Degradation and Microbial Uptake of C-60 Fullerols in Contrasting Agricultural Soils

作者：Berry Timothy D; Filley Timothy R^*; Clavijo Andrea P; Gray Marianne Bischoff; Turco Ronald

来源：Environmental Science & Technology, 2017, 51(3): 1387-1394.

DOI：10.1021/acs.est.6b04637

The environmental fate of functionalized carbon nanomaterials (CNM) remains poorly understood. Using C-13 labeled nanomaterial we present the results of a study investigating the mineralization and microbial uptake of surface-functionalized C-60 (fullerols) in agricultural soils with contrasting properties. Soil microcosms rapidly mineralized fullerol C, as determined by C-13 content in the respired CO2, with higher fullerol mineralization in an organic, clay-rich soil versus a silty, low C soil (similar to 56.3% vs similar to 30.9% fullerol C mineralized over 65 days). By tracking the enriched C-13 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 C-60, surface functionalized C-60 are unlikely to accumulate in surface soils and are readily mineralized by a range of soil microorganisms.

• 出版日期2017-2-7