Citation: Wei DENG, Wei Ping YANG, Zhu Jun ZHANG, Xiao Rong LI. Improvement on Simultaneous Determination of Cr(Ⅲ) and Cr(VI) by Capillary Electrophoresis and Chemiluminescence Detection[J]. Chinese Chemical Letters, ;2003, 14(3): 287-289. shu

Improvement on Simultaneous Determination of Cr(Ⅲ) and Cr(VI) by Capillary Electrophoresis and Chemiluminescence Detection

College of Chemistry and Materials Science, Shanxi Normal University, Xi'an 710062

Received Date: 23 May 2002

Fund Project: This study was supported by the National Natural Science Foundation of China (No. 20175039).

A sensitive method for the simultaneous determination of Cr(Ⅲ) and Cr(VI) using in-capillary reaction capillary electrophoresis separation and chemiluminescence detection was developed. The procedures were designed as follows:The sample, hydrochloric acid and sodium hydrogen sulfite solution segments were injected sequentially into the capillary. The reaction of Cr(VI) reduced to Cr(Ⅲ) by HSO₃^- occurred inside the capillary after applying the running voltage. According to the migration time difference of both Cr(Ⅲ) ions moving towards to the cathode (detection end), they could be separated and determined. The limits of detection for chromium(Ⅲ) and chromium(VI) (S/N=3) were 6.0×10^-13 mol/L (12 zmol) and 1.9×10^-11 mol/L (380 zmol), respectively.
- Chemiluminescence,
- in-capillary reaction,
- chromium,
- capillary electrophoresis
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