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提出以硫脲作掩蔽剂选择络合滴定钯的一种方法。加入过量的EDTA,而过剩的EDTA在pH=5～5.5下以二甲酚橙作指示剂,用硝酸铅进行返滴。然后加入硫脲分解钯—EDTA络合物,释放出的EDTA再用硝酸铅返滴。曾研究了各种阳离子的干扰影响。
A method of selecting complexed titration palladium with thiourea as masking agent is proposed. Excess EDTA is added and the excess EDTA is back-dripped with lead nitrate at pH = 5.5-5 using xylenol orange as an indicator. Thiourea is then added to decompose the palladium-EDTA complex, and the released EDTA is returned to the droplet with lead nitrate. Have studied the interference effects of various cations.