Determination of cobalt in biological materials by RNAA via induced short-lived 60mCo |
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Authors: | Ur?ka Repinc Ljudmila Benedik Boris Pihlar |
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Institution: | (1) Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Materials Science, Shaanxi Normal University, Xi’an, P.R. China;(2) Department of Chemistry, Institute of Analytical Science, Southwest University, Beibei, Chongqing, P.R. China |
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Abstract: | A chemiluminescence (CL) micro-flow system is presented for rapid determination of chemical oxygen demand (COD) in water at
room temperature. In this system, potassium dichromate is reduced to Cr3+ in 2 mol L−1 H2SO4 during the chemical oxidation of COD substances in the sample, and Cr3+ can be measured with the help of the luminol-H2O2 CL system. The polymethyl methacrylate micro-flow chip with discrete microdroplet sampling was used here. Effects on COD
determination (such as pH, concentrations, the channel length, and interference) were investigated. The linear range for COD
determination was 0.27–10 g L−1, and the detection limit was 100 mg L−1. The method was successfully applied to the determination of COD in wastewater samples. The data obtained with the present
method were in fairly good agreement with those obtained by the titrimetric method.
Correspondence: Zhujun Zhang, Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry
and Materials Science, Shaanxi Normal University, Xi’an 710062, P.R. China; Department of Chemistry, Institute of Analytical
Science, Southwest University, Beibei, Chongqing 400715, P.R. China |
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Keywords: | : Chemiluminescence micro-flow system chemical oxygen demand potassium dichromate |
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