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T1 Alpha- and Betahexachlorocyclohexanes (Alpha- and Beta-HCHs) Health and Safety Guide
A1 United Nations Environment Programme, 
A1 World Health Organization, 
A1 International Labour Organisation, 
K1 health
K1 benzene
K1 chemical
SN 92 4 151053 6
YR 1991
FD 1991
LK https://wedocs.unep.org/handle/20.500.11822/29589
UL https://wedocs.unep.org/handle/20.500.11822/29589
NO a- and 13-HCH can be determined separately from the other isomers, by gas chromatography with electron-capture detection, and other methods, after extraction by liquid/liquid partition and purification by column chromatography. Biodegradation and abiotic degradation (dechlorination) by ultraviolet radiation (UVR) occur in the environment, with the production of delta-3,4,5,6-tetrachlorohexene, and pentachiorocyclohexene, respectively. The breakdown process is slower than in the case of lindane.
DS UN Environment Document Repository
RD Sep 22, 2026