Biosolids inhibit bioavailability and plant uptake of triclosan and triclocarban

WATER RESEARCH

卷:102

Article

Fu, Qiuguo^1,2  Wu, Xiaoqin^1,3  Ye, Qingfu²  Ernst, Fredrick¹  Gan, Jay¹ 

[1] Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA

[2] Zhejiang Univ, Inst Nucl Agr Sci, Hangzhou 310029, Zhejiang, Peoples R China

[3] Lawrence Berkeley Natl Lab, Ecol 1 Cyclotron Rd, Berkeley, CA 94720 USA

关键词: Biosolids;    Triclosan;    Triclocarban;    PPCPs;    Plant uptake;    Bioavailability;   

DOI  :  10.1016/j.watres.2016.06.026

来源: Elsevier

【 摘 要 】

Biosolids from wastewater treatment are primarily disposed of via land applications, where numerous pharmaceuticals and personal care products (PPCPs) may contaminate food crops and pose a human exposure risk. Biosolids are rich in organic carbon and addition of biosolids can increase the sorption of certain PPCPs in soil, decreasing their bioavailability. This study tested the hypothesis that the relative plant uptake of PPCPs decreases with increasing biosolids amendment. Accumulation of triclosan and triclocarban was measured in roots of radish and carrot grown in soils with or without biosolids. Addition of biosolids significantly-prolonged the persistence of triclosan in soil. When expressed in bioaccumulation factor (BCF), accumulation of triclosan drastically decreased in biosolids-amended soils, while the effect was limited for triclocarban. Compared to the unamended soil, amending biosolids at 2% (w/w) decreased BCF of triclosan in the edible tissues of radish and carrot by 85.4 and 89.3%, respectively. Measurement using a thin-film passive sampler provided direct evidence showing that the availability of triclosan greatly decreased in biosolids-amended soils. Partial correlation analysis using data from this and published studies validated that biosolids decreased plant uptake primarily by increasing soil organic carbon content and subsequently sorption. Therefore, contamination of food crops by biosolids-borne contaminants does not linearly depend on biosolids use rates. This finding bears significant implications in the overall risk evaluation of biosolids-borne contaminants. (C) 2016 Elsevier Ltd. All rights reserved.

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