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本文以8—羟基喹啉碳糊修饰电极为工作电极,以 KCl、KCl—酒石酸氢钾和 KCl—酒石酸氢钾—二甲酚橙为底液,用阴极溶出伏安法连续测定发样中的铜、锌、铊的含量,在选定的条件下浓度与峰高的线性关系依次为1.5×10~(-9)—1.5×10~(-6),3.8×10~(-8)～7.5×10~(-6),5×10~(-9)～2×10~(-7)mol/L,方法具有较高的灵敏度。采用标准加入法对同一样品进行7次测定,回收率分别为98.87%、96.95%、97.64%,变异系数为7.50%、6.89%、6.65%。
In this paper, 8-hydroxyquinoline carbon paste modified electrode as the working electrode, with KCl, KCl-potassium bitartrate and KCl-potassium hydrogen tartarate-xylenol orange as the bottom liquid, cathodic stripping voltammetry continuous determination of hair samples The linear relationship between the concentrations of copper, zinc and thallium under the selected conditions was 1.5 × 10 -9 -1.5 × 10 -6, 3.8 × 10 -8 ~ 7.5 × 10 ~ (-6), 5 × 10 ~ (-9) ~ 2 × 10 ~ (-7) mol / L, the method has high sensitivity. The standard addition method was used to determine the same sample seven times. The recoveries were 98.87%, 96.95% and 97.64%, respectively. The coefficients of variation were 7.50%, 6.89% and 6.65% respectively.