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多氯联苯(PCB153与PCB28)对大型溞的毒性效应研究

Keywords: 多氯联苯(PCB153与PCB28),大型溞,LC50,内禀增长率

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Abstract:

选用大型溞作为受试生物,探讨多氯联苯(PCB153与PCB28)对浮游动物的急性和慢性毒性反应,初步评价多氯联苯(PCBs)对浮游动物的毒害效应。急性毒性试验中,PCB28和PCB153对大型溞的48h-LC50分别为27.08μg·L-1和579.16μg·L-1。实验表明,大型溞对PCB28的敏感性高于对PCB153的敏感性。慢性毒性试验显示,PCB28和PCB153对大型溞的生长、生殖均有不利影响,PCB28的影响表现为随浓度的升高,生长和生殖抑制效应加强;PCB153对大型溞生长的影响表现为随浓度升高而抑制效应增强,但其对大型溞的繁殖则表现为低浓度抑制而高浓度促进的现象。因此,低浓度多氯联苯(PCB153、PCB28)长期暴露的潜在毒性和高浓度多氯联苯的急性毒性在环境生态安全研究中值得高度关注。

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