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Carbon nanomaterials differentially impact bioaccumulation and oxidative response of phenanthrene and methyl derivatives in geophagous earthworms (Metaphire guillelmi): A multi-contaminant exposure study

文献类型： 外文期刊

作者： Zhang, Haiyun 1 ; Chen, Weixiao 1 ; Zhang, Xinyu 1 ; Wu, Fan 1 ; White, Jason C. 3 ; Tao, Shu 1 ; Wang, Xilong 1 ;

作者机构： 1.Peking Univ, Coll Urban & Environm Sci, Lab Earth Surface Proc, Beijing 100871, Peoples R China

2.Shanghai Acad Agr Sci, Inst Ecoenvironm Protect, Shanghai 201403, Peoples R China

3.Connecticut Agr Expt Stn, Dept Analyt Chem, New Haven, CT 06504 USA

关键词： Carbon nanomaterial; Alkyl PAH; Bioaccumulation; Oxidative stress

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：5.909； 五年影响因子：5.649 ）

ISSN： 2213-2929

年卷期： 2018 年 6 卷 5 期

页码：

收录情况： SCI

摘要： Carbon nanomaterials (CNMs) are increasingly released to the terrestrial system, but information on their environmental fate and risk is rather limited. Fullerenes (C-60) and two multi-walled carbon nanotubes (outer diameter < 8 nm: MW8; > 50 nm: MW50) were added to soil to evaluate their impact on bioaccumulation and oxidative response of phenanthrene, 3-methylphenanthrene and 3,6-dimethylphenanthrene by the geophagous earthworm Metaphire guillelmi under single-(F1), bi-(F2) and tri-contaminant (F3) systems. High-sorption CNMs exhibited lithe or suppression effect on phenanthrene and 3-methylphenanthrene bioaccumulation, whereas these treatments stimulated 3,6-dimethylphenanthrene bioaccumulation (6.1-25.9%), indicating a dissimilar role of CNMs on contaminant uptake as a function of analyte type. Compared to the single-contaminant system, the alleviated suppression effect of certain CNM treatments on bioaccumulation of both compounds in F2 system, as well as the sorption-and dose-dependent bioavailability of two methylphenanthrenes in F3 system revealed significant and dissimilar molecular interactions in multi-contaminant systems. CNMs mitigated the synergetic bioaccumulation of three compounds except for 3,6-dimethylphenanthrene under MW8 co-exposure. Oxidative stress did occur in all three systems but only high-level CNMs in F3 system triggered significant damage with considerable MDA (malondialdehyde) generated in earthworms. This study provides insight into CNM-contaminant exposure and risk under environmentally relevant scenarios and highlights the importance of considering these complexities when assessing overall risk.

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