摘要
研究了2-（2-噻唑偶氮）-5-磺丙氨基苯酚（TASPAP）与钒（Ⅴ）的显色反应。试剂与钒（Ⅴ）在pH4.2的乙酸-乙酸钠缓冲溶液中形成稳定的紫红色络合物,λmax=570nm,V（Ⅴ）的质量浓度在0～1.75 mg/L范围内符合比尔定律,其表观摩尔吸光系数ε570=5.53×10^4L·mol^-1·cm^-1;铁的干扰可以加EDTA-Zn溶液克服。此方法可以不经分离直接测定钢样和水样中的微量钒,水样的加标回收率为98.0%～103.0%,标准钢样的测定结果与认定值一致。
The chromogenic reaction of 2- （2-thiazolylazo）-5-sulfopropylaminophenol （TASPAP） with vanadium （Ⅴ） in aqueous solution was studied. Ⅴ （Ⅴ） reacts with TASPAP to form a stable purple complex in the HAc-NaAc buffer solution at pH 4.2. The maximum absorption peak of this complex lies at 570 nm and the apparent molar absorptivity is 5.53×10^4L·mol^-1·cm^-1. Beer＇s law is obeyed in the range 0- 1.75mg of Ⅴ （Ⅴ） per litre. Fe （Ⅲ） was masked by EDTA-Zn solution. The method is highly selective and has been applied to the direct determination of vanadium in steel samples and water with the standard addition recoieries for water samples of 98.0%-102.4%, and the results for determining alloy steel samples are in agreement with certified results.
出处
《冶金分析》
CAS
CSCD
北大核心
2008年第2期44-47,共4页
Metallurgical Analysis
基金
江苏省高校自然科学研究计划资助项目(05KJB150003)
全国化工高等教育科学研究"十一五"规划立项课题(中化教协发[2007]003-33)
江苏省海洋生物技术重点建设实验室资助项目(2005HS10)
