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据文献记载,1-(2-吡啶偶氮)-2-萘酚(简称PAN)已用于多种金属的光度测定,但迄今为止,尚未见用于锑的测定。 PAN与锑不能直接反应生成有色络合物。但在强酸介质中,三价锑与碘化钾及PAN能生成红色三元络合物。因为反应迅速、灵敏度高、选择性好、用有机溶剂萃取时有色络合物极稳定,可用于锑的光度测定。本文研究了萃取比色测定锑的适宜条件:如萃取酸度,试剂的用量以及干扰元素等。当用于测定矿石中微量锑时,结果良好。
According to the literature, 1- (2-pyridylazo) -2-naphthol (referred to as PAN) has been used for a variety of metals photometric determination, but so far, has not been used for the determination of antimony. PAN and antimony do not react directly to form colored complexes. However, strong acid medium, trivalent antimony and potassium iodide and PAN can generate red ternary complexes. Because of the rapid response, high sensitivity and good selectivity, the colored complex is very stable when extracted with organic solvent and can be used for photometric determination of antimony. In this paper, the extraction colorimetric determination of the appropriate conditions of antimony: such as extraction acidity, the amount of reagents and interference elements. When used in the determination of trace antimony ore, the result is good.