| Budget Amount *help |
¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
Fiscal Year 2020: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
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| Outline of Final Research Achievements |
Perfluorooctanesulfonate (PFOS) and related perfluoroalkyl substances (PFAS) have been revealed as ubiquitous contaminants in the open environment. The most important nature of PFOS and perfluorooctanoic acid (PFOA) was “persistence” in the environment. Although several hypotheses regarding biological/ environmental breakdown (secondary formation) from precursors such as FTOHs (fluorotelomer alcohols) to PFOS and PFOA have been suggested, the evidence of photodegradation of perfluorosulfonic acids (PFSAs) and perflurocalboxylic acids (PFCAs) themselves in the environment is not available to date. To elucidate photodegradation of PFAS that received intensive solar radiation, aqueous solutions of individual PFAS were exposure to solar radiation under three times of artificial UV irradiation (high irradiance experiments) and under natural environmental conditions (filed experiment).
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