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Retrospective monitoring of mercury in fish from selected European freshwater and estuary sites

: Nguetseng, Regine; Fliedner, Annette; Knopf, Burkhard; Lebreton, Benoit; Quack, Markus; Rüdel, Heinz

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Chemosphere 134 (2015), S.427-434
ISSN: 0045-6535
ISSN: 0366-7111
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IME ()
trend monitoring; biota monitoring; environmental quality standard; abramis brama; mercury; methylmercury

Levels and trends of total mercury (THg) and methylmercury (MeHg) compounds in bream (Abramis brama) from different European sites were compared. Bream were collected between 2007 and 2013 in the estuaries of the rivers Scheldt (Netherlands), Rhone (France), Gota alv (Sweden), Tees (United Kingdom), and Mersey (UK), and in Lake Belau (Germany). A direct mercury analyzer was used to determine THg concentrations while MeHg was measured by gas chromatography/inductively coupled plasma-mass spectrometry applying stable isotope dilution. THg and MeHg in annual pool samples of bream ranged between 15.9 and 251 lg kg\'031 wet weight (ww) with lowest concentrations found at the reference site Lake Belau and highest in samples from the river Rhone. The EU environmental quality standard (EQS) of 20 lg kg\'031 ww was exceeded at all sites and in all years except at Lake Belau in 2012.
Significantly decreasing trends over time were observed only in bream from the Rhone, while THg increased in bream from the Western Scheldt. The MeHg fractions of THg were always >80% and a significant difference between sites was detected only in one case (Rhone vs. Lake Belau).