Per- and polyfluorinated substances (PFAS) are widely used industrial and household chemicals and occur on various contaminated field sites. To better understand their behavior on soils, spike experiments were performed with 6:2 diPAP (6:2 polyfluoroalkyl phosphate diester) on pure mineral phases (titanium dioxide, goethite and silicon dioxide) in aqueous suspensions under artificial sunlight. Further experiments were performed with uncontaminated soil and four precursor PFAS. Titanium dioxide (referenced as 100 %) showed the highest reactiveness to transform 6:2 diPAP to its primary metabolite 6:2 fluorotelomer carboxylic acid, followed by goethite with the addition of oxalate (4.7 %), silicon dioxide (1.7 %) and soil (0.0024 %). Experiments with four precursors [6:2 polyfluorinated alkyl phosphate diester (diPAP), 6:2 fluorotelomer mercapto alkyl phosphate (FTMAP), N-ethyl perfluorooctane sulfonamide ethanol–based phosphate diester (diSAmPAP), N-ethyl perfluorooctane sulfonamidoacetic acid (EtFOSAA)] on natural soils showed a transformation of all four precursors by simulated sunlight. The production of the primary intermediate from 6:2 FTMAP (6:2 FTSA, rate constant k = $2.7\ast {10}^{-3}{\mathrm{h}}^{-1}$) was approximately 13-times faster than from 6:2 diPAP (6:2 FTCA, rate constant k = $1.9\ast {10}^{-4}{\mathrm{h}}^{-1}$). EtFOSAA was completely decomposed within 48 h whereas only ~7 % diSAmPAP was transformed in the same time. The primary photochemical transformation product of diSAmPAP and EtFOSAA was PFOA, PFOS was not detected. The production rate constant of PFOA varied significantly between EtFOSAA (k = $0.01{\mathrm{h}}^{-1}$) and diSAmPAP (k = $1.3\ast {10}^{-3}{\mathrm{h}}^{-1}$). Photochemically produced PFOA consisted of branched and linear isomers and can therefore be used in source tracking. Experiments with different soils suggest that the oxidation of EtFOSAA to PFOA is expected to primarily be driven by hydroxyl radicals, whereas for the oxidation of EtFOSAA to further intermediates, another mechanism instead or in addition to the oxidation by hydroxyl radicals is responsible.

每- 多氟物质 (PFAS) 是广泛使用的工业和家用化学品，存在于各种受污染的现场。为了更好地了解它们在土壤中的行为，在人工阳光下的水悬浮液中，使用 6:2 diPAP（6:2 多氟烷基磷酸二酯）对纯矿物相（二氧化钛、针铁矿和二氧化硅）进行了加标实验。使用未受污染的土壤和四种前体 PFAS 进行了进一步的实验。二氧化钛（参考为 100%）显示出将 6:2 diPAP 转化为其主要代谢物 6:2 含氟调聚物羧酸的最高反应性，其次是添加草酸盐（4.7%）、二氧化硅（1.7%）和土壤的针铁矿(0.0024%)。使用四种前体 [6:2 多氟烷基磷酸二酯 (diPAP), 6 进行的实验：2 氟调聚物巯基烷基磷酸盐 (FTMAP)、N-乙基全氟辛烷磺酰胺乙醇基磷酸二酯 (diSAmPAP)、N-乙基全氟辛烷磺酰胺乙酸 (EtFOSAA)] 在天然土壤上显示出所有四种前体在模拟阳光下的转化。从 6:2 FTMAP（6:2 FTSA，速率常数k =$2.7*{10}^{-3}{\mathrm{H}}^{-1}$）比 6:2 diPAP（6:2 FTCA，速率常数k =$1.9*{10}^{-4}{\mathrm{H}}^{-1}$）。EtFOSAA 在 48 小时内完全分解，而同时仅约 7% diSAmPAP 被转化。diSAmPAP和EtFOSAA的主要光化学转化产物是PFOA，未检测到PFOS。EtFOSAA 之间 PFOA 的生成速率常数差异显着 ( k =$0.01{\mathrm{H}}^{-1}$) 和 diSAMPAP ( k =$1.3*{10}^{-3}{\mathrm{H}}^{-1}$）。光化学生产的 PFOA 由支链和直链异构体组成，因此可用于源跟踪。对不同土壤的实验表明，EtFOSAA 氧化成 PFOA 预计主要是由羟基自由基驱动的，而对于 EtFOSAA 氧化成进一步的中间体，则有另一种机制代替或除了羟基自由基的氧化之外。