Analytical Sciences

Abstract − Analytical Sciences, 19(4), 607 (2003).

Determination of EDTA Species in Water by Second-Derivative Square-Wave Voltammetry Using a Chitosan-Coated Glassy Carbon Electrode
Changzhi ZHAO,*  Yuzhen PAN,* Chunxiang HE,** Zhen GUO,* and Licheng SUN* 
*State Key Laboratory of Fine Chemicals, Dalian University of Technology, 158-40 Zhongshan Rd., Dalian 116012, China
**Department of Chemistry, Liaoning Normal University, 580 Huanghe Rd., Dalian 116029, China
Based on the adsorption of Fe(EDTA)- on a chitosan-coated glassy carbon electrode, a second-derivative square-wave voltammetry for the determination of the EDTA species in water samples was investigated. The measuring range of EDTA was from 6.0 x 10-7 to 5.0 x 10-5 mol/L with a correlation coefficient of 0.998 and a detection limit of 2.8 x10-7 mol/L. The relative standard deviation was less than 6.2% (n = 5) and the recovery was in the range of 98 - 105% for the determination of practical samples. The result was consistent with that from the HPLC method.