RT Report T1 Phosphine and Selected Metal Phosphides: Environmental Health Criteria 73 A1 United Nations Environment Programme, A1 World Health Organization, A1 International Labour Organisation, K1 environmental health K1 chemical K1 metal K1 terrestrial ecosystem K1 aquatic ecology K1 micro-organism K1 aluminium K1 magnesium K1 zinc SN 92 4 154273 X YR 1988 FD 1988 LK https://wedocs.unep.org/handle/20.500.11822/29370 UL https://wedocs.unep.org/handle/20.500.11822/29370 NO Phosphine, or hydrogen phosphide, is a colourless gas which is odourless when pure, but the technical product usually has a foul odour, described as "fishy or "garlicky", because of the presence of substituted phosphines and diphosphine (P2H4). Other impurities may be methane, araine, hydrogen, and nitrogen. For fumigation, it is produced at the Site by hydrolysis of a metal phosphide and supplied in cylinders either as pure phosphine or diluted with nitrogen. Aluminium, magnesium (trimagnesium diphosphide) , and zinc (trizinc diphosphide) phosphides are the most commonly used metal phosphides for this purpose. DS UN Environment Document Repository RD Sep 16, 2026