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| Inhibitory Effect of Glyphosate on Toxicity of Heavy Metals:A Case Study on Photobacterium phosphoreum T3 |
| Received:May 12, 2014 |
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| KeyWord:glyphosate;copper;cadmium;Photobacterium phosphoreum;combined pollution |
| Author Name | Affiliation | E-mail | | ZHOU Chui-fan | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | LIN Jing-wen | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | LI Ying | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | WANG Yu-jun | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | yjwang@issas.ac.cn | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| Glyphosate(N-[phosphonomethyl]-glycine, GPS) is one of the most widely used herbicides in agricultural and forestry production. 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 interactions 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 relieved 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 speciation of heavy metals, and thus their toxicity in GPS and heavy metals co-existing systems. |
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