Hu Xialin, Liu Jingfu, Mayer Philipp, Jiang Guibin
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, P.O. Box 2871, Beijing 100085, China.
Environ Toxicol Chem. 2008 Sep;27(9):1868-74. doi: 10.1897/08-009.1.
The wide application of engineered carbon nanomaterials (CNMs), such as fullerene (C60), inevitably will result in their introduction into the aqueous environment. It is likely CNMs will associate with abundant natural organic matter (NOM) and engineered surfactants to form stable aqueous suspensions through various environmental processes. The present study reveals that sorption of polycyclic aromatic hydrocarbons (PAHs) to fullerene resulted in a remarkable decline of freely dissolved PAH concentrations. For the three PAHs studied (phenanthrene, fluoranthene, and chrysene) with log K(ow) in the range of 4.56 to 5.81, the measured sorption coefficients to aqueous suspensions of fullerene (log K(C60) = 4.71-5.48) were close to that of dissolved organic carbon (DOC) from Aldrich humic acid (log K(DOC) = 4.48-5.91). Aqueous suspensions of fullerene were stable for a wide range of pH (3.0-11.0) and salinity conditions (0-25 mM NaCl), and the pH and salinity had minor effects on the sorption of PAHs to aqueous suspensions of fullerene. The addition of humic acids (5 mg/L DOC) to the fullerene (5 mg/L) suspensions resulted in an additional reduction of freely dissolved PAH concentrations. The high PAH sorption coefficients to suspended fullerene suggest that the release of fullerene to the aquatic environment might affect PAH fate and exposures.
工程碳纳米材料（CNMs），如富勒烯（C60）的广泛应用，不可避免地会导致其进入水环境。通过各种环境过程，碳纳米材料很可能会与大量天然有机物（NOM）和工程表面活性剂结合，形成稳定的水悬浮液。本研究表明，多环芳烃（PAHs）在富勒烯上的吸附导致自由溶解的PAH浓度显著下降。对于所研究的三种PAHs（菲、荧蒽和芘），其log K(ow)在4.56至5.81范围内，测得的在富勒烯水悬浮液上的吸附系数（log K(C60) = 4.71 - 5.48）与来自Aldrich腐殖酸的溶解有机碳（DOC）的吸附系数（log K(DOC) = 4.48 - 5.91）相近。富勒烯水悬浮液在广泛的pH（3.0 - 11.0）和盐度条件（0 - 25 mM NaCl）下是稳定的，并且pH和盐度对PAHs在富勒烯水悬浮液上的吸附影响较小。向富勒烯（5 mg/L）悬浮液中添加腐殖酸（5 mg/L DOC）会导致自由溶解的PAH浓度进一步降低。PAHs在悬浮富勒烯上的高吸附系数表明，富勒烯向水生环境中的释放可能会影响PAHs的归宿和暴露情况。
