摘要
二甲酚橙是微量分析中一种很重要的光度显色剂，在pH6．0的磷酸-醋酸-硼酸缓冲溶液中，二甲酚橙与铅形成稳定的1：1红色配合物，导致吸光度的增强。研究了铅与三苯甲烷类染料二甲酚橙的显色反应体系，发现在波长580nm处吸光度的增强值与铅的加入量有很好的线性关系，据此建立了测定微量铅的新方法。该方法的摩尔吸光数为3．312×10^4L/（mol·cm），铅离子的浓度在0．075—1．2mg／L范围内符合比耳定律。方法简便、灵敏、选择性好，可广泛应用。
Xylenol orange is a very important developer in mieroanalysis. Pb^2＋ Can react with XO to form a stable 1 ： 1 complex of red color in Britton-Robinson buffer of pH 6.0. Chromogenic reaction of Pb^2＋ -xylenol orange system was studied and a new spectrophotometric method for determining trace lead was established. The results showed that the maximum absorption wavelength is 580 nm. The apparent molar absorption coefficient is 3. 312 × 10^4 L/（ mol · cm）. As the Pb^2＋ concentration is in the range of 0. 075 × 1.2 mg/L, it follows the Beer＇ s Law. The method had several advantages such as few procedures, mild reaction conditions easy operation, low contamination and high yield of product. The method can generally to be used.
出处
《应用化工》
CAS
CSCD
2009年第2期296-299,共4页
Applied Chemical Industry
基金
国家自然科学基金资助项目(20877038)
湖南省自然科学基金(03JJY3030)
关键词
分光光度法
二甲酚橙
铅
speetrophotometry
xylenol orange
Pb （ Ⅱ ）
