The environmental fate of 2,4-DNOPC was investigated in a number of laboratory studies using phenyl ring-labelled material. Results of the laboratory route of aerobic degradation carried out at 10 and 20°C are available for 2,4-DNOPC in 2 different soils. Degradation studies by Whittle (1998) and Lewis (1995) were conducted in compliance with the current guidelines and showed that 2,4-DNOPC was degraded to 2,4-DNOP by hydrolysis with further incorporation into soil and the formation of CO2. The major metabolite, 2,4-DNOP, occurred under aerobic conditions up to a maximum of 22% AR. High levels of unextractable residues (up to 43% in Whittle, 42% in Lewis) occurred by study end. Polar metabolites occurred up to 31.7% by day 7, decreasing to 4.4% by day 30 in Whittle (one soil). These compounds were not further characterised. However, polar materials and other minor components did not exceed 10% AR in the soil tested in Lewis. The study in anaerobic soil showed that up to 13% polar material occurred by day 7. These were further characterised into a maximum of 15 components, of which none exceeded 3.2% AR. A study (Corden, 2001) investigating the degradation of 2,4-DNOP in 3 soil types has been submitted, and was evaluated by the Austrian RMS in the Addendum for dinocap. 2,4-DNOP degraded mainly to bound residues, CO2 and small (<5%) amounts of polar compounds.