Thermodynamic Studies on the Complexation of Cobalt(II) with Dopamine in a Cosolvent System

Bagheri, A.; Boghaei, Davar M.

doi:10.1007/s10953-007-9137-2

Cited by 6 publications

(6 citation statements)

References 14 publications

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“…Levodpa (LDOPA) with phenolic, amine, and carboxylic groups has a capacity to coordinate with some metal ions and produce a chelate ring. Recently the dopamine derivatives were used in equilibrium and structure studies with Al 3þ and Si 4þ [41], Co 2þ [42], Fe 3þ and Cu 2þ [43], UO 2þ 2 [23], Pb 2þ and Zn 2þ [44,45] ions. In preliminary experiments, it was found that the addition of some equivalent of uranium or cadmium at a fixed ionic strength of 0.1 M ammonia buffer (pH 9.6) resulted in a fast change in the spectrum of the LDOPA.…”

Section: Spectrophotometric Titration Of Ldopa With Cadmium and Uranimentioning

confidence: 99%

Simultaneous Determination of Ultra Trace of Uranium and Cadmium by Adsorptive Cathodic Stripping Voltammetry Using H‐Point Standard Addition Method

Ahmadi

2010

Electroanalysis

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A sensitive adsorptive cathodic stripping voltammetry with H-point standard addition method for simultaneous determination of uranium and cadmium has been developed. The trace amounts of these metal ions can be simultaneously determined using the Levodpa as complexing agent. Optimal conditions were: accumulation time 50 s, accumulation potential 0.0 mV, scan rate 40 mV s À1 , supporting electrolyte 0.1 M ammonium buffer pH 9.6, and 1 Â 10 À5 M of Levodopa. The results revealed that the cadmium and uranium could be simultaneously determined by Hpoint standard addition method with different concentration ratios of uranium to cadmium. The method was successfully applied in a several of real samples.

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Section: Spectrophotometric Titration Of Ldopa With Cadmium and Uranimentioning

confidence: 99%

Simultaneous Determination of Ultra Trace of Uranium and Cadmium by Adsorptive Cathodic Stripping Voltammetry Using H‐Point Standard Addition Method

Ahmadi

2010

Electroanalysis

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“…They were used in equilibrium and structure studies of Al(III), silicon(IV) [17]; Co(II) [18], Fe(III) and Cu(II) [19]. In order to determined the stoichiometry of the resulting carbidopa complexes with lead and zinc ions in aqueous solutions the spectra of a series of solutions containing a constant concentration of ligand (50 mM) at a fixed ionic strength of 0.01 M ammonia buffer (pH 8.5), at 25 8C and varying amounts of the metal ions were obtained and the results are shown in Figure 2.…”

Section: Spectrophotometric Study Of Interaction Of Lead and Zinc Witmentioning

confidence: 99%

Adsorptive Stripping Voltammetric Determination of Ultra Trace of Zinc and Lead with Carbidopa as Complexing Agent in Food and Water Samples

Gholivand

Ahmadi

Sohrabi³

2007

Electroanalysis

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In the present work, the cathodic stripping voltammetric methodology using a hanging mercury drop electrode was described for simultaneous determination of lead and zinc in different real samples. The method is based on adsorption of metal ions on mercury electrode using carbidopa as a suitable complexing agent. The potential was scanned to the negative direction and the differential pulse stripping voltammograms were recorded. Optimal conditions were found to be: accumulation time; 70 s, accumulation potential; 50 mV versus Ag/AgCl, scan rate; 40 mV s À1, supporting electrolyte; 0.01 M ammonia buffer at pH 8.5, and concentration of carbidopa; 8.0 mM. The relationship between the peak current versus concentration was linear over the range of 0.1 -210 and 0.2 -170 nM for lead and zinc, respectively. The detection limits are 0.09 and 0.15 nM for lead and zinc ions respectively. The relative standard deviations at a concentration level of 70 nM of both metal ions are found 1.08 and 1.24% for lead and zinc ions respectively.

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“…Recently the dopamine derivatives were used in equilibrium and structure studies of Al(III), silicon(IV) (Sedeh et al 1993), Co(II) (Bagheri and Boghaei 2007), Fe(III), and Cu(II) (Mohamed et al 2004). In addition, we used carbidopa as a complexing reagent for determination of ultra trace of Pb 2 þ ions in different samples by adsorptive stripping voltammetry method (Hosseinzadeh et al 2007).…”

Section: Resultsmentioning

confidence: 99%

Determination of Ultra Trace Amounts of Uranium (VI) by Adsorptive Stripping Voltammetry Using L-3-(3, 4-dihydroxy phenyl) Alanine as a Selective Complexing Agent

et al. 2008

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The spectrophotometric behavior of uranium (VI) with L-3-(3, 4-dihydroxy phenyl) alanine (LDOPA) reagent revealed that the uranium can form a ML 2 complex with LDOPA in solution. Thus a highly sensitive adsorptive stripping voltammetric protocol for measuring of trace uranium, in which the preconcentration was achieved by adsorption of the uranium-LDOPA complex at hanging mercury drop electrode (HMDE), is described. Optimal conditions were found to be a 0.02 M ammonium buffer (pH 9.5) containing 2.0 Â 10 À5 M (LDOPA), an accumulation potential of À0.1 V (versus Ag=AgCl) and an accumulation time of 120 sec.The peak current and concentration of uranium accorded with linear relationship in the range of 0.5-300 ng ml À1 . The relative standard deviation (at 10 ng ml À1 ) is 3.6% and the detection limit is 0.27 ng ml À1 . The interference of some common ions was studied. Applicability to different real samples is illustrated. The attractive behavior of this reagent holds great promise for routine environmental and industrial monitoring of uranium.

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Thermodynamic Studies on the Complexation of Cobalt(II) with Dopamine in a Cosolvent System

Cited by 6 publications

References 14 publications

Simultaneous Determination of Ultra Trace of Uranium and Cadmium by Adsorptive Cathodic Stripping Voltammetry Using H‐Point Standard Addition Method

Simultaneous Determination of Ultra Trace of Uranium and Cadmium by Adsorptive Cathodic Stripping Voltammetry Using H‐Point Standard Addition Method

Adsorptive Stripping Voltammetric Determination of Ultra Trace of Zinc and Lead with Carbidopa as Complexing Agent in Food and Water Samples

Determination of Ultra Trace Amounts of Uranium (VI) by Adsorptive Stripping Voltammetry Using L-3-(3, 4-dihydroxy phenyl) Alanine as a Selective Complexing Agent

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