以2-咪唑烷硫酮作为选择性掩蔽剂络合滴定法测定汞（II）
Complexometric determination of mercury(II) with 2-imidazolidinethione as a selective masking agent.
作者信息
Narayana B, Gajendragad M R
机构信息
Department of Post-Graduate Studies and Research in Chemistry, Mangalore University, Mangalagangothri 574 199, Karnataka, India.
出版信息
Talanta. 1988 Sep;35(9):719-20. doi: 10.1016/0039-9140(88)80167-x.
A simple, rapid and selective complexometric method is proposed for the determination of mercury(II). Mercury(II) is first complexed with a known excess of EDTA and the surplus EDTA is back-titrated at pH 5.0-6.0 with lead nitrate, Xylenol Orange being used as indicator. 2-Imidazolidinethione is then added to displace EDTA from the Hg-EDTA complex quantitatively and the EDTA released is titrated with lead nitrate. Reproducible and accurate results are obtained for 2-75 mg of mercury, with a relative error of less than 0.3% and standard deviation of less than 0.04 mg.
提出了一种简单、快速且具有选择性的络合滴定法测定汞（II）。首先使汞（II）与已知过量的乙二胺四乙酸（EDTA）络合，然后在pH 5.0 - 6.0条件下用硝酸铅回滴定剩余的EDTA，二甲酚橙用作指示剂。接着加入2 - 咪唑烷硫酮以定量地从汞 - EDTA络合物中置换出EDTA，释放出的EDTA用硝酸铅滴定。对于2 - 75毫克的汞，可获得重现性好且准确的结果，相对误差小于0.3%，标准偏差小于0.04毫克。
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