Among amino acids, arginine is important in human physiology because it plays an important role in cardiovascular and depression problems. In this paper the behavior of arginine as a ligand toward cadmium(II) [Cd(II)] in two different ionic media: 1.00 mol center dot dm(-3) NaCl and NaClO4, is studied. Knowledge of the species formed between Cd(II) and arginine in a wide concentration range is useful also in biology. This system was investigated using two different methods in two ranges of hydrogen ion concentration. In acidic solutions, electromotive force measurements are performed using glass and Cd amalgam electrodes. In basic solutions, polarography was used and the shift of the half wave potential was measured as a function of the ligand concentration. The experimental data obtained in NaCl solutions are explained by assuming the formation of the species [CdL], [CdHL], [CdL2], [CdHL2] and [CdH2L2]. The data obtained in NaClO4 solutions are explained by assuming the formation of the species [CdL], [CdHL], and [CdH2L2]. In both cases the stability constants are reported.

An Investigation of Complexation of Cadmium(II) with Arginine / Bottari, Emilio Giovanni; Festa, Maria Rosa; Gentile, Lorella. - In: JOURNAL OF SOLUTION CHEMISTRY. - ISSN 0095-9782. - STAMPA. - 42:4(2013), pp. 823-840. [10.1007/s10953-013-9988-7]

An Investigation of Complexation of Cadmium(II) with Arginine

BOTTARI, Emilio Giovanni;FESTA, Maria Rosa;GENTILE, LORELLA
2013

Abstract

Among amino acids, arginine is important in human physiology because it plays an important role in cardiovascular and depression problems. In this paper the behavior of arginine as a ligand toward cadmium(II) [Cd(II)] in two different ionic media: 1.00 mol center dot dm(-3) NaCl and NaClO4, is studied. Knowledge of the species formed between Cd(II) and arginine in a wide concentration range is useful also in biology. This system was investigated using two different methods in two ranges of hydrogen ion concentration. In acidic solutions, electromotive force measurements are performed using glass and Cd amalgam electrodes. In basic solutions, polarography was used and the shift of the half wave potential was measured as a function of the ligand concentration. The experimental data obtained in NaCl solutions are explained by assuming the formation of the species [CdL], [CdHL], [CdL2], [CdHL2] and [CdH2L2]. The data obtained in NaClO4 solutions are explained by assuming the formation of the species [CdL], [CdHL], and [CdH2L2]. In both cases the stability constants are reported.
2013
arginine; cadmium(ii) complexes; polarography; potentiometry
01 Pubblicazione su rivista::01a Articolo in rivista
An Investigation of Complexation of Cadmium(II) with Arginine / Bottari, Emilio Giovanni; Festa, Maria Rosa; Gentile, Lorella. - In: JOURNAL OF SOLUTION CHEMISTRY. - ISSN 0095-9782. - STAMPA. - 42:4(2013), pp. 823-840. [10.1007/s10953-013-9988-7]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/516525
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