Degradation and Microbial Uptake of C60 Fullerols in Contrasting Agricultural Soils

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• 作者：Timothy D. Berry ; Timothy R. FilleyAndrea P. Clavijo ; Marianne Bischoff Gray ; Ronald Turco
• 刊名：Environmental Science & Technology
• 出版年：2017
• 出版时间：February 7, 2017
• 年：2017
• 卷：51
• 期：3
• 页码：1387-1394
• 全文大小：393K
• ISSN：1520-5851

文摘

The environmental fate of functionalized carbon nanomaterials (CNM) remains poorly understood. Using p>13p>C-labeled nanomaterial we present the results of a study investigating the mineralization and microbial uptake of surface-functionalized C₆₀ (fullerols) in agricultural soils with contrasting properties. Soil microcosms rapidly mineralized fullerol C, as determined by p>13p>C-content in the respired CO₂, with higher fullerol mineralization in an organic, clay-rich soil versus a silty, low C soil (∼56.3% vs ∼30.9% fullerol C mineralized over 65 days). By tracking the enriched p>13p>C from fullerol into microbial phospholipid fatty acids (PLFA) we also report, for the first time, the incorporation of nanomaterial-derived C into soil microbial biomass, primarily by fungi and Gram-negative bacteria. While more fullerol C was incorporated into PLFA in the organic C-rich soil (0.77% vs 0.19% of PLFA C), this soil incorporated fullerol C into biomass less efficiently than the silty, low C soil (0.13% and 0.84% of assimilated fullerol C, respectively). These results demonstrate that, in contrast to pristine C₆₀, surface functionalized C₆₀ are unlikely to accumulate in surface soils and are readily mineralized by a range of soil microorganisms.