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《Rural Eco-environment》 1993-01
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BIOACCUMULATION AND DISAPPEARANCE OF ~(35)S- DIMEHYPO IN SIMULATED AQUATIC ECOSYSTEM.

Chen Zuyi, Mi Chunyun and Cheng Bing (Isotopic Techniques Application and Research Laboratory, Nangjing Agricultural University, Nanjing 210014) :Rural Eco-environment, No, 1. 1993, pp. 37-38  
The bioacrumulation and disappearance of 35S-dimehypo in simulated aquatic ecosystem were investigated, using simulated ecosystem experimental facilities and radioiso-tope tracer techniques. After the experiment for 20 days ,high absorption by Wolffia arrhiza Wimm was found in the ecosys- tem of water,Wolffia arrhiza Wimm,Ctenopharyngodon in-dellus and snail. The bioaccumulation ratios of Wolffia arrhiza Wimm was 24. 65% , which is much higher than that of snail or fish. The bioaccumulation ratios of fish parts differed, viscera with the remain of Wolff ia arrhizaWimm (4. 01 %). gill (1. 66%)bone (0. 95%)meat (0. 52%). After the fish were transferred from the contaminated water to clean water, the disappearance of 35 S-dimehypo in the processes of fish excretion and metabolism was also examined. As a result, the residual pesticide disappears with time, with its half life about 10 days.
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