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EC number: 201-177-9
CAS number: 79-10-7
Acrylic acid was readily biodegradable in a
sandy loam soil under aerobic conditions at 25 °C in the dark. The DT50
under these conditions was estimated to be < 1 day.
well-documented and reliable test on biodegradation in soil, performed
according to U.S. EPA Pesticide Assessment Guidelines, Subdivision N, §
162- 1 is available (BAMM 1992). From the test design, the test can be
rated as a simulation test in soil.
metabolism of [14C]-acrylic acid (radiochemical purity 96 % by HPLC) in
a Milton sandy loam soil from Somersham, Cambridgeshire, U.K. has been
studied under aerobic conditions for up to 28 days after treatment. Soil
samples were incubated in darkness at 25 °C. The test substance was
applied to the soil at a rate of 100 mg/kg dw. Total recoveries of
radioactivity were in the range of 87 – 104 % of the amounts applied.
aerobic conditions acrylic acid was rapidly metabolised, after 3 days no
acrylic acid was detected in soil extracts. The half-life for acrylic
acid under these conditions was estimated to be less than 1 day. Carbon
dioxide evolution accounted for 72.9 % of applied radioactivity by Day 3
and a total of 81.1 % over the 28-day study period. Non-extractable
radioactivity peaked at 16.8 % of applied radioactivity by Day 3 and
decreased to 10.1 % by Day 28. Chromatographic analysis of soil extracts
revealed that most of the extractable radioactivity after Day 1 was
associated with highly polar material which was not further analysed.
trend exhibited by the metabolism of acrylic acid in soil was bi-phasic.
In the first phase, by Day 3, the vast majority (if not all) of the
[14C]-acrylic acid applied to the soil had been degraded. Most of the
radioactivity was mineralised to carbon dioxide. The remainder probably
became incorporated into soluble or insoluble organic material. The
soluble material was extracted and visualised by HPLC analysis. The
insoluble material remained bound. In the second phase the radiolabelled
organic material appeared to remain bioavailable, but it was metabolised
at a much slower rate (based on CO2 evolution data) so distinguishing it
from, the more labile acrylic acid.
the presented simulation test in soil it can be concluded that acrylic
acid is readily biodegradable in this soil type (sandy loam).
applicability of the comparatively short DT50 < 3 d to other soil types
and environmentally more relevant lower temperatures is not clear. Based
on all available data, also taking into account the low adsorption
potential of acrylic acid to soil, rapid biodegradation in soil under
environmental conditions can be expected.
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