1引言近年来，NaSCN在部分地区可用作生牛乳的保鲜剂，它在制品中残留过多会对人的健康产生危害。作者在前人研究的基础上，以银基汞膜等组成的三电极系统测定奶粉中疏氰化合物，结果满意。该法具有简便快速、灵敏度高、选择性好，样品可不经前处理而直接测定的特点。2实验部分 1 Introduction In recent years, NaSCN can be used as a preservative for raw milk in some areas. Too much residue in the product may harm human health. On the basis of the previous studies, the authors determined the cyanide compounds in milk powder by a three-electrode system consisting of silver-based mercury films and the like, with satisfactory results. The method is simple, rapid, high sensitivity, good selectivity, the sample can be directly measured without prior processing characteristics. 2 experimental part