Development of quinhydrone electrode in chloroform. Application to the determination of equilibrium constants of acid—base reactions and potentiometric titration of some amine drugs

Pournaghi-Azar, M.H.; Ordoukhanian, Juliet

doi:10.1016/0039-9140(93)e0035-c

Cited by 5 publications

(1 citation statement)

References 4 publications

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“…Only Cd 2 þ , Pb 2 þ , and Fe 3 þ seriously interfered for determination of uranium. Thus, to eliminate the interference of Cd 2 þ , Pb 2 þ , and Fe 3 þ , the EDTA was used as a masking agent Pournaghi-Azar and Ordoukhanian 1991), which does form a complex with Cd 2 þ , Pb 2 þ , and Fe 3 þ , and a remarkable improvement in the tolerance for Cd 2 þ , Pb 2 þ , and Fe 3 þ was achieved Pournaghi-Azar and Ordoukhanian 1991;Hirano et al 2003).…”

Section: Adsorptive Stripping Voltammetry 1137mentioning

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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Section: Adsorptive Stripping Voltammetry 1137mentioning

confidence: 99%