Perfluoro alkyl acids (PFAAs) are known to bioconcentrate in plants grown in contaminated soils; the potential risk from consuming these plants is currently less understood. We determined that the current daily reference doses (RfDs) of the US Environmental Protection Agency (USEPA) could be met by consuming a single radish grown in soils with a perfluorooctanoic acid (PFOA) concentration of 9.7 ng/g or a perfluorooctane sulfonate (PFOS) concentration of 90.5 ng/g. Using a combination of our own research and literature data on plant uptake of PFAAs from soil, we developed equations for predicting PFAA bioconcentration factors (BCFs) for plant shoot and root tissues grown in soils with a known percentage of organic carbon. This calculated BCF was then applied to 6 scenarios with measured soil PFAA concentrations to estimate PFAA concentrations in plants and potential exposure to humans and animals consuming harvested vegetation. Five of the 6 scenarios showed potential for surpassing USEPA PFAA RfDs at soil concentrations as low as 24 ng/g PFOA and 28 ng/g PFOS. Environ Toxicol Chem 2021;40:832–845. © 2020 SETAC

中文翻译：

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土壤有机碳含量对土壤全氟烷基酸 (PFAA) 植物吸收的影响及其潜在的监管意义

众所周知，全氟烷基酸 (PFAA) 会在受污染土壤中生长的植物中进行生物浓缩；目前人们对食用这些植物的潜在风险知之甚少。我们确定，通过食用在全氟辛酸 (PFOA) 浓度为 9.7 ng/g 或全氟辛烷磺酸 (PFOS) 的土壤中生长的单个萝卜，可以满足美国环境保护署 (USEPA) 当前的每日参考剂量 (RfD) ) 浓度为 90.5 ng/g。结合我们自己关于植物从土壤中吸收 PFAA 的研究和文献数据，我们开发了用于预测在具有已知有机碳百分比的土壤中生长的植物芽和根组织的 PFAA 生物浓度因子 (BCF) 的方程。然后将此计算出的 BCF 应用于测量土壤 PFAA 浓度的 6 个场景，以估计植物中的 PFAA 浓度以及人类和动物消耗采伐植被的潜在暴露。6 种情景中的 5 种显示出在土壤浓度低至 24 ng/g PFOA 和 28 ng/g PFOS 时超过 USEPA PFAA RfD 的潜力。环境毒理学化学2021；40：832-845。© 2020 SETAC