摘要
通过偶联反应首次合成出新试剂2-(4-安替比林偶氮)-5-二甲氨基苯胺(AADMAA)。本文报告了AA-DMAA的合成、鉴定、酸离解常数的测定和它与Cu(Ⅱ)的显色反应的研究。在pH3时,AADMAA与Cu(Ⅱ)形成1:1的红色络合物,λ_(max)=495nm,ε=2.86×10~4,铜量在0～40μg/25ml内符合比尔定律。加入适当掩蔽剂,可以不经分离直接测定某些物料中的微量铜。
A new reagent AADMAA was synthesized. The acid dissociation constant of AADMAA was determined by spectrophotometry. At pH 3, Cu (Ⅱ) forms a red complex with AADMAA. The maximum absorbance was measured at 495 nm. The complex ratio of Cu ( Ⅱ) and AADMAA is 1:1. The molar absorptivity is 2.86x104, Beer's law is obeyed for 1-40g Cu(Ⅱ)/25ml. The selectivity of method is high. The method has been used to directly determine trace copper in some materials when proper masking agents were added.
出处
《冶金分析》
CAS
CSCD
北大核心
1989年第5期4-7,共4页
Metallurgical Analysis
