银盐吸收法测定砷时几种实验现象的分析

银盐吸收法测定食品中的砷，原理清楚，方法易行，准确度高。但此法所用试剂较多，测定中出现许多如溶液颜色变化的实验现象。本文就样品消化时溶液颜色的变化、加入碘化钾和氯化亚锡后溶液颜色的变化、醋酸铅棉花的颜色变化等现象加以分析。

The analysis of several experimental phenomena when to determine As with the absorption method of Ag-salt

To determine the As in the food with the absorption method of Na Salt,which has the following features:the principle is clear,the method is easily feasible,as well as the accuracy is high But the method uses more reagents than others,and many experimental phenomena such as the change of the solution color,arise during determining As This passage mainly analyses the change of the solution color when the sample dissolves or is put into KI and SnCl 2,moreover it analyses the color change of the Pb (Ac)2,and so on