杀螟丹和Cr^(6+)复合污染对赤子爱胜蚓的毒性研究  

Joint toxicity of cartap and Cr^(6+) to Eisenia foetida

作　　者：朱艳 高晨昕 孟雨婷 肖娴 刘建国 赵远 ZHU Yan;GAO Chen-xin;MENG Yu-ting;XIAO Xian;LIU Jian-guo;ZHAO Yuan(School of Environment&Safety Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学环境与安全工程学院,江苏常州213164

出　　处：《农业环境科学学报》2021年第2期300-309,共10页Journal of Agro-Environment Science

基　　金：江苏省研究生科研创新计划项目(SJCX20_0940)。

摘　　要：为了考察土壤中重金属与农药复合体系下的联合毒性效应,以赤子爱胜蚓为受试生物,采用毒性试验方法,研究了Cr^(6+)和杀螟丹的单一及复合污染对蚯蚓的影响。结果表明,杀螟丹对赤子爱胜蚓单一毒性大于Cr^(6+),杀螟丹和Cr^(6+)联合毒性效应作用类型以拮抗作用为主。在不同污染物暴露下,蚯蚓的生理生化指标都有不同程度的变化。杀螟丹单一作用时,赤子爱胜蚓体内蛋白含量随染毒时间和浓度增加先升高后降低;在短时间内,超氧化物岐化酶(Superoxide dismutase,SOD)活力存在诱导作用;丙二醛(Malondialdehyde,MDA)和过氧化氢酶(Catalase,CAT)含量在染毒初期被促进,随时间延长两者含量大幅度降低。Cr^(6+)单一作用时,赤子爱胜蚓体内蛋白含量、CAT活力随Cr^(6+)浓度升高先升高后降低;SOD活力在后期受到抑制,MDA含量持续升高。杀螟丹和Cr^(6+)联合作用初期对赤子爱胜蚓体内蛋白含量有增加作用;SOD活力前期、中期促进,后期抑制;随染毒时间的延长,CAT活力升高,MDA含量则降低。研究表明,SOD活力、MDA含量均可作为蚯蚓在应对氧化胁迫时,机体受氧化损伤程度的判断指标。Eisenia foetida was used as the test organism to investigate the joint toxicity of the heavy metal Cr^(6+)and the pesticide cartap on earthworms.Results showed that the single toxicity of cartap to Eisenia foetida was greater than that of Cr^(6+)and that their joint toxicity manifested antagonistic effects.While exposed to different pollutants,the physiological and biochemical properties of Eisenia foetida varied to different degrees.As the exposure time and concentration of cartap increased,the protein content of Eisenia foetida increased at the initial phase and then decreased.Superoxide dismutase(SOD)activity was induced in a short time and catalase(CAT)and malondialdehyde(MDA)contents increased during the initial stages of exposure and decreased significantly with time.When exposed to Cr^(6+)as a single pollutant,proteins and CAT in Eisenia foetida first increased and then decreased as the concentration of Cr^(6+)increased,and SOD concentrations were inhibited in the later stages as those of MDA continued to increase.The compounds of cartap and Cr^(6+)induced an increase in the protein content in Eisenia foetida,while SOD activity was promoted during the early stage and middle stage and inhibited in the late stage.CAT activity and MDA content increased and decreased,respectively,as the exposure time increased.These results show that SOD and MDA can be used as indicators to judge the degree of oxidative damage to Eisenia foetida.

关 键 词：重金属 农药 复合污染 联合毒性 酶 

分 类 号：X171.5[环境科学与工程—环境科学]