论文部分内容阅读
在pH 2.0的KCl-HCl缓冲溶液中,硒(Ⅳ)与镁试剂I和十二烷基苯磺酸钠(SDBS)反形成三元络合物,使镁试剂I褪色,据此建立了褪色光度法测定硒的新方法。最大褪色波长为452 nm。体系的褪色程度与硒(Ⅳ)浓度在0.01~0.12μg/mL范围呈线性关系,检出限为1.9μg/L。测定2.5μg硒(Ⅳ)时,0.1 mg Fe3+、Cr2O72-,0.05 mg MnO4-和大量的常见离子可允许存在,因此一般样品可以不经分离直接测定。方法用于硫酸厂和电厂废水中硒的测定,相对标准偏差小于1.8%(n=5),加标回收率分别为99%和103%。
Selenium (IV) forms a ternary complex with magnesium reagent I and sodium dodecylbenzenesulfonate (SDBS) in a KCl-HCl buffer solution at pH 2.0 to discolor magnesium reagent I, thereby establishing a fade Spectrophotometric Determination of Selenium New Method. The maximum fading wavelength is 452 nm. The degree of discoloration of the system was linear with the concentration of selenium (Ⅳ) in the range of 0.01-0.12 μg / mL with the detection limit of 1.9 μg / L. Determination of 2.5μg of selenium (Ⅳ), 0.1mg Fe3 +, Cr2O72-, 0.05mg MnO4- and a large number of common ions can be allowed to exist, so the general sample can be measured directly without isolation. The method was applied to the determination of selenium in wastewater from sulfuric acid plants and power plants. The relative standard deviations (RSDs) were less than 1.8% (n = 5). The recoveries were 99% and 103%, respectively.