沉积物中芘对淡水底栖动物的急慢性毒性效应

发布时间：2018-04-13 23:34

本文选题：芘 + 毒性效应　；参考：《中国环境科学》2017年07期

【摘要】：研究了沉积物中芘对淡水底栖动物花翅羽摇蚊幼虫和淡水单孔蚓的急慢性毒性效应.芘对花翅羽摇蚊幼虫96h及14d的半数致死浓度(LC50)分别为189mg/kg干重和83.6mg/kg干重,28d羽化半数抑制浓度(EC50)为26.1mg/kg干重.沉积物中芘对花翅羽摇蚊幼虫的羽化时间具有延滞作用,但是对雌雄个体羽化时间的延滞作用没有显著的差异.淡水单孔蚓对芘的耐受力较摇蚊幼虫强.芘对淡水单孔蚓体表损伤(包括尾部发白、尾部凹陷及自断)的14d及21d EC50分别为222mg/kg干重和106mg/kg干重,21d生长抑制的EC50为81.7mg/kg干重.比较国外已有的芘沉积物质量基准值和本文的初步评估结果发现,国外的芘沉积物质量基准值并不适合我国所用,需要更全面的沉积物中芘对底栖生物的毒性数据来对我国的芘淡水沉积物质量基准值进行推导.本研究结果对推导芘的沉积物质量基准和进行沉积物生态风险评价提供帮助.
[Abstract]:The acute and chronic toxicity of pyrene in sediments to the larvae of Chironomus albopictus and the freshwater vermis in freshwater benthos was studied.The median lethal concentration (LC50) of pyrene to the larvae of Chironomus pinnatifida was 189mg/kg dry weight (189mg/kg) and Eclosion half inhibitory concentration (EC50) of 83.6mg/kg dry weight for 28 days (26.1mg/kg dry weight).Pyrene in sediments had a delayed effect on the emergence time of Chironomus pteronyx larvae, but there was no significant difference in the ejaculation time between male and female individuals.The tolerance of freshwater vermis to pyrene was stronger than that of Chironomus.The EC50 of pyrene on the surface of fresh water single pore earthworm (including tail whitening, caudal depression and self-breaking) was 222mg/kg dry weight and 106mg/kg dry weight 21 days growth inhibition EC50 was 81.7mg/kg dry weight, respectively.Compared with the existing pyrene sediment quality reference values abroad and the preliminary evaluation results in this paper, it is found that the foreign pyrene sediment quality reference values are not suitable for our country.More comprehensive data on the toxicity of pyrene to benthos in sediments are needed to deduce the reference value of pyrene freshwater sediment quality in China.The results of this study are helpful to deduce the sediment quality standard of pyrene and evaluate the ecological risk of sediments.
【作者单位】：南开大学环境科学与工程学院天津城市生态环境修复与污染防治重点实验室教育部环境污染过程与基准重点实验室;
【基金】：公益性行业(农业)科研专项(201503108) 天津市自然科学基金资助项目(16JCYBJC29800) 高等学校博士学科点专项科研基金资助项目(20130031120018) 中央高校基本科研业务费专项资金资助(zla2076698)
【分类号】：X171.5

【参考文献】