title: Determination of EDTA species in water by square-wave voltammetry using a chitosan-coated glassy carbon electrode.
abstract: The electrochemical behavior of Fe(EDTA)(-/2-) on a chitosan-coated glassy carbon electrode (GCE) and the determining method of the EDTA species in water samples by square-wave voltammetry (SWV) have been investigated. Fe(EDTA)(-) can be adsorbed on the positively charged chitosan membrane assembled on a GCE and be reduced at a potential of -0.095V vs. Ag/AgCl. On the chitosan-coated GCE, the cathodic stripping peak current is proportional to the concentration of EDTA after the operating parameters of SWV were optimized. The measuring range of EDTA was from 2.0x10(-6) to 8.0x10(-5)mol/L with a correlation coefficient of r=0.998 and a detection limit of 2.0x10(-7)mol/L. The relative standard deviation was less than 6.4% (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.
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, 158-40 Zhongshan Rd., 116012 Dalian, China. zhaoch@online.in.cn
authors.forename: Changzhi
authors.initials: C
authors.lastname: Zhao
authors.forename: Yuzhen
authors.initials: Y
authors.lastname: Pan
authors.forename: Yan
authors.initials: Y
authors.lastname: Su
authors.forename: Zhihui
authors.initials: Z
authors.lastname: Zhang
authors.forename: Zhen
authors.initials: Z
authors.lastname: Guo
authors.forename: Licheng
authors.initials: L
authors.lastname: Sun
mesh_terms: D002244:Carbon / Q000737:chemistry; D002614:Chelating Agents / Q000032:analysis* / Q000737:chemistry; D002686:Chitin / Q000031:analogs & derivatives* / Q000737:chemistry*; D048271:Chitosan; D002851:Chromatography, High Pressure Liquid; D004492:Edetic Acid / Q000032:analysis* / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D012680:Sensitivity and Specificity
chemical_list: D002614:Chelating Agents; D002686:Chitin; D002244:Carbon; D048271:Chitosan; D004492:Edetic Acid