Der Pharma Chemica
Journal for Medicinal Chemistry, Pharmaceutical Chemistry, Pharmaceutical Sciences and Computational Chemistry
ISSN: 0975-413X
Abstract
Spectrophotometric determination of Mercury in environmental samples using 5-methylthiophene-2-carboxaldehyde ethylenediamine (MTCED)
Author(s): K. Deepa, Y. Paul Raj, Y. LingappaA simple, rapid and sensitive spectrophotometric method was developed for the determination of Hg (II) using 5- methylthiophene–2-carboxaldehyde ethylenediamine (MTCED) as an analytical reagent. The reagent has been synthesized and characterized using IR, 1H NMR and Mass spectral data. The metal ion in aqueous medium forms light yellow colored complex with MTCED at (pH = 2.0) (sodium acetate-hydrochloric acid buffer solution) showing maximum absorbance at 385 nm. Hence, analytical studies were further carried out at 385 nm. The reagent reacts with mercury in acidic medium to form light yellow colored 1:1 (M:L) complex. The color reactions are instantaneous and absorbance values remain constant for 24 hours. The composition of the Hg (II) complex with MTCED was studied by the method of Job’s continuous variation and molar ratio method. Beer’s law was obeyed in the range of 0.83-8.6 μg ml−1of Hg (II). The molar absorptivity and sandell’s sensitivity of the method were found to be 5.58 x 104 Lmol-1cm-1 and 0.00179 μg/ cm-2 respectively. Since MTCED method is more sensitive, it was applied for the determination of mercury in environmental samples.
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