用主成分回归法同时测定Zn^(2+)、Cd^(2+)、Pb^(2+)和Cu^(2+)的研究

Study on Determination of Zn^(2+),Cd^(2+),Pb^(2+) and Cu^(2+) by Principal Component Regression

使用聚类分析对不同缓冲体系下Zn2+、Cd2+、Pb2+、Cu2+的吸光度光谱数据分析,通过数量化的方法确定pH值=6.0的最佳缓冲体系。通过单因素实验分析确定缓冲溶液用量为5.0ml、显色剂用量为3.0ml、环糊精用量为2.0ml及最佳显色时间10min。绘制Zn2+、Cd2+、Pb2+、Cu2+的标准曲线,结果表明其具有良好的线性范围和线性加和性。应用主成分回归法计算含有干扰离子的待测水样中Zn2+、Cd2+、Pb2+、Cu2+的浓度,并计算出平均回收率为109.64%、92.77%、98.18%、102.28%,相对标准偏差为11.48%、11.12%、6.34%、4.72%。

This paper use cluster analysis method analyse absorbance spectra data of Zn2＋ .Cd2＋ .Pb2＋ .Cu2＋ in different buffer systems to quantitatively determine the optimal buffer system of pH=6.0. Through the experiment of single factor analysis to determine the best conditions：the dosage of buffer solution was 5ml, the dosage of dithizone was 3ml, the dosage of cyclodextrin was 2ml and the best time of colored was 10min. Drawing the standard curves of Zn2＋ .Cd2＋ .Pb2＋ .Cu2＋, the result shows that it has a good linear range and linear additivity. Combined with the principal component regression to calculated the concentra- tions of Zn2＋ .Cd2＋ .Pb2＋ ,Cu2＋ with containing the interfering ions in water samples, and the the average recovery rate was109.64%, 92.77%, 98. 18%, 102.28%, the relative standard deviation was 11.48%. 11.12%, 6.34%, 4. 72%.