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作者曾撰写过苯甲酰苯胲(BPHA)螯合试剂的综述;对其与锡的螯合反应亦作过初步研究,证实 BPHA 不能将锡(Ⅳ)还原至锡(Ⅱ),仅能促使锡(Ⅱ)被空气中氧所氧化,而形成锡(Ⅳ)的螯合物沉淀,与文献报导的试验结果一致。Ryan 曾利用这一反应定量沉淀锡,但此沉淀须在冰浴中陈化四小时才能过滤,操作费时、又不方便。本文研究在室温下,锡(Ⅳ)-BPHA 螯合物的沉淀条件,试验确认,当以乙酸代替乙醇作 BPHA 的溶剂,在1.5N 酸度条件下
The authors have reviewed the chelating agents benzoyl benzene (BPHA); its chelation reaction with tin also made a preliminary study confirmed that BPHA tin (Ⅳ) can not be reduced to tin (Ⅱ), only to promote Tin (Ⅱ) is oxidized by oxygen in the air to form a chelate precipitate of tin (Ⅳ), which is consistent with the experimental results reported in the literature. Ryan used this reaction to quantify the amount of tin that was precipitated, but the precipitate had to be aged in an ice bath for four hours before being filtered, which was time consuming and inconvenient. In this paper, the precipitation conditions of tin (Ⅳ) -BPHA chelate were studied at room temperature. It was confirmed by experiments that when acetic acid was used instead of ethanol as BPHA solvent,