壳聚糖修饰电极超声辅助电化学测定碘离子

采用滴涂法制备壳聚糖修饰玻碳电极,运用线性扫描溶出伏安法和差分脉冲伏安法测定水中的I-。研究了修饰液的浓度、底液的pH、扫描速度、富集时间及超声对电化学行为的影响。线性扫描溶出伏安法对水中的I-的检出限为1.8×10-5mol·L-1,差分脉冲伏安法检出限可达4.0×10-10mol·L-1,采用超声辅助伏安法能够进一步提高检测的灵敏度,建立了一种快速检测水中微量I-的方法。

Determination of Iodine Ion with Chitosan Modified Electrode Ultrasonics-assisted Electrochemical

Chitosan-modified glassy carbon electrode was prepared by drop coating.The iodine ion was determined by using linear sweep stripping voltammetry and differential pulse voltammetry.Several factors,such as the concentration of modifying liquid,the pH of sulfuric acid,scan rate,accumulation time and ultrasonic,affected the electrochemical were studied.Under the optimum conditions,the linear sweep stripping voltammetry was 1.8×10^-5 mol·L^-1,while differential pulse voltammetry was 4.0×10^-10 mol·L^-1.Ultrasonics enhanced the sensitivity of the detection of iodine ion.A rapid and effective method was developed to detect the trace iodine ion in water.