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在pH 7.50的醋酸铵缓冲溶液中,8—羟基喹啉与Ni(Ⅱ)、Cu(Ⅱ)、Pb(Ⅱ)和 Cd(Ⅱ)形成的络合物在—0.38、—0.52、—0.62和—0.80V处呈现灵敏的吸附阴极溶出伏安波。用1.5次微分,当富集时间为2min时,Ni(Ⅱ) 、Cu(Ⅱ)、Pb(Ⅱ)和Cd(Ⅱ)含量分别在5.0 ×10~(-10)～3.0×10~(-7)、3.0×10~(-10)～5.0×10~(-8)、8.0×10~(-11)～1.0×10~(-7)和2.0×10~(-11)～1.0×10~(-7)mol·L~(-1)范围内,峰高与金属离子浓度呈良好的线性关系,检测下限分别达3.0×10~(-10)、1.0×10~(-10)、5.0×10~(-11)和1.0×10~(-11)mol·L~(-1)。本法可测定茶叶和人发中痕量镍、铜、铅及镉,结果满意。
The complex formed between 8-hydroxyquinoline and Ni (Ⅱ), Cu (Ⅱ), Pb (Ⅱ) and Cd (Ⅱ) in the buffer solution of ammonium acetate at pH 7.50 is at -0.38, -0.52, -0.62 and -0.80V showed sensitive adsorption cathodic stripping voltammetry. With the 1.5th derivative, the content of Ni (Ⅱ), Cu (Ⅱ), Pb (Ⅱ) and Cd (Ⅱ) in the range of 5.0 × 10 -10 ~ 3.0 × 10 ~ 3.0 × 10 -10 -5.0 × 10 -8, 8.0 × 10 11 -1.0 × 10 -7, and 2.0 × 10 -1 -1.0 × In the range of 10 ~ (-7) mol·L ~ (-1), the peak height and the metal ion concentration showed a good linear relationship with the detection limits of 3.0 × 10 -10 and 1.0 × 10 -10, respectively. , 5.0 × 10 ~ (-11) and 1.0 × 10 ~ (-11) mol·L -1, respectively. This method can be determined in tea and human hair trace nickel, copper, lead and cadmium, with satisfactory results.