RT null T1 World Chlorine Council K1 mercury YR 2009 FD 2009-04 LK https://wedocs.unep.org/handle/20.500.11822/12746 UL https://wedocs.unep.org/handle/20.500.11822/12746 NO World Chlorine Council NO https://www.unep.org/chemicalsandwaste/Portals/9/Mercury/Documents/PartneshipsAreas/PartneshipsLetters/World%20Chlorine%20council.pdf DS UN Environment Document Repository RD Sep 20, 2026