农业环境科学学报Issue(12)：2329-2334,6.DOI:10.11654/jaes.2014.12.008
草甘膦对重金属毒性的抑制效应研究--以发光菌（Photobacterium phosphoreum T3）为例
Inhibitory Effect of Glyphosate on Toxicity of Heavy Metals:A Case Study on Photobacterium phosphoreum T3
摘要
Abstract
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.关键词
草甘膦/铜/镉/明亮发光杆菌/复合污染Key words
glyphosate/copper/cadmium/Photobacterium phosphoreum/combined pollution分类
资源环境引用本文复制引用
周垂帆,林静雯,李莹,王玉军,周东美..草甘膦对重金属毒性的抑制效应研究--以发光菌（Photobacterium phosphoreum T3）为例[J].农业环境科学学报,2014,(12):2329-2334,6.基金项目
国家自然科学基金项目（41422105，31400465）；环保部公益性行业科研专项 （）
