摘要
为评价污泥营养土中重金属对植物的生态毒理效应,评估污泥农用产生的生态风险,本研究选用Cu、Cd、Cr(Ⅵ)3种重金属,对污泥营养土培养的小麦根伸长进行单一、联合毒性试验。结果表明:营养土中的Cu、Cd、Cr(Ⅵ)对4天小麦根伸长的半抑制浓度EC50分别为0.624、3.27、119μmol/L,毒性由强到弱依次为:Cu>Cd>Cr(Ⅵ)。Cu和Cd的联合毒性表现为:低Cu高Cd组合表现为协同作用,随着Cu浓度升高,从较弱的拮抗作用转换成相互独立作用。Cu和Cr(Ⅵ)的联合毒性表现为:低浓度的Cu对Cr(Ⅵ)离子有协同作用,低浓度的Cr(Ⅵ)对Cu具有拮抗作用。Cd和Cr(Ⅵ)的联合毒性表现为:高浓度的Cd对Cr(Ⅵ)有拮抗作用,而非低浓度的Cr(Ⅵ)对Cd具有协同效应。
The paper aims to evaluate the eco-toxicological effects of heavy metals in sludge nutrient soil on plants and assess the ecological risk in sludge farming.We carried out single and combined toxicity tests on wheat root elongation cultured in sludge nutrient soil by choosing 3 heavy metals[Cu,Cd and Cr(Ⅵ)].The results showed that:the 4-day EC50 of Cu,Cd and Cr(Ⅵ)in nutrient soil was 0.624,3.27 and 119μmol/L,respectively,and the toxicity from strong to weak was:Cu>Cd>Cr(Ⅵ);there was a synergistic effect between low concentration Cu and high concentration Cd in inhibition of wheat root elongation,however,it was from weak antagonistic effect to mutual independent effect with the increase of Cu concentration in solution;the combined toxicity of Cu and Cr(Ⅵ)showed that:low concentration of Cu had a synergistic effect on Cr(Ⅵ),and low concentration Cr(Ⅵ)had antagonistic effect on Cu;the combined toxicity of Cd and Cr(Ⅵ)showed that:high concentration Cd had antagonistic effect on Cr(Ⅵ),while non-low concentration Cr(Ⅵ)had synergistic effects on Cd.
作者
韩萍
许斌
薛玉芬
Han Ping;Xu Bin;Xue Yufen(Qingdao Tuandao Sewage Treatment Plant,Qingdao Shandong 266002;Qingdao Water Group Environmental Energy Co.,Ltd,Qingdao Shandong 266002)
出处
《中国农学通报》
2020年第9期51-55,共5页
Chinese Agricultural Science Bulletin
关键词
污泥营养土
小麦根伸长
半抑制浓度(EC50)
急性毒性
联合作用
sludge nutrient soil
wheat root elongation
hemi-inhibitory concentration(EC50)
acute toxicity
combined effect
