Per- and Polyfluoroalkyl Substances in Outdoor and Indoor Dust from Mainland China: Contributions of Unknown Precursors and Implications for Human Exposure,Environmental Science & Technology

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Per- and Polyfluoroalkyl Substances in Outdoor and Indoor Dust from Mainland China: Contributions of Unknown Precursors and Implications for Human Exposure
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-03-26 , DOI: 10.1021/acs.est.0c08242
Bin Wang ₁ , Yiming Yao ₁ , Yu Wang ₁ , Hao Chen ₁ , Hongwen Sun ₁

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Per- and polyfluoroalkyl substances (PFASs) were analyzed in outdoor (n = 101) and indoor dust (n = 43, 38 paired with outdoors) samples across mainland China. From 2013 to 2017, the median concentration of ∑PFASs in outdoor dust tripled from 63 to 164 ng/g with an elevated contribution of trifluoroacetic acid and 6:2 fluorotelomer alcohol. In 2017, the indoor dust levels of ∑PFASs were in the range 185–913 ng/g, which were generally higher than the outdoor dust levels (105–321 ng/g). Emerging PFASs were found at high median levels of 5.7–97 ng/g in both indoor and outdoor dust samples. As first revealed by the total oxidized precursors assay, unknown perfluoroalkyl acid (PFAA)-precursors contributed 37–67 mol % to the PFAS profiles in indoor dust samples. A great proportion of C8 PFAA-precursors were precursors for perfluorooctanesulfonic acid, while C6 and C4 PFAA-precursors were mostly fluorotelomer based. Furthermore, daily perfluorooctanoic acid (PFOA) equivalent intakes of PFAAs (C4–C12) mixtures via indoor dust were first estimated at 1.3–1.5 ng/kg b.w./d for toddlers at high scenarios, which exceeds the derived daily threshold of 0.63 ng/kg b.w./d. from the European Food Safety Authority (EFSA). On this basis, an underestimation of 56%–69% likely remains without considering potential risks due to the biotransformation of unknown PFAA-precursors.

更新日期：2021-03-26

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