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对于铑的测定,高含量多用重量法,常采用的有硫代巴比土酸,哌啶二硫代甲酸钠,硝酸六氨合正钴等作沉淀剂,但手续都较麻烦,费时.直接比色法测定误差又较大.应用差示分光光度法在适当的条件下,测量高浓度元素,相对误差可以降低到百分之一以下,能同重量法和容量法相比.这种方法对于贵金属铂、铑的测定,已于近年来开始了研究与应用.苯—2—砷酸钠—[1—偶氮—1]—2—羟基萘—3.6—二磺酸钠(即钍试剂),是一种偶氮染料型的试剂,在水中溶解度很大,且相当稳定.Sangal等利用此试剂分光光度法测定了钍、铀、镧、钌、钯等元素.钍试剂与铑的详细研究,国内外文献资料未见有报导.因此,我们选了该试剂用差示分光光度法测定铑.用于活性炭中催化剂铑的测定获得了满意的结果.
For the determination of rhodium, high content of multi-use weight method, often used thiobarbituric acid, piperidine dithiocarbamate, ammonium nitrate hexamine cobalt as a precipitating agent, but the procedures are more cumbersome and time-consuming. Direct ratio Colorimetric determination of errors and larger.Using differential spectrophotometry in appropriate conditions, the measurement of high concentrations of elements, the relative error can be reduced to less than one percent, with the weight method and capacity method compared to this method for the precious metals Platinum and rhodium have been studied and applied in recent years. Sodium benzene- 2-arsenate - [1-azo-1] -2-hydroxynaphthalene-3.6- disulfonate (ie, thorium reagent) Is an azo dye-type reagent that is highly soluble in water and quite stable.Sangal et al use this reagent spectrophotometric determination of thorium, uranium, lanthanum, ruthenium, palladium and other elements thorium reagents and rhodium detailed study, Therefore, we chose this reagent to determine rhodium by differential spectrophotometry.We obtained satisfactory results for the determination of rhodium catalyst in activated carbon.