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方法要点本文采用阳离子交换树脂使Zn~(2+)和大量CrO_4~(2-)分离,然后用适当浓度的酸溶液,将Zn~(2+)从树脂上洗脱下来,以标准EDTA溶液测定.以PAN作指示剂.试剂及装置1 离子交换装置:国产732型阳离子交换树脂10g,在10%的稀H_2SO_4中浸泡数小时,使之充分膨胀。然后取50ml酸滴定管一支,塞入玻璃纤维一小束,以防止树脂泄漏,装满蒸馏水,将处理过的树脂带水少量、少量地加入滴定管中,树脂层高约25ml,
Key points of the method In this paper, Zn 2+ and a large amount of CrO 4 2- were separated by cation exchange resin, then Zn 2+ was eluted from the resin with an appropriate concentration of acid solution, Determination of PAN as an indicator Reagents and devices 1 Ion exchange device: Domestic 732 cation exchange resin 10g, soaked in 10% dilute H 2 SO 4 for several hours to make it fully expanded. Then take a 50ml acid burette, a small bundle of glass fiber, to prevent resin leakage, filled with distilled water, the treated resin with a small amount of water, a small amount added to the burette, the resin layer height of about 25ml,