丁二酮肟修饰玻碳电极差分脉冲溶出伏安法测量痕量镉

以丁二酮肟作为修饰剂制备化学修饰电极，用于痕量镉的伏安法测定．研究了支持电解质种类及酸度、修饰膜厚度、富集电位、富集时间、扫描速度等因素对伏安曲线的影响，获得较为优化的测试条件，在0．1mo/L HAc—NaAc缓冲溶液（pH=4．0）中，ca（Ⅱ）的浓度在2．0×10^-9moL／L-2．0×10^-6 moL／L范围内与它的氧化峰电流呈良好线性关系，检测限达2．0×10^-9 moL／L．该电极具有很好的重现性．在含4．0×10^-7moL／Lcd（n）试液中连续测定10次，其RSD为7．8％．本法用于环境污水样（咸宁市咸安区的西河水）测定，获得满意的结果．

Diacetyldioxime Rebound Qualifying Promote Carbon Electrode Measurement Trace Cadmium by Differential Pulse Stripping Voltammetry

The glassy carbon electrode modified with diacetyldioxime was used to determine trace Cd（Ⅱ）by differential pulse stripping voltammetry. The effect of the type and acidity of electrolytes,the thickness of Diacetyldioxime membranes,accumulation - potential,accumulation time,scan rate on the response of Cd（II）were investigated to acquire optimum conditions. In 0. 1 mol/L pH = 4.0 HAc - NaAc buffer,there was an excellent linearity between oxidation current and concentration of Cd（Ⅱ） in the range from 2.0 × 10^-9 mol/L to 2.0 × 10^-6 mol/L with a detection limit of 2.0 × 10^-9 mol/L. The electrode had very good repeatability. Its relative standard deviation （RSD） obtained from 10 continuous determinations of the same solution containing 4.0 × 10^-7 mol/L Cd（Ⅱ） was 7.8%. This method was used to determine water samples （Xianning City Xianan area of the West river measurements） with satisfactory results.