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EC number: 201-297-1
CAS number: 80-62-6
The aerobic degradation of 14C-methyl methacrylate after application to
a Milton sandy loam soil has been studied at two application rates (100
and 1000 mg/kg dry weight soil). After application at either rate,
methyl methacrylate was rapidly lost from the soil by a combination of
evaporative and degradative processes. The estimated half-life for
methyl methacrylate in soil was less than one day.
Volatile radioactivity, other than that characterised as 14C02 , was
assumed to be associated with the parent compound. Although the study
was designed to minimise evaporation of methyl methacrylate, it was still
expected to be significant in view of the highly volatile nature of the
compound. After application at 100 and 1000 mg/kg, evaporation of
unchanged methyl methacrylate was estimated to account for about 60%
and 70 % of the applied radioactivity respectively. Almost all of this
evaporation occurred during the first day after application.
Mineralisation to 14CO2 accounted for 28% of the 100 mg/kg application
and 16% of the 1000 mg/kg application after 28 days. Production of 14C02
occurred mostly during the first three days after
application and was more rapid (in terms of % applied radioactivity)
after application at 100 mg/kg.
Degradation to non-volatile, non-extractable material accounted for
about 5 % of the low level application and 2 % of the high level
application after 28 days.
Methacrylic acid was present as an impurity in the applied methyl
methacrylate and was detected in the zerotime soil extracts. Tue
proportion of methacrylic acid in soil declined rapidly suggesting that
it also was degraded or volatilised.
In a guideline study in accordance to U.S.-EPA already after 2 days < 1
% of the radioactivity was left as methyl methacrylate
in soil extracts, at either rate of application. About
60 - 70 % of the radioactivity was lost due to
evaporation of the parent compound at both concentration levels. Of the
total volatiles measured, 28.2 (low level) and 15.7
(high methyl methacrylate level) of applied compound
over the 28-day study period was accounted to CO2 emissions.
The indications are that methyl methacrylate is rapidly lost from
soil either by evaporation or degradation. The estimated half-life for
methyl methacrylate in soil was less than one day at both concentration
levels. In addition, the test substance shows low adsorptive properties
(log Koc 1.1) and is readily biodegradable.
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