摘要
研究了偶氮氯膦-Ⅲ与铅的显色反应,在稀盐酸介质中,铅与偶氮氯膦-Ⅲ形成了1:2的紫色配合物,最大吸收波长为650nm,铅含量在0～15μg/25ml的范围内符合比耳定律,表观摩尔吸光系数为ε=5.7×104L·mol-1·cm-1。应用于市售茶叶中微量铅的测定,获得了较为满意的结果。
The color reaction between Pb2+and CPA-Ⅲ was studied. In the medium of 0.2mol/L HCl, lead could form a violet-red complex with CPA-Ⅲ. The maximum absorption of the complex occurred at 650nm .The apparent molar absorptivity was 5.7×104L·mol-1·cm-1, and Beer's law was obeyed in the range of 0～15μg(Pb)/25ml. This method has been applied to determinate trace lead in cosmetics and water successfully.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2002年第9期93-96,共4页
Food Science
