极谱催化波法连续测定锌、铁、锰、铜、铅、镉

CONTINUOUS DETERMINATION OF Zn, Fe, Mn, Cu, Pb, AND Cd WITH POLAROGRAPHIC CATALYTIC METHOD

以乙二胺和8-羟基哇啉为底液,用极谱催化液法连续测定人参三宝口服液和生物样品中Zn、Fe、Mn、Cu、Pb、Cd含量,方法具有灵敏度高,选择性好,操作简便,快速、准确等优点。六种元素的导数峰电位依次为-1.45V、-1.66V、-1.76V、-0.61V、-0.74V、-0.94V。波高和浓度线性范围依次为0～5ppm、0～5ppm、0～5ppm、0～3ppm、0～4ppm。六种元素测定下限均为2ppb,采用标准加入法对同一样品进行7次测定,回收率分别为98.7％,103.3％、104.5％、104.2％、95.0％、95.0％,变异系数为6.0～10.0％。

The contents of 6 trace elements in 'Ginseng Three-treasure' oral liquid and biological sample were determined with polarographic catalytic method by use of the solution of ethylenediamine and 8-hydroxyquinoline (pH11.50-12.00) as medium. The peak potentials of Zn, Fe, Mn, Cu, Pb,and Cd were -1.45V,-1.66V,-1.7GV, -0.61V,-0.74V, and-0.94V, respectively and the peak heihgts were linearly proportional to the concentration over a range of 0-5ppm,0-5ppm, 0-5ppm, 0-3ppm, 0-4ppm,and 0-6ppm respectively. The lower limit for determination of all the six trace elements was 2ppb. The recovery rates were 98.7%, 103.3%, 104.5%, 104.8%, 95.0% and 95.0% and the coefficient of variation was 5.8-10.0%. This method was accurate and suitable for operation.