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EC number: 202-908-4
CAS number: 101-02-0
Theoretical oxygen demand (ThOD)
The calculated theoretical oxygen demand (ThOD) of triphenyl phosphite
is 2.2 mg/mg. The ThOD of sodium acetate is 0.8 mg/mg
Inhibition of the degradation of a well-degradable compound, e.g. sodium
acetate by the test substance in the Closed Bottle test was not
determined because possible toxicity of triphenyl phosphite to
microorganisms degrading acetate is not relevant. Inhibition of the
endogenous respiration of the inoculum by the test substance at day 7
was not detected . Therefore, no inhibition of the biodegradation due to
the "high" initial test substance concentration is expected.
The pH of the media was 7.3 at the start of the test. The pH of the
medium at day 28 was 7.3 (both controls), and 7.1 (test). Temperatures
were within the prescribed temperature range of 22 to 24°C.
Validity of the test
The validity of the test is demonstrated by an endogenous respiration of
0.9 mg/L at day 28. Furthermore, the differences of the replicate values
at day 28 were less than 20%. The biodegradation percentage of the
reference compound, sodium acetate, at day 14 was 83%. Finally, the
validity of the test is shown by oxygen concentrations >0.5 mg/L in all
bottles during the test period.
TPP was 84% biodegradable in a 28 -day ready biodegradation study using
OECD 301D (closed bottle test). The results also passed the 10 -day
window of 60% biodegradation during the first week of the study. TPP
will be classified as readily biodegradable based on these results.
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