福美双的极谱催化波的检测方法

Study on the polarographic catalytic wave of thiram

研究了酒石酸-酒石酸钾钠-K2S2O8体系中福美双的极谱催化波，拟定了测定福美双的新方法。结果表明：在0．2mol·L^-1酒石酸-酒石酸钾钠（pH5．5）＋1．5×10^-3mol·L^-1K2S2O8底液中，极谱催化波峰电位EP=-0．5V（vs．SCE）；二阶导数峰峰电流Ip″与福美双浓度在5．0×10^-8～3．0×10^-6mol·L^-1范围内呈良好的线性关系，检出限为1．0×10^-8mol·L^-1，相对标准偏差为1．27％（n=11）。福美双催化波灵敏度比相应的福美双还原波高25倍，对样品的平均检测回收率为90．29％～96．10％，该方法灵敏、简单、快速。

A novel method of the determination of thiram was proposed based on its polarographic catalytic wave in the presence of persulfate. In 0. 2 mol · L^-1 C4H6O6 - C4H4O6 KNa （pH 5.5 ） ＋ 1.5 × 10^-3 mol· L^-1 K2S2O8 base solution, the peak potential of the polarographic catalytic wave was at - 0. 5 V （ vs. SCE）, and the 2nd-order derivative peak current of the catalytic wave was linearly proportional to the thiram concentration in the range of 5.0×10^-8～3.0×10^-6mol·L^-1 . The detection limit was 1.0×10^-8mol·L^-1 , and the relative standard deviations was 1.27% （n = 11 ）. The sensitivity of the catalytic wave of thiram was 25 times higher than that of the corresponding reduction wave. The recovery was between 90. 29% - 96. 10% in detection samples. The method was sensitive, simple, rapid.