Concentrations of cadmium and lead heavy metals in Dardanelles seawater |
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Authors: | Esin Süren Selahattin Yilmaz Muhammet Türkoglu Selahattin Kaya |
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Institution: | (1) Department of Chemistry, Faculty of Arts & Sciences, University of Canakkale Onsekiz Mart, 17020 Canakkale, Turkey;(2) Department of Hidrobiology, Marine Biology Sec., Faculty of Fisheries, University of Canakkale Onsekiz Mart, Terzioglu Camp., 17020 Canakkale, Turkey |
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Abstract: | Cadmium and lead were determined simultaneously in seawater by differential pulse stripping voltammetry (DPSV) preceded by
adsoptive collection of complexes with 8-hydroxyquinoline (oxine) on to a hanging mercury drop electrode (HMDE). In preliminary
experiments the optimal analytical condition for oxine concentration was found to be 2.10−5 M, at pH 7.7, the accumulation potential was −1.1 V, and the initial scannig potential was −0.8 V. The peak potentials were
found −0.652 V for Cd and −0.463 V for Pb At the 60 s accumalation time. The limit of detection (LOD) and limit of quantitatification
(LOQ) were found to be by voltammetry as 0.588 and 1.959 μg l−1 (RSD, 5.50%) for Cd and 0.931 and 3.104 μg l−1 (RSD, 4.10%) for Pb at 60 s stirred accumulation time respectively. In these conditions the most of the seawater samples
are amenable for direct voltammetric determination of cadmium and lead using a HMDE. An adsorptive stripping mechanism of
the electrode reaction was proposed. For the comparison, seawater samples were also analysed by ICP-atomic emission spectrometry
method (ICP-AES). The applied voltammetric technique was validated and good recoveries were obtained. |
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Keywords: | Cadmium Lead Heavy metals Oxine Seawater Waste water Water pollution Adsorptive stripping voltammetry Inductively coupled plasma-atomic emission spectrometry |
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