RT null T1 Monitoring of PFOS in Water – Africa Region A2 Fiedler, Heidelore K1 water K1 Africa YR 2018 FD 2018 LK https://wedocs.unep.org/handle/20.500.11822/26099 UL https://wedocs.unep.org/handle/20.500.11822/26099 DS UN Environment Document Repository RD Sep 16, 2026