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Transfer 137Cs & 60Co in waste retention pond with emphasis on aquatic insects (1985)

Auteur	Voshell
Datum	november 1985
Classificatie	6.01.3.90/05 (VEILIGHEID - CENTRALES - BRONTERM)
Voorkant

TRANSFER OF 137Cs AND 60Co IN A WASTE RETENTION POND WITH EMPHASIS ON AQUATIC INSECTS*

Abstract -The objectives of this research were (1) to analyze the transfers of 137Cs 
ant 60Co in a retention pond, with emphasis on aquatic insects and (2) to determine 
if detectable concentrations of these radionuclides are exported by emerging aquatic 
insects. We analyzed the radionuclide concentrations in the following components 
water solution bottom sediments, suspended particulate matter, plankton, floating 
mats of filamentous algae, benthic macro invertebrates, and emerging aquatic 
insects. Samples were collected quarterly from June 1981 to April 1982. The lowest 
concentrations (in Pico curies per milliliter) occurred in solution (range: 1.4x10 2 to 
3.2 x 10 2 for 137Cs and 8.l x 10 . to 2.2 x l0 . for 60Co). The highest concentrations
(in picocuries per gram dry weight) occurred in the sediments (range: 1.5  x 10 4 to 
1.1 x 10 4 for 137Cs and 1.0 x 10 2 to 4.3 x 10 6  for 60Co. The primary producers
and aquatic insect consumers had concentrations of both radionuclides that were 
two to four orders of magnitude higher than the respective concentrations dissolved 
in water hut two to three orders of magnitude lower than the concentrations in the 
sediments. The concentrations of both radionuclides decreased successively at 
higher trophic levels. There were considerable temporal variations as the 
radionuclides cycled among the abiotic and biotic components of the pond. 
Emerging adult aquatic inserts had lower concentrations of both radionudides 
than the immature stages that lived in the pond (adult/immature ratio about 0.25). 
Because the emerging adult insects contain detectable concentrations of radionuclides, 
have relatively long life spans, and disperse away from the aquatic habitat, we
 conclude that adult aquatic insects would he effective biological monitors.

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