Commercial compost amendments inhibit the bioavailability and plant uptake of per- and polyfluoroalkyl substances in soil-porewater-lettuce systems

文献类型： 外文期刊

第一作者： Li, Yuanbo

作者： Li, Yuanbo;Li, Yuanbo;Broome, Stephen W.;Duckworth, Owen W.;Zhi, Yue;Weed, Rebecca;Knappe, Detlef R. U.;Zhi, Yue;Li, Yuanbo

作者机构：

关键词： PFAS; Commercial compost; Plant uptake; Bioavailability; Soil porewater

期刊名称：ENVIRONMENT INTERNATIONAL （ 影响因子：11.8； 五年影响因子：12.4 ）

ISSN： 0160-4120

年卷期： 2024 年 186 卷

页码：

收录情况： SCI

摘要： Compost is widely used in agriculture as fertilizer while providing a practical option for solid municipal waste disposal. However, compost may also contain per- and polyfluoroalkyl substances (PFAS), potentially impacting soils and leading to PFAS entry into food chains and ultimately human exposure risks via dietary intake. This study examined how compost affects the bioavailability and uptake of eight PFAS (two ethers, three fluorotelomer sulfonates, and three perfluorosulfonates) by lettuce (Lactuca sativa) grown in commercial organic compost-amended, PFAS spiked soils. After 50 days of greenhouse experiment, PFAS uptake by lettuce decreased (by up to 90.5 %) with the increasing compost amendment ratios (0-20 %, w/w), consistent with their decreased porewater concentrations (by 30.7-86.3 %) in compost-amended soils. Decreased bioavailability of PFAS was evidenced by the increased in-situ soil-porewater distribution coefficients (K-d) (by factors of 1.5-7.0) with increasing compost additions. Significant negative (or positive) correlations (R-2 >= 0.55) were observed between plant bioaccumulation (or K-d) and soil organic carbon content, suggesting that compost amendment inhibited plant uptake of PFAS mainly by increasing soil organic carbon and enhancing PFAS sorption. However, short-chain PFAS alternatives (e.g., perfluoro-2-methoxyacetic acid (PFMOAA)) were effectively translocated to shoots with translocation factors > 2.9, increasing their risks of contamination in leafy vegetables. Our findings underscore the necessity for comprehensive risk assessment of compost-borne PFAS when using commercial compost products in agricultural lands.

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