A full mass balanced laboratory aerobic degradation study was conducted at 20°C and 40% MWHC on NIven sandy loam. Three additional studies on differing soils were also performed at 20°C with a further study, also performed on the Niven sandy loam at 10°C. The pH of the four soils used ranged from 6.6 – 7.1 when measured in water. This is a smaller range than normally required according to the Annex II data requirements. Although tri-allate was stable to aqueous hydrolysis at pH 7 significant aqueous hydrolysis did occur at pH 9. In situations where degradation is expected to be pH dependent the RMS would expect such studies to cover a range of pH’s, including approximately pH 8. However hydrolysis would be expected to increase the rate of degradation in alkaline soils, and therefore the range of soils selected to study the rate of degradation may be considered conservative with respect to their pH. Overall the information submitted by the Notifier was considered acceptable by the RMS. Six metabolite peaks were observed in the full mass balance study conducted on Niven sandy loam. Though none of the metabolites were present at concentrations greater than 5% AR, one was identified as TCPSA. A seventh metabolite peak was observed in the additional non-mass balanced studies. Unextractable radioactivity, 14CO2, and organic volatiles (which were not characterized, but were assumed by the Notifier to be tri-allate due to its relatively high vapour pressure) all increasing during the 120 day experiment reaching maximum concentrations at 120 days of 25.29% AR, 21.24% AR and 16.17% AR respectively.