and selectivity.