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电解液中锑、铋通常以沉淀法富集分离后,用碘化钾光度法测定铋;用结晶紫萃取光度法测定锑,方法不甚简便。锑、铋与碘化钾和硫脲均能生成黄色络合物,可用作各自的光度法测定,但两元素相互干扰严重。我们考察了酸度对锑、铋与碘化钾和硫脲络合物显色的影响。试验结果如图所示,铋络合物显色不受酸度影响,而锑络合物显色则明显受酸度影响。在
Antimony and bismuth in the electrolyte are usually separated and precipitated by precipitation method, and bismuth is determined by potassium iodide photometric method. The determination of antimony by crystal violet extraction spectrophotometry is not simple and convenient. Antimony, bismuth with potassium iodide and thiourea can generate yellow complexes, can be used as their own spectrophotometric determination, but the two elements interfere with each other seriously. We examined the effect of acidity on the color development of antimony, bismuth and potassium iodide and thiourea complexes. As shown in the experimental results, the color of the bismuth complex is not affected by the acidity, whereas the color of the antimony complex is significantly affected by the acidity. in