The University of Queensland, National Research Centre for Environmental Toxicology, (Entox), Coopers Plains, Brisbane, Queensland, Australia.
The University of Queensland, National Research Centre for Environmental Toxicology, (Entox), Coopers Plains, Brisbane, Queensland, Australia.
J Hazard Mater. 2015 Oct 15;296:46-53. doi: 10.1016/j.jhazmat.2015.03.007. Epub 2015 Mar 21.
The present study investigates the occurrence and fate of 15 perfluoroalkyl substances (PFASs) and one fluorotelomer sulfonate from a firefighting training ground (FTG) that was contaminated by intensive use of aqueous film forming foams (AFFF). The contamination levels and their spatial and vertical distribution are assessed in the structure. At the surface of the pad, perfluorooctane sulphonate (PFOS) is the dominant PFASs measured, with concentration varying from 10 to 200 μg g(-1). PFASs were also detected in a concrete core at up to 12 cm depth, suggesting the vertical movement and higher transport potential of shorter chain compounds. The estimated mass load of linear PFOS in this specific pad was >300 g with a total of 1.7 kg for the sum of all PFASs analyzed. The kinetics of desorption of PFOS, PFOA and 6:2FTS from the concrete into an overlaying static water volume has been measured under field conditions at two constant temperatures. Fitting the desorption data and estimated rainfall/runoff to a kinetic model suggests that this and similar firefighting training pads will likely remain a source of PFASs for many decades (t0.5=25 years for PFOS).
本研究调查了一个消防训练场地（FTG）中 15 种全氟烷基物质（PFASs）和 1 种氟代烷烃磺酸盐的发生和归宿，该场地因大量使用水成膜泡沫（AFFF）而受到污染。评估了结构中污染水平及其空间和垂直分布。在垫的表面，测得的全氟辛烷磺酸（PFOS）是主要的 PFASs，浓度从 10 到 200 μg g(-1) 不等。在高达 12 厘米深的混凝土芯中也检测到了 PFASs，表明较短链化合物的垂直迁移和更高的迁移潜力。该特定垫中线性 PFOS 的估计质量负荷超过 300 g，分析的所有 PFASs 的总和为 1.7 kg。在两个恒定温度下，在现场条件下测量了 PFOS、PFOA 和 6:2FTS 从混凝土到覆盖静止水体积的解吸动力学。将解吸数据和估计的降雨/径流拟合到动力学模型表明，这种和类似的消防训练垫在未来几十年（PFOS 的 t0.5=25 年）内可能仍然是 PFASs 的来源。
