title: Chemometrics-assisted simultaneous determination of cobalt(II) and chromium(III) with flow-injection chemiluminescence method.
abstract: In this paper, a flow-injection chemiluminescence (CL) system is proposed for simultaneous determination of Co(II) and Cr(III) with partial least squares calibration. This method is based on the fact that both Co(II) and Cr(III) catalyze the luminol-H(2)O(2) CL reaction, and that their catalytic activities are significantly different on the same reaction condition. The CL intensity of Co(II) and Cr(III) was measured and recorded at different pH of reaction medium, and the obtained data were processed by the chemometric approach of partial least squares. The experimental calibration set was composed with nine sample solutions using orthogonal calibration design for two component mixtures. The calibration curve was linear over the concentration range of 2 x 10(-7) to 8 x 10(-10) and 2 x 10(-6) to 4 x 10(-9) g/ml for Co(II) and Cr(III), respectively. The proposed method offers the potential advantages of high sensitivity, simplicity and rapidity for Co(II) and Cr(III) determination, and was successfully applied to the simultaneous determination of both analytes in real water sample.
authors.affiliation: Department of Chemistry, School of Chemistry and Materials Sciences, Shaanxi Normal University, Xi'an 710062, PR China. libx29@hotmail.com
authors.forename: Baoxin
authors.initials: B
authors.lastname: Li
authors.forename: Dongmei
authors.initials: D
authors.lastname: Wang
authors.forename: Jiagen
authors.initials: J
authors.lastname: Lv
authors.forename: Zhujun
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D002138:Calibration; D002857:Chromium / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry; D017022:Flow Injection Analysis / Q000379:methods*; D006861:Hydrogen Peroxide / Q000737:chemistry; D008163:Luminescent Measurements / Q000379:methods*; D008165:Luminol / Q000737:chemistry; D015999:Multivariate Analysis; D012680:Sensitivity and Specificity
chemical_list: D002857:Chromium; D003035:Cobalt; D008165:Luminol; D004492:Edetic Acid; D006861:Hydrogen Peroxide