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EC number: 201-051-3
CAS number: 77-71-4
DMH was steadily degraded at 20 °C in the absence of light giving whole system and aqueous phase DT50 values of 13 to 24 days and DT90 values of 42 to 79 days. After 17 weeks, 65% of initial radioactivity was mineralised to CO2.
The key study (de Vette and Schoonmade, 2002) has been performed to an
appropriate guideline under GLP in an artificial water/sediment system
and a natural system for a period of 120 days. DMH is a polar molecule
and was expected to be retained mainly in the surface water phase and be
exposed to predominently aerobic conditions. The fastest degradation
rates were observed in the water rather than the whole system. 90 %
degradation of DMH was observed after 42 to 79 days in the two
water/sediment systems with more rapid degradation in the natural system
. 50 % degradation of DMH was observed after 13 to 24 days for both
systems. The most environmentally relevant half life in water was 12.7
days in the natural water.
There are two supporting studies for aerobic and anaerobic degradation
performed to old EPA guidelines which have been superseded by OECD 308
(Schmidt, 1993 and Schmidt & Stansbrey, 1993). Both studies were
performed on a single sediment type and the study methods have clearly
defined limitations. The Schmidt & Stansbrey study indicated the
formation of at least two unidentified degradation products under
anaerobic conditions after one year. In the aerobic study (Schmidt,1993)
only a small amount of DMH mineralisation to CO2 (<6% of initial
measured dose) after one year under aerobic conditions.
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