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  • Chem Sci Trans., 2017, 6(4),  pp 646-652  

    DOI:10.7598/cst2017.1398

    Research Article

    Chelation and Stabilization Properties of Citrulline and Uracil with Hg(II) as a Heavy Metal Ion in Solution

  • MONIKA SINGH1, VIJAY SHANKAR2, DHARMVEER SINGH1 and VIJAY KRISHNA1*
  • 1Department of Chemistry, University of Allahabad, Allahabad-211002, (U.P.), India
    2Department of Chemistry, B.S. N.V. P.G. College, Lucknow -226001 (UP), India
  • Abstract

    Potentiometric studies of mercury(II) complex with amino acids and nucleobases in ternary system has been carried out in aqueous solution. The equilibrium studies of quaternary complexes Hg(II)- L-Citrulline(A)- Uracil (B) with different transition metal ions M = Cu(II), Zn(II) Co(II) and Ni(II) has been studied at temperature 37±1 oC and ionic strength I = 0.1 M NaNO3. The obtained ternary and quaternary system potentiometric data were analysed using computer program SCOGS (Stability Constant of Generalized Species). The analysed binary, ternary and quaternary species by SCOGS are shown in the species distribution curves. The protonation constant of ligands A and B and stability constants of its complexes such as MA, MB, MAB and Hg-M-AB type found to be following Irving William order. The Hg(II)-Cu(II), Hg(II)-Co(II), Hg(II)-Zn(II) and Hg(II)-Ni(II) quaternary species occurred complexing within the pH range of 3-9 and the maximum percent concentrations found to be 80, 76, 78 and 70, respectively at pH range 5- 6.

    Keywords

    Citrulline, Formation constant, Speciation curves, SCOGS, Chelation

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