农业环境科学学报
農業環境科學學報
농업배경과학학보
Journal of Agro-Environment Science
2014年
12期
2329-2334
,共6页
周垂帆%林静雯%李莹%王玉军%周东美
週垂帆%林靜雯%李瑩%王玉軍%週東美
주수범%림정문%리형%왕옥군%주동미
草甘膦%铜%镉%明亮发光杆菌%复合污染
草甘膦%銅%鎘%明亮髮光桿菌%複閤汙染
초감련%동%력%명량발광간균%복합오염
glyphosate%copper%cadmium%Photobacterium phosphoreum%combined pollution
草甘膦分子(C3H8NO5P)中含有较多配位基团如羧基、氨基、磷酸基,对重金属阳离子有很强的络合能力,可能会影响重金属的生物有效性进而影响其毒性。为了解草甘膦(GPS)和铜(Cu)、镉(Cd)交互对发光菌毒性效应,以明亮发光杆菌T3小种(Photobacterium phosphoreum T3)为例,进行了室内模拟试验研究。结果表明:Cu、Cd对发光菌有很强的毒性(EC50分别为1.28、0.89 mg·L-1);没有控制pH的草甘膦能够降低溶液pH,对发光菌亦有较强的毒性(EC50为35.9 mg·L-1);但控制pH值为5.0的草甘膦对发光菌无明显毒性,并且能够显著降低Cu、Cd对发光菌的抑制,同时随着GPS/Cu、GPS/Cd摩尔比值的增大使毒性降低,直至无明显毒性。据此认为,在重金属和农药草甘膦共存的环境当中,草甘膦能够影响重金属的形态,进而影响重金属的生物有效性和毒性。
草甘膦分子(C3H8NO5P)中含有較多配位基糰如羧基、氨基、燐痠基,對重金屬暘離子有很彊的絡閤能力,可能會影響重金屬的生物有效性進而影響其毒性。為瞭解草甘膦(GPS)和銅(Cu)、鎘(Cd)交互對髮光菌毒性效應,以明亮髮光桿菌T3小種(Photobacterium phosphoreum T3)為例,進行瞭室內模擬試驗研究。結果錶明:Cu、Cd對髮光菌有很彊的毒性(EC50分彆為1.28、0.89 mg·L-1);沒有控製pH的草甘膦能夠降低溶液pH,對髮光菌亦有較彊的毒性(EC50為35.9 mg·L-1);但控製pH值為5.0的草甘膦對髮光菌無明顯毒性,併且能夠顯著降低Cu、Cd對髮光菌的抑製,同時隨著GPS/Cu、GPS/Cd摩爾比值的增大使毒性降低,直至無明顯毒性。據此認為,在重金屬和農藥草甘膦共存的環境噹中,草甘膦能夠影響重金屬的形態,進而影響重金屬的生物有效性和毒性。
초감련분자(C3H8NO5P)중함유교다배위기단여최기、안기、린산기,대중금속양리자유흔강적락합능력,가능회영향중금속적생물유효성진이영향기독성。위료해초감련(GPS)화동(Cu)、력(Cd)교호대발광균독성효응,이명량발광간균T3소충(Photobacterium phosphoreum T3)위례,진행료실내모의시험연구。결과표명:Cu、Cd대발광균유흔강적독성(EC50분별위1.28、0.89 mg·L-1);몰유공제pH적초감련능구강저용액pH,대발광균역유교강적독성(EC50위35.9 mg·L-1);단공제pH치위5.0적초감련대발광균무명현독성,병차능구현저강저Cu、Cd대발광균적억제,동시수착GPS/Cu、GPS/Cd마이비치적증대사독성강저,직지무명현독성。거차인위,재중금속화농약초감련공존적배경당중,초감련능구영향중금속적형태,진이영향중금속적생물유효성화독성。
Glyphosate(N-[phosphonomethyl]-glycine, GPS)is one of the most widely used herbicides in agricultural and forestry produc-tion. It contains functional groups of amine, carboxylate and phosphonate that can form strong coordination bonds with metal ions and thus may affect the bioavailability and toxicity of heavy metals in soils. Therefore, a laboratory experiment was conducted to investigate the inter-actions between GPS and heavy metals(Cu and Cd)with respect to their acute toxicity to Photobacterium phosphoreum T3. Results showed that the toxicity of Cu and Cd to photobacterium was very strong(EC50 was 1.28 mg·L-1 and 0.89 mg·L-1 for Cu and Cd, respectively). The GPS obviously decreased pH in the media and possessed much greater toxicity to photobacterium(EC50 was 35.9 mg·L-1)when the medium pH remained unadjusted. However, GPS did not show toxicity when the medium pH maintained at 5.0. The presence of GPS obviously re-lieved the acute toxicity of Cu and Cd to photobacterium. Increasing molar ratios of GPS/Cu and GPS/Cd significantly decreased the toxicity of Cu and Cd to photobacterium. Copper toxicity disappeared at GPS/Cu molar ratio greater than 1. In conclusion, GPS could modify specia-tion of heavy metals, and thus their toxicity in GPS and heavy metals co-existing systems.