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Quantitative Analysis of Chromium(VI) in Dilute Solution by Using Adsorption and Diffuse Reflectance Near‐infrared Spectroscopy
Author(s) -
Shao Xueguang,
Chen Nan,
Cai Wensheng
Publication year - 2010
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201090335
Subject(s) - chemistry , adsorption , chromium , analyte , diffuse reflectance infrared fourier transform , analytical chemistry (journal) , sorbent , aqueous solution , diffuse reflection , matrix (chemical analysis) , partial least squares regression , infrared spectroscopy , calibration , chromatography , optics , organic chemistry , physics , statistics , mathematics , photocatalysis , catalysis
A method for quantitative determination of metal element in aqueous solution was developed by using adsorption and diffuse reflectance near‐infrared spectroscopy (DRNIRS). In this method, the analyte is firstly adsorbed onto the resin from the dilute solution, and then the adsorbed analyte is directly determined in the sorbent by using DRNIRS. Enrichment of the analyte is achieved by the adsorption from the dilute solution, and quantitative determination is accomplished by using multivariate calibration technique. Taking chromium(VI) in river water as the analytical target, adsorption conditions and the partial least squares (PLS) model was optimized. The results show that chromium(VI) can be immobilized onto the adsorbent and quantitatively measured by DRNIRS and multivariate calibration. With cross validation and external validation, the correlation coefficient between the reference and predicted concentration was found to be above 0.98 in the range of 0.75–29.90 mg·L −1 for the PLS model, and the interference of the coexisting matrix was eliminated with the aid of multivariate calibration.