Simultaneous Determination of Copper, Zinc and Lead by Adsorptive Stripping Voltammetry in the Presence of Morin
Analytica Chimica Acta 501 (2004) 119–124
Simultaneous determination of copper, zinc and lead by adsorptive stripping voltammetry in the presence of Morin
E. Shams a,∗ , A. Babaei b , M. Soltaninezhad b a Institute for Advanced Studies in Basic Sciences, Zanjan 45195-159, Iran b Department of Chemistry, Arak University, Arak, Iran
Received 24 November 2002; received in revised form 5 September 2003; accepted 15 September 2003
Abstract A sensitive and selective method for the simultaneous determination of copper, zinc and lead is presented. The method is based on the adsorptive accumulation of 2 ,3,4 ,5,7-pentahydroxyflavone (Morin) complexes of these elements onto a hanging mercury drop electrode, followed by reduction of adsorbed species by voltammetric scan using differential pulse modulation. Optimal analytical conditions were found to be Morin concentration of 2.0 M, pH of 4.0, and an adsorption potential at −500 mV versus Ag/AgCl. With an accumulation time of 60 s, the peak currents are proportional to the concentration of copper, lead and zinc over the 1 to 60, 0.3–80 and 1–70 ng ml−1 range with detection limits of 0.06, 0.08 and 0.06 ng ml−1 , respectively. The procedure was applied to the simultaneous determination of copper, lead and zinc in some real and synthetic artificial real samples with satisfactory results. © 2003 Elsevier B.V. All rights reserved.
Keywords: Copper; Zinc; Lead; Adsorptive stripping voltammetry; Morin
1. Introduction Lead, copper and zinc are environmental pollutant, which have been tested and assessed over the past few years from both the toxicological and the human health viewpoints. While slight quantities of zinc and copper are essential for normal physiological processes, their excess intake poses an important threat to human health. The maximum tolerable daily intakes for copper and zinc are 0.5 and 1.0 mg kg−1 body weight, respectively [1]. Lead is widely distributed in nature and exhibits severe deleterious
Simultaneous determination of copper, zinc and lead by adsorptive stripping voltammetry in the presence of Morin
E. Shams a,∗ , A. Babaei b , M. Soltaninezhad b a Institute for Advanced Studies in Basic Sciences, Zanjan 45195-159, Iran b Department of Chemistry, Arak University, Arak, Iran
Received 24 November 2002; received in revised form 5 September 2003; accepted 15 September 2003
Abstract A sensitive and selective method for the simultaneous determination of copper, zinc and lead is presented. The method is based on the adsorptive accumulation of 2 ,3,4 ,5,7-pentahydroxyflavone (Morin) complexes of these elements onto a hanging mercury drop electrode, followed by reduction of adsorbed species by voltammetric scan using differential pulse modulation. Optimal analytical conditions were found to be Morin concentration of 2.0 M, pH of 4.0, and an adsorption potential at −500 mV versus Ag/AgCl. With an accumulation time of 60 s, the peak currents are proportional to the concentration of copper, lead and zinc over the 1 to 60, 0.3–80 and 1–70 ng ml−1 range with detection limits of 0.06, 0.08 and 0.06 ng ml−1 , respectively. The procedure was applied to the simultaneous determination of copper, lead and zinc in some real and synthetic artificial real samples with satisfactory results. © 2003 Elsevier B.V. All rights reserved.
Keywords: Copper; Zinc; Lead; Adsorptive stripping voltammetry; Morin
1. Introduction Lead, copper and zinc are environmental pollutant, which have been tested and assessed over the past few years from both the toxicological and the human health viewpoints. While slight quantities of zinc and copper are essential for normal physiological processes, their excess intake poses an important threat to human health. The maximum tolerable daily intakes for copper and zinc are 0.5 and 1.0 mg kg−1 body weight, respectively [1]. Lead is widely distributed in nature and exhibits severe deleterious