文献类型：期刊文献

英文题名：Improving the sensitivity of NIR spectroscopy with an enrichment technique: Determining a trace analyte of ethyl carbamate

作者：Wei, Xuemei[1]; Huang, Zixia[1]; Zhang, Wei[1]; Du, Yiping[1]

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

年份：2007

卷号：23

期号：7

起止页码：853

外文期刊名：ANALYTICAL SCIENCES

收录：;EI(收录号：20191506753629);WOS:【SCI-EXPANDED(收录号:WOS:000248110800017)】；

语种：英文

外文关键词：Infrared devices - Near infrared spectroscopy - Mean square error

摘要：An exploration was made to develop a determination method of a low-concentration analyte by NIR spectroscopy. An absorber, silica gel was employed to extract and enrich a low-concentration analyte of ethyl carbamate. The solid absorber with the enriched analyte was measured by NIR spectroscopy in the range of 800 - 2500 nm. Afterwards, PLS regression was performed between the NIR spectra and the concentrations of the analyte for quantitative analysis of the low-concentration analyte. The spectra of 20 solid samples of analyte-absorbed silica gel showed a good correlation with the concentrations of ethyl carbamate in the samples. A leave-one-out cross validation was applied to evaluate the prediction ability of PLS models built with the full spectra, spectra in the region of 1920 - 1970 nm and the region of 2250 - 2430 nm, respectively. The values of the root-mean-square error of the cross validation (RMSECV) were about 0.1 in L-1 (0.1 ppm).