Volume 37, Numéro C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-621 - C1-626|
|Publié en ligne||25 mars 2010|
An experiment to test the addition of potassium to a non-draining lake as a countermeasure to 137Cs accumulation in fish
Institute of Geological Sciences, Kuprevich Str. 7, Minsk 220141, Belarus
2 Centre for Ecology and Hydrology, Winfrith Technology Centre, Dorchester, Dorset DT2 8ZD, U.K.
Lake Svyatoye, a non-draining (closed) lake in Belarus was selected for a whole-lake experiment into the effect of potassium on 137Cs accumulation in fish. The lake is in a zone of 137Cs contamination of more than 1,480 kBq/m2, K+ concentration of the lake water (1.0 mg/l) prior to the experiment was relatively low, and 137Cs activity concentration ranged from 3.8 to 4.9 Bq/l. Prior to the experiment, the 137Cs activity concentrations in fish were amongst the highest of all aquatic systems affected by Chernobyl, being from 8.4 to 17.5 kBq/kg (wet weight) for rudd, from 12.4 to 16.7 kBq/kg for roach; from 58 to 105 kBq/kg for perch and up to 56 kBq/kg for pike. To study the effect of the dissolved K+ concentration upon 137Cs accumulation and retention in fish, 14,535 kg of potassium fertilizer was spread over the ice cover of the lake. After the application of KCl fertilizer, the K+ concentration in the lake water increased to 10 mg/l. An increase of [K+] in water resulted, as expected, in an increase in 137Cs activity concentration in water (to 9.55-15.1 Bq/l, with average 12.17 Bq/l), as a result of 137Cs desorption from bottom sediments. In spite of the increase in 137Cs in the water, the K+ addition resulted in a steady decrease of 137Cs activity concentration in different fish species during the experiment (from 1998-2000) to approximately 30% to 50% of their original values.
© EDP Sciences, 2002
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