RT null
T1 Thallium and Thallium Compounds Health and Safety Guide 102
A1 United Nations Environment Programme, 
A1 World Health Organization, 
A1 International Labour Organisation, 
K1 health
K1 toxic substance
K1 health hazard
K1 waste disposal
SN 92 4 151102 8
YR 1996
FD 1996
LK https://wedocs.unep.org/handle/20.500.11822/29647
UL https://wedocs.unep.org/handle/20.500.11822/29647
NO Thallium is a soft and malleable heavy metal with a bluish-white colour. Its relative molecular mass is 204.38. Its most important compound is the colourless, odourless and tasteless thallium(l) sulfate, previously used on a large scale as a rodenticide. Monovalent (thallous) compounds behave like, and may be as reactive as, alkali metals, e.g., potassium, whereas the trivalent (thallic) compounds are less basic, resembling aluminium.
DS UN Environment Document Repository
RD Sep 23, 2026