Simulation of ecotoxicological effects of perchlorate and hexavalent chromium combined pollution in the aquatic ecosystem
[Objective]To investigate the ecotoxicological effects of ClO4-and Cr6+on the aquatic ecosystem under combined pollution conditions.[Method]The aquatic ecosystem was constructed,Eichhornia crassipes,Daphnia carinata and Pomacea canaliculata with the same growth conditions were added,respectively,and exposed to water with different concentrations of ClO4-and Cr6+and their combined pollution.The ecotoxicological effects of ClO4-and Cr6+on E.crassipes,D.carinata and P.canaliculata under single and compound conditions were studied.[Result]With the increase of exposure time,the population of D.carinata increased first and then decreased.The 0.02 mg·L-1 Cr6+promoted the growth of D.carinata,while 200 mg·L-1 ClO4-,0.20 mg·L-1 Cr6+and their combined pollution inhibited the growth of D.carinata.The 0.02 mg·L-1 Cr6+had little effect on the growth of P.canaliculata;Howerver,single ClO4-(20 and 200 mg·L-1)and 0.20 mg·L-1 Cr6+as well as their combined pollution treatment groups had significant inhibitory effects.The contents of ClO4-and Cr6+in each organ of E.crassipes increased with the increase of pollutant concentration in water.Under the same concentration of pollutant,the order of ClO4-content in all organs was leaf＞stem＞root,the order of Cr6+content was root＞stem＞leaf.The contents of ClO4-in D.carinata and P.canaliculata were lower than that in E.crassipes.[Conclusion]Both single and combined pollution of ClO4-and Cr6+cause toxic effects on organisms in aquatic ecosystems.E.crassipes has strong absorption ability to ClO4-and Cr6+,with ClO4-mainly concentrated in leaf,and Cr6+in root.The absorbing abilities of D.carinata and P.canaliculata to ClO4-were weaker than that of E.crassipes.
国家科技期刊平台
NSTL
万方数据
