Citation: Jie Wang, Wu Yang, Jie Ren, Miao Guo, Xiao Dong Chen, Wen Bin Wang, Jin Zhang Gao. Trace determination of cobalt ion by using malic acid-malonic acid double substrate oscillating chemical system[J]. Chinese Chemical Letters, ;2008, 19(9): 1103-1107. doi: 10.1016/j.cclet.2008.06.012 shu

Trace determination of cobalt ion by using malic acid-malonic acid double substrate oscillating chemical system

College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, China

Received Date: 26 March 2008

Fund Project: Authors are grateful to the Project of International Cooperation between China and Ukraine (No. 043-05), National Natural Science Foundation and Key Lab of Polymer Materials of Gansu Province for their financial supports.

A novel kinetic method for determination of trace amounts of cobalt ion was proposed and validated. The method is based on adding malic acid into classical Belousov-Zhabotinskii (B-Z) oscillating chemical system to form a double substrate one. The results showed that when the concentration of cobalt ion was in the range of 5.27×10^-8 to 5.37×10^-12mol L^-1 the change of the oscillating period was directly proportional to the negative logarithm of cobalt ion concentration. The sensitivity and precision of the developed method were quite satisfactory. The limit of detection was down to 5.20×10^-13mol L^-1 which was a highest sensitivity found for determination of metal ions using oscillating chemical reaction so far. Some factors influencing the determination were also examined. The method has been successfully used to determine cobalt ion in vitamin B12 injection.
- Two substrate oscillating chemical system,
- Malic acid,
- Cobalt,
- Determination
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