137Cs in freshwater fish and lake water in Finland after the Chernobyl deposition

作者: Ritva L. Saxen

DOI:

关键词: HydrologyFreshwater fishEnvironmental chemistryPotassiumDeposition (aerosol physics)SedimentationEnvironmental scienceAquatic environmentWater flowLake waterSurface runoff

摘要: The uneven deposition of 137 Cs from the Chernobyl accident caused a large variation in activity concentrations Finnish lakes. lake water had decreased by more than 90% until end 1986, and thereafter decrease gradually slowed down. In 2002, waters varied 4 to 330 Bq m -3 . fish been generally highest 1987 or 1988 on average about 70% 2005. After deposition, several environmental processes, such as flow, sedimentation runoff, other characteristics potassium concentration, chemical parameters residence time lake, have changed distribution compartments aquatic environment. results also show that at various rates different lakes; three times rapidly one compared another lake. 2000-2004, concentration ranged 8 kg -1 7800 f.w. (f.w. = fresh weight).

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