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Behaviour and speciation of mercury in the Scheldt estuary (water sediments and benthic organisms) OMA
Baeyens, W.F.J.; Meuleman, C.; Muhaya, B.; Leermakers, M..
Surface waters, sediments and the polychaete <i>Nereis diversicolor</i> were sampled in the Scheldt Estuary between 1990 and 1994. In surface waters particulate Hg (Hg<sub>p</sub>) concentrations ranged from 350-1610 ng g-¹. They are essentially controlled by physical mixing of polluted fluvial particulates with relatively unpolluted marine particulates, but unaffected by seasonal changes. Dissolved Hg species, on the other hand, show large seasonal variations essentially controlled by the redox conditions in the estuary, as well as by bacterial and phytoplankton activity. Total dissolved (Hg<sub>TD</sub>) concentrations ranged from 0.5 to 3.0 ng l-¹ with 10 to 90% as reactive Hg. High concentrations of...
Tipo: Info:eu-repo/semantics/article
Ano: 1998 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7047
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Determination of methylmercury in natural waters by headspace gas chromatography with microwave-induced plasma detection after preconcentration on a resin containing dithiocarbamate groups OMA
Lansens, P.; Meuleman, C.; Leermakers, M.; Baeyens, W.F.J..
A method for the determination of methylmercury at ng 1<sup>-1</sup> levels in natural waters is described. Methylmercury present in a sample is first preconcentrated on a column of a resin containing dithiocarbamate groups and eluted quantitatively with acidic thiourea solution. Methylmercury in the effluent is then converted to the iodide by addition of sulphuric acid and iodoacetic acid and determined by headspace gas chromatography with microwave-induced plasma detection. The adsorption properties of the resin are discussed.
Tipo: Info:eu-repo/semantics/article
Ano: 1990 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3092
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