摘要
本文研究了新显色剂二溴邻羧基苯基重氮氨基偶氮苯与Zn(Ⅱ)的显色反应.结果表明:在TritonX-100存在下,于pH10.5的Na_2B_4O_7—NaOH缓冲介质中,试剂与Zn(Ⅱ)生成稳定的红色配合物,其最大吸收波长在530nm处,摩尔吸光系数为1.94×10~5.锌量在0～8μg/25ml范围内符合比尔定律.干扰离子采用阴离子交换树脂分离,用于铝合金中微量锌的测定,结果令人满意.
The color reaction of dibromo-o-carboxybenzenediazoaminoazobeazene ( DB-o-CDAA ) with zinc ( Ⅱ ) has been studied. In the presence of Triton X-100 and at pH 10.5 borax buffer solution,Zn forms a stable red complex with the reagent. The complex of zinc(Ⅱ)has maximum absorption at 530am and the molar absorptivity is 1.94×108. Beer's law is obeyed in the range of 0-8ug Zn( Ⅱ ) per 25 ml. The interfering ions are separated by anionic exchange resin. The method has been used to determine trace Zn in aluminium alloys with satisfactory results.
出处
《冶金分析》
CAS
CSCD
北大核心
1993年第1期18-20,共3页
Metallurgical Analysis
基金
煤炭青年科学基金资助课题
关键词
锌
铝合金
比色法
显色剂
Dibromo-o-carboxybenzenediazoaminoazobenzene, Speetrophotometric analysis, Zinc, Aluminium alloy
