Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (20): 2109-2114.DOI: 10.6023/A12080570 Previous Articles     Next Articles

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邵学广, 宁宇, 刘凤霞, 李积慧, 蔡文生   

  1. 南开大学化学学院 天津 300071
  • 投稿日期:2012-08-20 发布日期:2012-08-30
  • 通讯作者: 邵学广
  • 基金资助:

    项目受国家自然科学基金(No. 20835002)资助.

Application of Near-infrared Spectroscopy in Micro Inorganic Analysis

Shao Xueguang, Ning Yu, Liu Fengxia, Li Jihui, Cai Wensheng   

  1. College of Chemistry, Nankai University, Tianjin 300071
  • Received:2012-08-20 Published:2012-08-30
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No. 20835002).

Near infrared spectroscopy (NIRS) has been widely used in analyzing various real complex samples due to its superiority in fast and non-destructive determination. It is difficult, however, for the technique to analyze the components of micro-content, especially the inorganic components, because NIR spectrum contains only the weak signals of C—H, O—H and N—H, and inorganic components generally generate no response in the spectrum. In this review, the principle and applications of NIRS in analyzing inorganic components in environmental, soil, plant and bio-samples are summarized. The feasibility of applying NIRS in micro-inorganic analysis was proved by various applications of the technique in analyzing lake or river sediments, forest or farmland soils, straw, amaranth, clover, paprika, rice, wheat, meats, and sea foods. Because multivariate calibration technique is generally adopted in NIR spectral analysis, quantitative analysis can be achieved by modeling the spectral responses in which the interactions of the inorganic components and organic contents are included or by using the correlationship between the micro and macro components. However, the models must be used with care in such applications because they may fail when the predicted samples are heavily deviated from the calibration ones. Furthermore, applications of preconcentration techniques in NIR analysis are also summarized in this paper. By adsorption of an inorganic analyte onto the surface of a high efficient adsorbent from a dilute solution, the interactions between the analyte and the adsorbent can be directly measured by using NIR diffuse reflectance spectroscopy (NIRDRS), and the relationship between the contents of the analyte and the spectra can be modeled with multivariate calibration techniques. The adsorbents of functionalized resins, thiol-functionalized magnesium phyllosilicate clay, nano-hydroxyapatite, etc. have been studied for detection of micro inorganic ions in dilute solutions such as Hg2+, Ag+, Pb2+, Zn2+, Cu2+, Co2+, Ni2+, Cd2+ and Cr3+. The results of these studies showed that the adsorption can significantly improve the detection limit and fast detection can be achieved by NIRDRS measurements and multivariate calibration.

Key words: near infrared spectroscopy, micro-analysis, inorganic component, preconcentration, correlation, multivariate calibration