SIMULTANEOUS DETERMINATION OF CADMIUM, COPPER AND LEAD IN SEA WATER BY ADSORPTIVE STRIPPING VOLTAMMETRY IN THE PRESENCE OF CALCON AS A COMPLEXING AGENT

Abstract

A selective and sensitive adsorptive stripping voltammetric (AdSV) procedure for the simultaneous determination of cadmium, copper and lead in the sea water was conducted. The aim of this research is to get optimum condition for simultaneous determination of cadmium, copper and lead. Adsorptive stripping voltammetry has been used for determination of trace amount of Cd(II), Cu(lI) and Pb (II) by using calcon as a complexing agent. The parameters studied were variation of calcon concentration, pH, accumulation potential and accumulation time. In this study, the optimum conditions were calcon concentration of 0.6 mM, pH = 4.0, accumulation potential of -0.7 V and accumulation time of 80 sec. At the optimum conditions, the relative standard deviation were 8.78%, 3.12%, and 4.02% for Cd(II), Cu(lI) and Pb(lI) respectively for eight replicates (n = 8) measurements of 10 µg/L mixed standard solution of Cd(II), Cu(lI) and Pb(II). The method was applied to the direct simultaneous determination of Cd(II), Cu(lI) and Pb(lI) in sea water around Bungus, Padang City. Concentration of Cd(II), Cu(lI) and Pb(lI) in samples were equal to 1.8 pg/L for Cd(II), 38.6 µg/L for Cu(lI) and 0.7 pg/L for Pb(lI) with recovery of 87.03%, 98.80%, and 95.73%, respectively. Metoda selektif dan sensitif penentuan kadmium, tembaga dan timbal secara simultan dalam air laut dengan voltammetri striping adsorptif telah dilakukan. Tujuan dari penelitian ini adalah untuk mendapatkan kondisi optimum penentuan kadmium, tembaga dan timbal secara simultan. Voltammetri striping adsorptif telah digunakan untuk sejumlah runut Cd(II), Cu(lI) dan Pb(lI) dengan menggunakan kalkon sebagai pengomplek. Parameter yang dipelajari adalah: variasi konsentrasi kalkon, pH, potensial akumulasi dan variasi waktu akumulasi. Dari hasil penelitian diperoleh kondisi optimum adalah: konsentrasi kalkon 0,6 mM, pH = 4, potensial akumulasi -0,7 V dan waktu akumulasi 80 detik. Pada kondisi optimum diperoleh standardeviasi relatif (SDR) untuk delapan kali ulangan (n = 8) untuk pengukuran 10 µg/L campuran larutan standar Cd(II), Cu(lI) dan Pb(lI) adalah: 8,78% untuk Cd(II), 3,12% untuk Cu(lI) dan 4,02% untuk Pb(II). Metoda ini diaplikasikan untuk penentuan langsung Cd(II), Cu(lI) dan Pb(lJ) secara simultan dalam air laut sekitar perairan Bungus Kota Padang dengan metoda voltammetri striping adsorptif. Konsentrasi Cd(II), Cu(lI) dan Pb(lI) dalam sampel adalah: 1,8 µg/L untuk Cd(II), 38,6 µg/L untuk Cu(lI) dan 0,7 µg/L untuk Pb(lI) dengan perolehan kembali (recovery) masing-masing 87,03%,98,80%, dan 95,73%

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This paper was published in UGM Journals, OAI Repository.

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