RT Report
T1 Methomyl - Environmental Health Criteria 178
A1 World Health Organization, 
K1 health
K1 chemical
K1 toxic substance
K1 biodegradation
SN 92 4 157178 0
YR 1996
FD 1996
LK https://wedocs.unep.org/handle/20.500.11822/29806
UL https://wedocs.unep.org/handle/20.500.11822/29806
NO Methomyl is a white crystalline solid with a melting point of 77 °C and a vapour pressure of 0.72 mPa (25°C ). Its solubility in water is 54.7 g/litre and its octanol/water partition coefficient (K) is 1.24. It is stable in sterile water at p1-1 7, but is broken down at higher pH values, the half-life being 30 days at pH 9 and 25°C.
DS UN Environment Document Repository
RD Sep 16, 2026