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      Mechanistic Study and Kinetic Determination of Cu (II) by the Catalytic Kinetic Spectrophotometric Method

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          A highly sensitive and selective catalytic kinetic spectrophotometric method for the determination of Cu (II) is proposed. It is based on the catalytic effect of Cu (II) on the oxidation of glutathione (GSH) by potassium hexacyanoferrate (III) in acidic medium at 25.0℃. The reaction is monitored spectrophotometrically by measuring the decrease in absorbance of oxidant at 420 nm using the fix-time method. Under the optimum conditions, the proposed method allows the determination of Cu (II) in a range of 0 - 35.0 ng mL −1 with good precision and accuracy and the limit of detection is down to 0.04 ng mL −1. The relative standard deviation (RSD) is 1.02%. The reaction orders with respect to each reagent are found to be 1, 1/2, and 1/2 for potassium hexacyanoferrate (III), glutathione and Cu (II) respectively. On the basis of these values, the rate equation is obtained and the possible mechanism is established. Moreover, few anions and cations can interfere with the determination of Cu (II). The new proposed method can be successfully used to the determination of Cu (II) in fresh water samples and seawater samples. It is found that the proposed method has fairly good selectivity, high sensitivity, good repeatability, simplicity and rapidity.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          10 January 2019
          01 February 2019
          : 18
          : 1
          : 144-150
          1 The Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
          2 Qingdao Economy & Technology Development Zone, Huangdao of Qingdao Supervision & Institute of Product Quality, Qingdao 266555, China
          Author notes
          *Corresponding author: JI Hongwei
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2019.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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