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Vol.2 , No. 3, Publication Date: May 6, 2015, Page: 37-46
, Ca(II), Cd(II), Co(II), Cu(II), Fe(III), Mg(II), Ni(II), Pb(II) and Zn(II) ions were studied using potentiometric technique. The association constant (Ka) of HQ was calculated from the average number of protons attached per repeating unit in the HQ (nA) at different pH values. This value of pKa which formed was found to be 6.75.The titration curves revealed that the metal ion replaces protons and coordinates to HQ. In addition, the use of such titration curves could be computed of the formation constants (log ) of the different species exist at equilibrium. The formation constant (log ) for different molar ratios of species such as 1 : 2, 1 : 1 and 2 : 1 for metal : 8-quilonol, in solution were computed and the results were discussed. The value of ń and PL for the metal ions under investigation were calculated at different pH values. The Formation Constant (log ) of the coordinated 8-quilonol based on HQ–Metal ion were computed using ń– PL system. Mathematical calculations of differential change of ń (ń) gave a sharp signal for calculations of formation constant. From ń there are partial formation constant (log 2, log 3, log 4and log 5) which indicate to the protonation degree. The analyses of potentiometric data helped us to determine each value of the formation constant and/or partial formation constant for the metal ions such as: Al(III), Ca(II), Cd(II), Cu(II), Co(II), Fe(III), Mg(II), Ni(II), Pb(II) and Zn(II) coordinated with 8- Hydroxyquinoline.&picture=http://www.aascit.org/aascit/decorators/img/journal/905.jpg)
| [1] | Mohamed M. Shahata, Environmental affairs Department, Assiut University Hospitals, Assiut University, Assiut, Egypt. |
The association equilibria of HQ and HQ–coordinated with some transition metal cations such as: Al(III), Ca(II), Cd(II), Co(II), Cu(II), Fe(III), Mg(II), Ni(II), Pb(II) and Zn(II) ions were studied using potentiometric technique. The association constant (Ka) of HQ was calculated from the average number of protons attached per repeating unit in the HQ (nA) at different pH values. This value of pKa which formed was found to be 6.75.The titration curves revealed that the metal ion replaces protons and coordinates to HQ. In addition, the use of such titration curves could be computed of the formation constants (log ) of the different species exist at equilibrium. The formation constant (log ) for different molar ratios of species such as 1 : 2, 1 : 1 and 2 : 1 for metal : 8-quilonol, in solution were computed and the results were discussed. The value of ń and PL for the metal ions under investigation were calculated at different pH values. The Formation Constant (log ) of the coordinated 8-quilonol based on HQ–Metal ion were computed using ń– PL system. Mathematical calculations of differential change of ń (ń) gave a sharp signal for calculations of formation constant. From ń there are partial formation constant (log 2, log 3, log 4and log 5) which indicate to the protonation degree. The analyses of potentiometric data helped us to determine each value of the formation constant and/or partial formation constant for the metal ions such as: Al(III), Ca(II), Cd(II), Cu(II), Co(II), Fe(III), Mg(II), Ni(II), Pb(II) and Zn(II) coordinated with 8- Hydroxyquinoline.
Keywords
8-Hydroxyquinoline, Potentiometric, Formation Constant, Heavy Metal Ions
Reference
| [01] | Legget, D. J. (1985). Computational methods for the determination of formation constants, Plenum Press, New York,. |
| [02] | Martell, A. E. and Motekaitis, R. J.( 1988). VCH, New York. |
| [03] | Ravichandiran, V., Devarajan, V., Masilamani, K.(2011). Determination of ionization constant (pka) for poorly soluble drugs by using surfactants: a novel approach. Der Pharmacia Lettre, 3 (4)183-192. |
| [04] | Macca, C. (1990). Linearized multiple standard additions for the potentiometric determination of weak acids. Talanta, 37, 1141-1149. |
| [05] | Blanco, M., Coello, J., Gonzalez, F., Iturriaga, H. and Maspoch, S.(1989). Simultaneous determination of metal ions: Spectrophotometric determination of binary, ternary and quaternary mixtures of aluminium, iron, copper, titanium and nickel by extraction with 8-hydroxyquinoline. Anal. Chim. Acta, 226, 271–279. |
| [06] | Xun-Cheng Su, Zhi-Fen Zhou and Hua-Kuan Lin.(2001). Novel 8-hydroxyquinoline substituted open chain dioxotetraamine and its metal complexes: Synthesis and property studies in aqueous solution. Indian Journal of Chemistry, 40 A, 533–537. |
| [07] | Stevenson, R. L. and Freiser, H.(1976). Tridentate ligands derived from substitution in the methyl group of 8-hydroxyquinaldine. Anal. Chem., 39(12), 1354- 1358. |
| [08] | Laurih. J. Lajunen, Roberto Portanov, Juha Piispanen and Marlena Tolazzi.(1997).Hydroxycarboxylic acid complexes with protons and metal ions and the accompanying enthalpy changes- Part I: Aromatic ortho-Hydroxycarboxylic acid. Pure &Appl. Chem., Vol. 69, No. 2, 329-381. |
| [09] | Catherine Morlay, Monique Cromer, Yolande Mouginot and Olivier Vittori. (1999). Potentiometric study of Cd(II) and Pb(II) complexation with two high molecular weight poly(acrylic acids); comparison with Cu(II) and Ni(II). Talanta, 48, 1159–1166. |
| [10] | Douheret, G. (1975). Medium effects in aqueous organic solvents. Influence of solute on transfer parameters. Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 61(2), 228–232. |
| [11] | Abd El Wahed, M.G., El Manakhly, K.A., El Kososy, N. (1995). Physicochemical studies of hydroxyquinoline sulfonic acid and its transition metal complexes. Materials Chemistry and Physics 41, 117-122. |
| [12] | Askar, E.I., Shokry, H., Al. Hashmy, D.,(2010). Potentiometric and conductometric studies of malonyl bis(salicyloylhydrazone) and divalent metal complexes. Journal of Saudi Chemical Society, 14, 175–182. |
| [13] | Hamid Reza Rajabi, Marzieyeh Sadat. Niband. (2008). Potentiometric study of binary complexes of methyl 2-pyridyl ketone oxime, phenyl 2-pyridyl ketone oxime and diacetyl monooxime with some transition and heavy metal ions in aqueous solution. Spectro chimica Acta Part A 71, 655–662. |
| [14] | Mohamed M. Shahata, Determination of the Formation Constants of Some Metal Ions Coordinated with poly (8–Hydroxyquinoline). International Journal of Advanced Research (2014), Volume 2, Issue 6, 96-109 |
| [15] | Mostafa M. Kamal, Seddique M. Ahmed, Mohamed M. Shahata and Yassien M. Temerk. (2002). Differential Pulse Polarographic (DPP) of Poly (8–Hydroxyquinoline) Matrix. Anal. and Bioanal. Chem., 372, 843 – 848. |
| [16] | Ahmed, Seddique M., Shahata, Mohamed M., Kamal, Mostafa M.(2003). Spectrophotometric Studies of the Coordination polymers Based on Poly(8-Hydroxyquinoline) Matrix. J. Inorg. Organomet. Polym. 13, 171- 192. |
| [17] | Kamal, Mostafa M., El- Sayed, Abd El-Aziz Y., Ahmed, Seddique M., Omran, Ahmed I., Shahata, Mohamed M.(2009). Cation exchange mobility on Poly(8-hydroxyquinoline) matrix. J. Inorg. Organomet. Polym. 19, 501- 506. |
| [18] | Mohammed. M. Shahata, Seddique. M. Ahmed and Mostafa M. Kamal. (2013). Cathodic Stripping Differential Pulse Voltammetric Determination of Poly(8–Hydroxyquinoline) Matrix. IJPAC-International Journal of Pure and Applied Chemistry, 8 (3), 209-216. |
| [19] | Britton, H.T.S. (1952). “Hydrogen Ions” Fourth Edition. |
| [20] | Vogel A. I. (1989). Text book of quantitative inorganic analysis, 5th edn. EIBS – Longman. London, p. 326. |
| [21] | Carlo Macca and Merkoci. (1994). Potentiometric characterization of weak acids by multiple sample addition—I. Linear equations and intrinsic performance of the method. Talanta, 41, (12), 2033–2042. |
| [22] | Irving, H. and Rossotti, H. S. (1954). The calculation of formation curves of metal complexes from pH titration curves in mixed solvents. J. Chem. Soc., 2904- 2910. |
| [23] | Alessandro De Roberties, Concetta De Stefano, Antonio Gianguzza and Silvio Sammartano. (1999). Binding of polyanions by biogenic amines III Formation and stability of protonated spermidine and spermine complexes with carboxylic ligands. Talanta, 48, 119–126. |
