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EC number: 273-227-8
CAS number: 68953-84-4
1) Key: Biodegradation in soil with one of the constituents of DAPD (R-898; CAS 15017-02-4), K1, GLP, according to USEPA guideline, indicative of strong binding behaviour to soil
There is one test available that
describes the environmental fate in soil of one of the main constituents
of 1,4 -benzenediamine, N,N’-mixed Ph and tolyl derivs (R-898; CAS 15017
-02 -4)(McLaughlin, 1997). It regards a terrestrial field soil
dissipation test in which 14-C labelled
N,N’-bis(2-methylphenyl)benzene-1,4-diamine (CAS 15017 -02 -4) is added
onto the top surface of soil cylinders of 8 inches in diameter.
The use of
the N,N'-di-o-tolyl-p-phenylenediamine component as surrogate for the
submission substance is based upon its structural similarities to other
components of the submission substance 1,4-benzenediamine, N,N'-mixed Ph
and tolyl derivs. This component was selected based upon its
availability as radioactive material plus modelling results indicate it
to be least susceptible to biodegradation, providing worst-case outcome
for the submission substance. Soil
samples were collected over a period of 362 days post application. Four
measurements were made on each soil sample: total 14-C, solvent
extractable 14-C, unextractable 14-C, and the extract fraction was
checked on its test substance content. The extractable levels of test
substance and total extractable radioactivity both showed a strong
decrease on day 362.
More specifically, the test results
demonstrated that most (~98%) of the 14-C labelled material remained in
the top 3 inches of the soil. In total, 46% of the applied radioactivity
was present in the top soil layer after 362 days, suggesting that 54% is
lost due to volatilization or degradation. Migration below the 3 inch
level was shown to be minimal. The amounts of recovered test substance
as % of the total radioactivity present in the top 3 inches level at the
study’s initiation and termination where 49 and 0.7%, respectively.
Unextractable 14-C increased from 43% on day 0 to 91% on day 362. The
DT50 appear to be 10.8 days (calculated over exposure duration day 0 to
day 32) and 66.5 days (calculated over exposure duration from day 0 to
day 362)The results indicate that the test compound or its degradate(s)
strongly binds to soil, thus attenuating its potential bioavailability
as well as its migration from soil to ground water.
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