多效唑在大型溞体内富集与释放行为

Bloconcentration and elimination of PP₃₃₃ in Daphnia magna

摘要: 本文探讨了大型在含藻（系统Ａ）和不含藻（系统Ｂ）水体内，对￣３Ｈ多效唑的生物富集以及释放行为。用药物动力学模型分析了多效唑在大型－水体之间的转移。结果表明：在实验初期，由于大型对小球藻的摄食作用，大型在系统Ａ的生物富集系数显著大于系统Ｂ，存在生物放大作用。而在实验后期，两个系统中大型对多效唑的生物富集系数趋于相近。多效唑在大型体内的释放行为符合一级动力学过程，半衰期为６ｈ．实验结束后，多效唑在大型体内的残留量占总量的２０％。

Abstract: The bioconcentration of ³H-PP₃₃₃ in Daphnia magna in system A (contained alage)and system B(no algae in water)and elimination were studied.The transfer of PP₃₃₃ between Daphnia magna and water was analyzed with medical dynamics model.The result showed that the BCFof PP₃₃₃ in Daphnia magna in system A was significantly higher than that in system B because of deeding at early period of the experment.So the bio-magnification was existed.However the BCF of PP₃₃₃in Daphnia magna between two systems was very close at the later period of the experiment.The elimination of PP₃₃₃in Daphnia magna fitted the process of first dynamics,with half-life 6 hours.After the experiment was finished,the residue of PP₃₃₃in Daphnia magna accounted for 20% of the total.