线性扫描吸附伏安法测定食品中痕量氟

报道了食品中氟的线性扫描溶出伏安法测定 .在 p H=4 .9的 0 .0 2 mol/L六次甲基四胺的缓冲溶液中 ,铈 -茜素络合剂 -氟的络合物产生一灵敏的阴极峰 ,峰电位为 -0 .85V( vs.SCE) ,峰高与 F- 浓度在 2 .0× 1 0 - 8～ 4 .0× 1 0 - 7mol/L范围内呈线性关系 ,检出限为 1 .0× 1 0 - 8mol/L .该法用于食品中的痕量氟的测定 ,结果满意 .另外 ,对峰电流的性质和电极反应的机理进行了研究

Determination of trace fluoride in foods using linear sweep adsorptive stripping voltammetry

This paper reports the determination of fluoride in food by linear sweep stripping voltammetry. In the buffer solution of (CH2)6N4 at pH=4.9, a sensitive adsorptive complex wave of cerium(Ⅲ)-alizarin complexone-fluoride can be obtained by linear sweep stripping voltammetry. The peak potential appears at -0.8　V(vs. SCE). The peak height is proportional to the concentration of fluoride over the range of 2.0×10-8～4.0×10-7　mol/L. The detection limit is 1.0×10-8　mol/L. The method has been used for the determination of fluoride in food with satisfactory results.This paper also studies the characteristics of the peak current and mechanism of the electrode process.