Acute and chronic toxic effects of pyrene on the benthic organisms in sediments
ZHONG Wen-jue, ZHANG Yu, ZHU Ling-yan
Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education, College of Environmental Science and Engineering of Nankai University, Tianjin 300350, China
Acute and chronic toxic effects of pyrene on Chironomus kiiensis and Monopylephorus limosus in sediment were studied in this paper.For Chironomus kiiensis,the median lethal concentrations (LC50) in 96h and 14d tests were 189mg/kg dw and 83.6mg/kg dw,and the median effect concentration (EC50) of emergence in 28d test was 26.1mg/kg dw.Pyrene could delay the emergence time of Chironomus kiiensis,while there are no significant difference in emergence time between male and female.Compared with Chironomus kiiensis,pyrene displayed lower toxicity to Monopylephorus limosus.The EC50 of body-surface trauma (including white rear,depressed rear and autotomy) of pyrene on Monopylephorus limosus in 14d and 21d test were 222mg/kg dw and 106mg/kg dw,and the EC50 of growth inhibition in 21d test was 81.7mg/kg dw.Comparing the Sediment quality criteria (SQC) of foreign countries with our results,we found that the existing SQC of pyrene were not suitable for China.We need much more toxicity data of pyrene on the benthic organisms in sediments to derive pyrene's SQC.The results of this study would provide a basis for deriving SQC and assessing ecological risk of pyrene.
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