摘要
研究了偶氮胂Ⅲ、二溴硝基偶氮胂和二溴羧基偶氮胂3种偶氮胂类试剂与Cr_2O_7^(2-)的褪色反应.发现它们在硝酸介质中具有高灵敏的褪色反应,摩尔吸光系数均达1×10~5L·mol^(-1)·cm^(-1)以上,是目前光度法测定Cr(Ⅵ)灵敏度最高的方法之一.可用于水中铬的测定.
The decolorization of arsennazo group reagents such as arsenazo Ⅲ, dibromoriitroarsenazo anddibromocarboxyarsenazo with Cr2O72- were studied. In the medium of nitric acid, the reactions have high sensibility. The molar absorptivities of all the reactions are more than 1.0 - 105. So a new method for determining trace chromium is developed, which is the one of the most sensitive method. It has been used to the determination of chromium in water and alloy steel.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1999年第11期1309-1312,共4页
Chinese Journal of Analytical Chemistry
关键词
分光光度法
褪色反应
铬
偶氮胂类试剂
测定
Spectrophotometry, decolorization, chromium( Ⅵ) , arsennazo group reagents
