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Lake Svyatoye, a non-draining (closed) lake in Belarus was selected for a whole-lake experiment into the effect of potassium on 137 Cs accumulation in fish. The lake is in a zone of 137 Cs contamination of more than 1,480 kBq/m , K+ concentration of the lake water (1.0 mg/1) prior to the experiment was relatively low,, and 137 Cs activity concentration ranged from 3.8 to 4.9 Bq/1. Prior to the experiment, the 137 Cs 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 137 Cs accumulation and retention in fish, 14,535 kg of potassium fertilizer was spread over the ice cover of the lake. After the application of KC1 fertilizer, the K+ concentration in the lake water increased to 10 mg/1. An increase of (K*) in water resulted, as expected, in an increase in 137 Cs activity concentration in water (to 9.55-15.1 Bq/1, with average 12.17 Bq/1), as a result of 137 Cs desorption from bottom sediments. In spite of the increase in I37 Cs in the water, the K+ addition resulted in a steady decrease of 137 Cs activity concentration in different fish species during the experiment (from 1998-2000) to approximately 30% to 50% of their original values.

An experiment to test the addition of potassium to a non-draining lake as a countermeasure to137Cs accumulation in fish

An experiment to test the addition of potassium to a non-draining lake as a countermeasure to¹³⁷Cs accumulation in fish