International Journal of Chemical Studies
Vol. 3, Issue 1 (2015)
Indirect complexometric determination of Mercury(II) using L-Cystine as a selective masking agent
Author(s): Nagaraj P., Gopalakrishna Bhat N., Chandrashekara K.G.
Abstract: A complexometric method for the determination of mercury in the presence of other metal ions based on the selective masking ability of L-Cystine towards mercury is described. Mercury(II) present in a given sample solution is complexed with a known excess of EDTA and surplus EDTA was titrated against lead nitrate solution at pH 5-6 using xylenol orange as the indicator. A known excess of 0.02M solution of L-Cystine is then added. The mixture is then shaken well and the EDTA released from Hg-EDTA complex was titrated against the standard lead nitrate solution. Reproducible and accurate results were obtained for 4.18–83.6 mg of mercury(II) with relative error ≤ 0.23 % and standard deviations ≤ 0.04 mg. The interference of various ions is studied. This method was applied to the determination of mercury(II) in its synthetic mixtures of ions, alloys and complexes.
Pages: 27-29 | 1303 Views 20 Downloads
How to cite this article:
Nagaraj P., Gopalakrishna Bhat N., Chandrashekara K.G.. Indirect complexometric determination of Mercury(II) using L-Cystine as a selective masking agent. Int J Chem Stud 2015;3(1):27-29.