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(76-04) Assessment of Bioavailable Polycycling Aromatic Hydrocarbons in French Coastal Waters: Comparison of Sampling Techniques. Pazdro, K.*,1, Moisan, K.2, Tronczynski, J.2, 1 Institute of Oceanology, Polish Academy of Sciences, ul. PowstaMISSING CHARACTER ENTITY: ngravecòw Warszawy 55, Sopot, POLAND2 IFREMER/Centre de Nantes, Nantes, FRANCE ABSTRACT- A field study was carried out in coastal waters of Brittany (France) during April and May 2000. In situ passive samplers -semipermeable membrane devices filled with triolein (SPMDs) and mussels (Mytilus galloprovincialis) were used to study contamination by polycyclic aromatic compounds originating from the oil spills after 'Erika' tanker accident in December 1999. Large volume sampling of particulate and dissolved fractions onto filters and XAD2 resins was used to measure the concentrations of particulate and dissolved compunds during the experiment. The samples were processed and analysed by GC-MS for determination PAH concentrations. Both, SPMDs and mussels effectively concentrated contaminants covering a fairly wide polarity and molecular weight range (from napthalenes to up to 5-ring PAHs, parent and alkylated). The PAH concentrations measured using conventional technique were generally found to be low and in many cases below the limits of detection. The concentration of PAHs in the membranes and in caged mussels were in the same order of magnitude. The results revealed relatively good accordance of levels of most of compounds with 3,5 < Kow < 6,0, however, the significant differences were observed for other individual compounds. Estimation of dissolved PAH concentrations using appropriate SPMD and mussels uptake kinetics models (linear or equilibrium) was performed. Estimation of ambient water based on SPMD results seems to be more accurate comparing to this based on mussels tissue accumulation. Furthermore the SPMDs time-integrated preconcentrators, allowed detection of some background PAH in coastal waters not detected by conventional method (at pg/dm3 levels). The study confirmed the potential of SPMDs for use in marine waters monitoring, producing results comparable with conventional technique and living organisms. However, to make this more reliable and accurate, the adjustment to real environmental conditions should be made by using permeability reference compounds. Key words: Semipermeable Membrane Devices (SPDM), Blue Mussels, XAD 2, PAH |
