【摘要】 本文应用模拟生态实验装置和同位素示踪技术研究了³⁵S-杀虫双农药在模拟水生生态系统中的生物吸收和消失。在水—芜萍（Wolffia arrhiza wimm）—草鱼（Ctenopharyngodon idellus）—螺生态系统中,为期20d的蓄积试验表明,芜萍生物积聚率达24.65≥螺（肉1.67）>鱼（肉0.52）;鱼体内脏因含未排出的芜萍而其积聚率（4.01）>鳃（1.66）>骨（0.95）>肉（0.52）;转入洁水后,鱼体内的³⁵S-杀虫双可因排泄、代谢等原因而消失,残留消失半减期约10d,无生物浓缩。更多还原

【Abstract】 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.更多还原