Li Dong, Lyon Delina Y, Li Qilin, Alvarez Pedro J J
Department of Civil and Environmental Engineering, Rice University, Houston, Texas 77005, USA.
Environ Toxicol Chem. 2008 Sep;27(9):1888-94. doi: 10.1897/07-548.1.
The present study investigated the association of a C60 water suspension (nC6) with natural organic matter, present as a soil constituent or dissolved in the water column, and its effect on the antibacterial activity of nC60. Sorption of nC60 to soil reduced its bioavailability and antibacterial activity, and the sorption capacity strongly depended on the organic content of the soil. Adsorption of aquatic dissolved humic substances onto nC60 and possible subsequent reactions also were found to eliminate nC60 toxicity at humic acid concentrations as low as 0.05 mg/L. These findings indicate that natural organic matter in the environment can mitigate significantly the potential impacts of nC60 on microbial activities that are important to ecosystem health.
本研究调查了作为土壤成分或溶解于水柱中的天然有机物与C60水悬浮液（nC6）之间的关联，以及其对nC60抗菌活性的影响。nC60在土壤中的吸附降低了其生物有效性和抗菌活性，且吸附能力很大程度上取决于土壤的有机含量。还发现，水生溶解腐殖物质在nC60上的吸附以及可能随后发生的反应，在腐殖酸浓度低至0.05 mg/L时就能消除nC60的毒性。这些发现表明，环境中的天然有机物能够显著减轻nC60对生态系统健康至关重要的微生物活动的潜在影响。
