摘要
2,6,7-三羟基-9-[4-(8-羟基与喹啉)-偶氮基)苯基]萤光酮,简称-HQA-PF,是一种新显色剂。-HQA-PF在弱酸性介质中,有表面活性剂CPB存在下,与Sb(Ⅱ)形成稳定的三元络合物,其最大波长在562nm处,锑量在0.5～9pg/25ml范围符合比耳定律,求算表观摩尔吸光系数ε＇_(562)=2.55×10~5L·mol^(-1)·cm^(-1),用双峰双波长法测定,相应的表观摩尔吸光系数ε＇_(562-504)=3.34×10~5L·mol^(-1)·cm^(-1),较单波长法提高约30％。用拟定的实验方法,进行化探样品中痕量锑的测定,结果满意。
A highly sensitive colour reaction of Sb with the title reagent and CPB has been studied. The complex is formed at pH 5.0～6.0 with stable time of 6h, the apparent molar absorptivity is 2.55×10~5 L·mol^(-1)·cm^(-1) at 562nm and 3.34×10~5 L.mol^(-1).cm^(-1) by dual—wavelength measurement. Beer's law is obeyed from 0.5 to 9μg/25 ml for Sb. The method has been used for the determination of trace Sb with satisfactory results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1992年第7期765-768,共4页
Chinese Journal of Analytical Chemistry
关键词
锑
分光光度法
HQA-PF
2, 6, 7-Trihydroxy-9-〔4-(8-hydroxy-5-quinolylazo)phenyl〕fluorone
Spectrophoto-metry
Antimony.
