en
Scientific article
English

Solid phase extraction and diffusive gradients in thin films techniques for determination of total and labile concentrations of Cd(II), Cu(II), Ni(II) and Pb(II) in Black Sea water

Publication date2011
Abstract

Total dissolved and labile concentrations of Cd(II), Cu(II), Ni(II) and Pb(II) were determined at six locations of the Bourgas Gulf of the Bulgarian Black Sea coast. Solid phase extraction procedure based on monodisperse, submicrometer silica spheres modified with 3-aminopropyltrimethoxysilane followed by the electrothermal atomic absorption spectrometry (ETAAS) was developed and applied to quantify the total dissolved metal concentrations in sea water. Quantitative sorption of Cd, Cu, Ni and Pb was achieved in the pH range 7.5–8, for 30 min, adsorbed elements were easily eluted with 2 mL 2 mol L^−1 HNO3. Since the optimal pH for quantitative sorption coincides with typical pH of Black Sea water (7.9–8.2), on-site pre-concentration of the analytes without any additional treatment was possible. Detection limits achieved for total dissolved metal quantification were: Cd 0.002 µg L^−1, Cu 0.005 µg L^−1, Ni 0.03 µg L^−1, Pb 0.02 µg L^−1 and relative standard deviations varied from 5–13% for all studied elements (for typical Cd, Cu, Ni and Pb concentrations in Black Sea water). Open pore diffusive gradients in thin films (DGT) technique was employed for in-situ sampling and pre-concentration of the sea water and in combination with ETAAS was used to determine the proportion of dynamic (mobile and kinetically labile) species of Cd(II), Cu(II), Ni(II) and Pb(II) in the sea water. Obtained results showed strong complexation for Cu and Pb with sea water dissolved organic matter. The ratios between DGT-labile and total dissolved concentrations found for Cu(II) and Pb(II) were in the range 0.2–0.4. For Cd and Ni, these ratios varied from 0.6 to 0.8, suggesting higher degree of free and kinetically labile species of these metals in sea water.

Keywords
  • Solid phase extraction
  • DGT
  • Speciation
  • Trace elements
  • Black Sea
Citation (ISO format)
DAKOVA, Ivanka et al. Solid phase extraction and diffusive gradients in thin films techniques for determination of total and labile concentrations of Cd(II), Cu(II), Ni(II) and Pb(II) in Black Sea water. In: International journal of environmental analytical chemistry, 2011, vol. 91, n° 1, p. 62–73. doi: 10.1080/03067310903195011
Identifiers
ISSN of the journal0306-7319
560views
0downloads

Technical informations

Creation08/31/2011 8:14:00 PM
First validation08/31/2011 8:14:00 PM
Update time03/14/2023 4:53:52 PM
Status update03/14/2023 4:53:52 PM
Last indexation01/15/2024 10:32:02 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack