Maine Center for Disease Control and Prevention, 286 Water Street, 11 State House Station, Augusta, Maine 04333, United States.
Maine Department of Environmental Protection, 32 Blossum Lane, 17 State House Station, Augusta, Maine 04333, United States.
J Agric Food Chem. 2024 Oct 23;72(42):23108-23117. doi: 10.1021/acs.jafc.4c02078. Epub 2024 Oct 8.
Models to predict perfluorooctanesulfonic acid (PFOS) concentrations in livestock based on soil concentrations are essential to guide decisions surrounding food testing and farm management. A key parameter in modeling soil-to-livestock exposure pathways is the plant transfer factor (TF) from soil into forages. Uptake of PFOS and other individual per- and polyfluoroalkyl substances (PFASs) were examined in perennial mixed grasses and legumes on PFAS-contaminated farm fields. In a field plot study, PFOS TFs were similar within each plot over three consecutive years but varied 10-fold among the four plots with mean TFs ranging from 0.026 to 0.27. In a multifarm field survey study, mean PFOS TFs ranged from 0.039 to 0.37. Increasing concentrations of two PFOS precursors in soil were significantly associated with increasing PFOS TFs. These data represent a substantial increase in empirical observations of PFAS TFs for grass-based forages for use in modeling soil-to-livestock exposure scenarios.
基于土壤浓度预测牲畜中全氟辛烷磺酸（PFOS）浓度的模型对于指导食品检测和农场管理决策至关重要。模拟土壤-牲畜暴露途径的关键参数是植物从土壤到饲料的转移因子（TF）。在受全氟烷基和多氟烷基物质（PFAS）污染的农田中，研究了多年生混合草和豆科植物对 PFOS 和其他个别 PFAS 的吸收情况。在田间试验研究中，三个连续年内每个试验点的 PFOS TF 相似，但四个试验点之间相差 10 倍，平均 TF 范围为 0.026 至 0.27。在多农场田间调查研究中，PFOS TF 的平均值范围为 0.039 至 0.37。土壤中两种 PFOS 前体浓度的增加与 PFOS TF 的增加呈显著正相关。这些数据代表了用于模拟土壤-牲畜暴露情景的基于草的饲料中 PFAS TF 的经验观察的大幅增加。
