摘要
研究了在阳离子型微乳液：CTMAB／n－C5H11OH-n－C7H16／H2O介质中，Pb（Ⅱ）－5’-硝基水杨基荧光酮（5’－NSF）的显色反应。在oH9．0NH3·H2O-NH4Cl缓冲体系中，Pb（Ⅱ）与5’－NSF形成1：2紫色络合物，ε575=1．14×105L·mol－1·cm－1，Pb（Ⅱ）浓度在0－0．52mg／L范围内服从比尔定律。方法用于样品中微量铅的测定，结果令人满意。
The chromogenic reaction of lead (Ⅱ)-5'-nitrosalicylfluorone (Pb (Ⅱ) -5' - NSF) in cationicmicroemulsion cetyltrimethylammonium bromide (CTMAB)/n-C5H11, OH/n-C7H16/H2O medium was studied. In the NH3·H2O-NH4Cl(pH 9.0) buffer solution, lead reacts with 5'-NSF to form a 1: 2 complex. The maxinum absorption is at 575 nm and the molar absorptivity is 1. 14×105L·mol-1·cm-1.Beer's law is obeyed in the ragne of 0 ~ 0. 52 mg/L for Pb(Ⅱ). The mehtod has been applied to the determination of lead in the toothpaste, hair and food with satisfactory results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2000年第5期597-600,共4页
Chinese Journal of Analytical Chemistry
关键词
铅
硝基水杨基荧光酮
分光光度法
测定
Lead,microemulsion, 5'-nitrosalicylfluorone, spectrophotomery
