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DBC-偶氮胂是光度法测定稀土的显色剂,用该试剂直接光度法测定有色合金中锆也已作了研究,而DBC-偶氮胂与铅的显色反应至今未见文献报道。本文研究了该显色反应,发现DBC-偶氮胂与铅在盐酸(0.1mol·L~(-1))介质中可形成稳定的紫红色络合物,最大吸收峰为618.2nm,表观摩尔吸光系数为3.0×10~4试剂与络合物稳定,铅在0～15μg/25ml范围内呈线性关系,我们用该试剂直接光度法测定了铅黄铜和粗铜中铅,分析方法简单、快速,应用效果令人满意。试验部分
DBC-arsenazo is a chromogenic reagent for the determination of rare earths by spectrophotometry. The determination of zirconium in non-ferrous alloys using this reagent has also been studied. The chromogenic reaction of DBC-arsenazo with lead has not been reported until now. In this paper, the color reaction was studied. It was found that DBC-arsenazo and lead can form a stable fuchsine complex in hydrochloric acid (0.1 mol·L -1) medium with a maximum absorption peak of 618.2 nm. The extinction coefficient is 3.0 × 10 ~ 4 The stability of the reagent and the complex, the lead in the range of 0 ~ 15μg / 25ml linear relationship, we use the reagent direct photometric determination of lead brass and blister copper, the analysis method is simple , Fast, satisfactory results. Experimental part