镍-1-(2-吡啶偶氮)-2-萘酚共沉淀分离富集碱金属盐中痕量铅及铅的原子吸收光谱测定

Separation and Enrichment of Trace Lead in Alkali Metal Salt With Nickel-1- (2-pyridylazo) -2-naphthol as Coprecipitatant and Its Application

采用Ｎｉ（Ⅱ）－１－（２－吡啶偶氮）－２－萘酚在ｐＨ ９．７溶液中共沉淀分离富集碱金属盐试剂中的痕量铅，用火焰原子吸收光谱测定，克服了基体干扰，取得了较为满意的结果。同时对共沉淀机理进行了初步的探讨，结果表明其属于吸附共沉淀类型。

A method was proposed for the determination of trace lead in alkali metal salts with flame atomic absorption spectrometry after quantitative coprecipitation of the Ph (Ⅱ) with Ni (Ⅱ)-1-(2- pyridylazo)-2-naphthol at pH 9. 7. The effect of matrix can be overcome by the method. The coprecipitation mechanism was also studied, the results showed that the process belongs to the adsorption coprecipitation.