Concentrations of cadmium and lead heavy metals in Dardanelles seawater


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SÜREN E., Yilmaz S. , Turkoglu M. , KAYA S.

ENVIRONMENTAL MONITORING AND ASSESSMENT, vol.125, pp.91-98, 2007 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 125
  • Publication Date: 2007
  • Doi Number: 10.1007/s10661-006-9242-5
  • Title of Journal : ENVIRONMENTAL MONITORING AND ASSESSMENT
  • Page Numbers: pp.91-98
  • Keywords: cadmium, lead, heavy metals, oxine, seawater, waste water, water pollution, adsorptive stripping voltammetry, inductively coupled plasma-atomic emission spectrometry, ANODIC-STRIPPING VOLTAMMETRY, SURFACE-WATER, SEA-WATER, ELECTRODE, MERCURY, TURKEY, COPPER

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.

Keywords: Cadmium Lead Heavy metals Oxine Seawater Waste water Water pollution Adsorptive stripping voltammetry Inductively coupled plasma-atomic emission spectrometry

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 mu g l(-1) (RSD, 5.50%) for Cd and 0.931 and 3.104 mu g 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.