丝网印刷微电极测定水中痕量铅的差分脉冲伏安法研究  

Determination of Trace Lead in Purified Water with Screen-Printed Electrodes

作　　者：张君[1] 袁倬斌[1] 

机构地区：[1]中国科学院研究生院化学与化学工程学院

出　　处：《分析化学》2006年第1期47-51,共5页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No.20175025);国家黎基金分析化学重点基金(No.20235010);电分析化学国家重点实验室基金;"十五"科技攻关重大项目(No.2001BA210A04-7)资助

摘　　要：研究了用一次性丝网印刷膜片式微电极，通过阴极富集-阳极溶出差分脉冲伏安法测定水中Ph^2＋含量的方法。实验详细考察了电极预处理方式的选择；电极的使用次数、缓冲溶液浓度的确定；缓冲溶液的pH值、电压范围以及扫描速度对峰电流的影响；差分脉冲伏安法中各参数的选择等。实验结果表明：在pH=3．60的1．00×10^-4mol／L的醋酸-醋酸钾缓冲溶液中，-1．1V富集10s后，溶出峰电流与Pb^2＋浓度在0-1000μg/L范围内呈线性关系，相关系数r=0．9959；在实际样品测量中。回收率在89．9％～103％之间；相对标准偏差为4．84％。A method using cathode deposition-anode stripping differential pulse voltammetry for determination of trace Pb^2＋ in purified water with screen-printed electrodes used only once was described. Several factors effect such as pretreatment of electrodes, use times of screen-printed electrodes, concentration and pH of buffer solution, scan ranges and scan rates of cyclic voharnmetry, and other parameters of electrochemistry were discussed. The result showed that the calibration plot was linear in the range of 0 - 1000μg/L with regression coefficient of 0. 9959 under the optimal analytical conditions i. e. cathodic depositing 10 s at -1.1 V in pH = 3.60, 1.00 × 10^-4 mol/L acetic acid and potassium acetate buffer. The recovery of Pb^2＋ is between 89.9% and 103% for purified water in market, and the reahive standard deviation is4.8%.

关 键 词：丝网印刷 微电极 铅 电化学 差分脉冲伏安法 

分 类 号：O657.1[理学—分析化学]