Determination of EDTA species in water by square-wave voltammetry using a chitosan-coated glassy carbon electrode.
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.
Zhao
Changzhi
C
State Key Laboratory of Fine Chemicals, Dalian University of Technology, 158-40 Zhongshan Rd., 116012 Dalian, China. zhaoch@online.in.cn
Pan
Yuzhen
Y
Su
Yan
Y
Zhang
Zhihui
Z
Guo
Zhen
Z
Sun
Licheng
L
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
D002614:Chelating Agents; D002686:Chitin; D002244:Carbon; D048271:Chitosan; D004492:Edetic Acid