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1A - Environmental analytical methods (MOP/3) Diffusive sampling of N- and P containing pesticides in water. Bergqvist, Per-Anders1, Nilsson, Erika1, Wiberg, Karin1, 1 Umeå University, Umea, Sweden, Sweden ABSTRACT- Diffusive sampling technologies has the possibility to integrate the pollution concentration. In environmental and effluent situations it is beneficial to perform the integration during a extended period of time. The sampling device used in the study integrate log Kow2-4 compounds during up to three weeks. Several common pesticides as Atrazine, Chlorpropham, Carbofuran, Simazine, Methiocarb and Metazachlor were studied. Laboratory studies are presented where calibration of the sampling rate of pesticides are performed. Sampling rate varies depending on compound and these compounds are normally truly water dissolved. The sampler consist of a rate limiting membrane for the uptake and followed by a collection medium. The surface area of the sampler is large (more than 14 square cm) enabling good detection limits. Interaction with humic acids and other natural compounds might decrease the water dissolved concentration of semipolar pesticides. Since the sampler reveal only the dissolved concentrations a picture of the existing exposure concentrations will be measured over time. The compounds were detected with gas chromatography / mass spectrometry and several internal standards were used during the quantification. Key words: diffusive, Pesticides, sampling, water |
