摘要
本文通过研究Se(Ⅳ)催化氧化笨肼,进而与间苯二胺偶合生成黄色偶氮染料的最佳条件,建立测定Se的光度分析法。该染料的最大吸收波长为450nm,在此波长下的吸光度值与Se量有线性关系。表观摩尔吸光系数为3.0×10~6l·mol^(-1)·cm^(-1)。符合比尔定律的范围是0.4～32ppb,用于测定面粉及合成样中Se的回收实验均得到满意的结果。
A new sensitive catalytic method for spectrophotometric determining traces 6f selenium(Ⅳ) is proposed. Selenium catalyzes the oxidation of phenylhydrazine by potassium chlorate to diazobenzene, which then is converted to a yellow azo dye by coupling with m-phenylenediamine. Their absorption maxima are 450nm. Optimum conditions for determining selenium have been established. The sensitivity presented as apparent molar absorptivity equals to 3.0×106. Beer's law is obeyed in the concentration range of 0.4ppb-32ppb. The method is sensitive and simple. By means of this catalytic reaction, submicrogram amounts of selenium can be easily determined. The mechanism of activation is investigated.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1990年第6期659-662,共4页
Acta Scientiarum Naturalium Universitatis Pekinensis
关键词
硒
催化光度法
催化分析
测定
Selenium determination
Catalytic analysis
Spectrophotometry
