title: Concentrations of cadmium and lead heavy metals in Dardanelles seawater.
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 microg l(-1) (RSD, 5.50%) for Cd and 0.931 and 3.104 microg 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.
authors.affiliation: Department of Chemistry, Faculty of Arts & Sciences, University of Canakkale Onsekiz Mart, Canakkale, Turkey.
authors.forename: Esin
authors.initials: E
authors.lastname: Süren
authors.forename: Selahattin
authors.initials: S
authors.lastname: Yilmaz
authors.forename: Muhammet
authors.initials: M
authors.lastname: Türkoglu
authors.forename: Selahattin
authors.initials: S
authors.lastname: Kaya
mesh_terms: D002104:Cadmium / Q000032:analysis; D004563:Electrochemistry; D007220:Industrial Waste / Q000032:analysis*; D007854:Lead / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D012623:Seawater / Q000032:analysis*; D013054:Spectrophotometry, Atomic; D014186:Transportation; D014876:Water Pollution / Q000032:analysis*
chemical_list: D007220:Industrial Waste; D019216:Metals, Heavy; D002104:Cadmium; D007854:Lead