RT null T1 Bi‐ennial Global Interlaboratory Assessment on POPs – Round 4: Appendix IV. z-Scores assessment A1 United Nations Environment Programme, K1 persistent organic pollutant YR 2021 FD 2021 LK https://wedocs.unep.org/handle/20.500.11822/36740 UL https://wedocs.unep.org/handle/20.500.11822/36740 NO Appendix IV z‐score assessment pesticides DS UN Environment Document Repository RD Sep 18, 2026