文献类型：期刊文献

英文题名：Multivariate calibration of on-line enrichment near-infrared (NIR) spectra and determination of trace lead in water

作者：Huang, Zixia[1];Tao, Wei[1];Fang, Juanjuan[1];Wei, Xuemei[1];Du, Yiping[1]

机构：[1]E China Univ Sci & Technol, Ctr Anal & Test, Shanghai 200237, Peoples R China

年份：2009

卷号：98

期号：2

起止页码：195

外文期刊名：CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS

收录：;EI(收录号：20242616434262);WOS:【SCI-EXPANDED(收录号:WOS:000270631400012)】；

基金：This work is supported by the Science and Technology Commission of Shanghai Municipality (No. 0752nm025), and is also sponsored by the Shanghai Pujiang Program.

语种：英文

外文关键词：Near-infrared spectroscopy (NIRS); Lead; Partial least squares (PLS); Enrichment

摘要：An on-line enrichment near-infrared spectroscopy (NIRS) technique was developed in order to improve the sensitivity for the determination of trace heavy metal lead. Trace Pb2+ was enriched by chelating resin with on-line enrichment equipment and then the enriched lead on the resin was directly determined by near-infrared diffuse reflectance spectroscopy without elution procedure for simplicity of measurements. Partial least squares (PLS) regression was used to build models between the corrected spectra and concentrations of Pb2+, and segmental cross-validation was used to search for a reasonable number of PLS factors. The results showed that NIR spectra and concentrations of Pb2+ had a good linear relationship with the maximum of correlation coefficient of 0.9228 in the 1006-1383 nm region. The minimum RMSEP was 0.4777 mg L-1 when the latent variable number was 5 by using the region of 1006-1383 nm. The limit of detection (LOD) of lead was 0.2384 mg L-1 in this case. This study demonstrates that the prediction of trace heavy metal lead concentrations by NIRS is feasible with enrichment technique. (c) 2009 Elsevier B.V. All rights reserved.