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Complexo‐titrimetric determination of mercury using hexahydropyrimidine‐2‐thione as a selective masking agent
Author(s) -
Narayana B.,
Kuchinad T. Girish,
Gajendragad M. R.
Publication year - 1992
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19920100505
Subject(s) - chemistry , xylenol orange , masking agent , mercury (programming language) , relative standard deviation , inorganic chemistry , nitrate , nuclear chemistry , chromatography , detection limit , organic chemistry , computer science , programming language
A simple, rapid, accurate 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. Hexa hydropyrimidine‐2‐thione (HPT) 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 2–55 mg of mercury, with a relative error of less than 0.5% and standard deviation of less than 0.04.