ORIENTAL JOURNAL OF CHEMISTRY www.orientjchem.org An International Open Free Access, Peer Reviewed Research Journal ISSN: 0970-020 X CODEN: OJCHEG 2018, Vol. 34, No.(1): Pg. 100-109 Comparative Evaluation of Trace Heavy Metal Ions in Water Sample Using Complexes of Dithioligands by Flame Atomic Absorption Spectrometry VINAY KUMAR MAURYA, RAVI PRATAP SINGH and LAL BAHADUR PRASAD* Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi- 221005, India. *Corresponding author E-mail: lbprasad@bhu.ac.in http://dx.doi.org/10.13005/ojc/340111 (Received: November 03, 2017; Accepted: December 15, 2017) ABSTRACT Four new complexes were prepared by the metathetic reaction of trace heavy metals like Cd, Zn, Cu and Hg with two different dithioligands of the formula ML 2 [ M= Cd, Zn, Cu and Hg and L= potassium-1,1-dicyano-2,2-ethylenedithiolate and potassium N-4-fluorobenzyl, N butyldithiocarbamate ] and characterized by elemental analysis, IR, UV-visible, 1 H, 13 C NMR and AAS. Atomic Absorption Spectrophotometric measurements revealed that the N- substituted dithiocarbamate ligand are more effective. Removal efficiency of heavy metals than carbon substituted dithiocarbamate ligand. Molar ratio studies show that the complexes have the formula ML 2 . Solvent extraction measurement indicates that after the extraction of heavy metal in water phase and their dithiocarbamate complexes are completely dissolved in organic phase and are totally separated from aqueous solution. Keywords: Atomic Absorption Spectrometry, Dithiocarbamate, Heavy Metal, Removal Efficiency, Polluted Water. INTRODUCTION Dithiocarbamate functional group is a versatile ligating moiety and readily interacts with a verity of metal ions to form complexes with varying nuclearities 1 . They have wide range of application in medicinal chemistry, industrial chemistry, rubber technology 2-6 and several carbon substituted and N-substituted dithiocarbamate complexes used in agrochemicals due to their high efficiency for fungal diseases 7-10 and adopt various coordination modes such as asymmetric and symmetric chelating, bridging and rarely monodentate in their complexes, the most common binding mode is chelating. The dithiocarbamate ligands show ability to stabilized high formal oxidation states of the metals and metal dithiocomplexes exhibits interesting magnetic and optical properties 11-12 . This is an Open Access article licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License (https://creativecommons.org/licenses/by-nc-sa/4.0/ ), which permits unrestricted NonCommercial use, distribution and reproduction in any medium, provided the original work is properly cited.