Simultaneous Determination of Trace Levels of Cd(II), Cu(II), Pb(II)and Zn(II) in Water Samples by Adsorptive Stripping Voltammetry Using Calcein as a Chelating Agent

Deswati, Deswati and Munaf, Edison and Suyani, Hamzar and Zein, Rahmiana (2015) Simultaneous Determination of Trace Levels of Cd(II), Cu(II), Pb(II)and Zn(II) in Water Samples by Adsorptive Stripping Voltammetry Using Calcein as a Chelating Agent. In: 8 th International Symposium on Asia Pacific on Ion Analysis, August 31- September 3, 2015, in Makuhari MESSE Chiba Japan. (Unpublished)

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Abstract

A sensitive and selective electrochemical procedure is presented for simultaneous determination of trace levels of Cd(II), Cu(II), Pb(II) and Zn(II) in water samples with calcein as a chelating agent. The method is based on the adsorptive accumulation of the complexes of Cd(II), Cu(II), Pb(II) and Zn(II) ions with calcein onto the surface of hanging mercury drop electrode for 60 s, Then the preconcentrated metals-complexes were analyzed by adsorptive stripping differential pulsa voltammetry. The effect of various parameters such as pH, concentration of calcein, accumulation potential and accumulation time were studied. The optimum conditions for simultaneous determination of Cd(II), Cu(II), Pb(II) and Zn(II) include pH 4.0, concentration of 0.6 mmol/L calcein, accumulation potential of -0,7 V (vs. Ag/AgCl) and accumalation time of 60 s. Under the optimum conditions the measurement peak current is proportional to the concentration of Cd(II), Cu(II), Pb(II) and Zn(II) in the range 0.2 - 110 µg/L ; 0.2 – 100 µg/L ; 0.2 – 110 µg/L ; and 0.2 – 100 µg/L respevtively. The limit of detection of the method was 1.3871 µg/L for Cd(II), 0.7663 µg/L for Cu(II), 1.4372 µg/L for Pb(II) and 0.9832 µg/L for Zn(II). The relative standard deviation were 0.84%, 0.25%, 0.43% and 0.54% for Cd(II), Cu(II), Pb(II) and Zn(II) for ten replicates (n = 10) measurements of mixture solution 10 µg/L of Cd(II), Cu(II), Pb(II) and Zn(II). The method was successfully applied for simultaneous determination of Cd(II), Cu(II), Pb(II) and Zn(II) in tap, sea water and lake water samples of Maninjau Agam, West Sumatera. Keywords: trace levels, calcein, adsorptive stripping, voltammetry

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