新银盐比色法快速测定化妆品中砷元素

Rapidly Detecting Arsenic in Cosmetic by Colorimetry with New Silver Salt

利用硼氢化钾片将化妆品中的砷元素还原为砷化氢 ,以新银盐为显色液 ,用便携式测砷仪快速测定化妆品中砷元素。其中 Sb、Bi、Se等元素用二甲基甲酰胺消除。该有色物的最大吸收峰在 40 0 nm处 ,检出下限为 0 .3 3× 1 0 -6,回收率大于 95 % ,且快速简便 。

Arsenic in cosmetic can be reduced by KBH 4 to form AsH 3,which can react with new silver salt to form a colored product.The whole processes can be rapidly fulfilled in a set of instrument called Portable Arsenic Monitor.The interference of Sb,bi,Se can be eliminated by DMF.The maximum absorbency gives out at 400 nm.The lowest liner range of the method is about 0.033 ppm and the recovery rate is over 95%.The method is simple,fast and can meet the requirements of the measurement.