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EC number: 701-197-2
CAS number: -
Ready Biodegradability_Manometric Respirometry Test_OECD 301F: 24 % degradation within 55 days exposure period (the substance is not readily biodegradable).
The test substance 1,2,3-Propanetriol,
glycidyl ethers was investigated for its ready biodegradability in a
manometric respirometry test over 55 days according to the OECD
Guideline 301 F, EU Method C.4‑D and US EPA Draft OPPTS 835.3110
(Paragraph (q)) (Eisner, 2013). In accordance with the testing
guidelines the test was prolonged to 55 days since the biodegradation
curve of the test item showed that biodegradation had started but the
plateau had not been reached by Day 28. The per cent biodegradation of
the test item was calculated based on the chemical oxygen demand of
1.54 mg O2/mg test item. The biochemical oxygen demand (BOD) of
1,2,3-Propanetriol, glycidyl ethers in the test media increased from
test start until test termination after 55 days. At Exposure Day 28 and
at test end after 55 days, the mean biodegradation of
1,2,3-Propanetriol, glycidyl ethers amounted to 13 % and 24 % of the
COD, respectively. Consequently, the test substance was considered as
not readily biodegradable under the test conditions. The pass level for
ready biodegradability, i.e. biodegradation of at least 60 % of the COD
in a 10‑day window within the 28‑day period of the test, was not
reached. In the toxicity control containing both1,2,3-Propanetriol,
glycidyl ethers and the reference item sodium benzoate, the run of the
curve of the oxygen consumption over the 55‑day exposure period was
similar but significantly higher than the one of the two procedure
controls, containing only the reference item. Within 14 days of
exposure, biodegradation amounted to 47 % and reaching 60 % at the end
of the test at Day 55. Thus, according to the test guidelines, the test
item had no inhibitory effect on activated sludge microorganisms at the
tested concentration of 101 mg/L because biodegradation in the toxicity
control was > 25 % within 14 days. In the procedure controls, the
reference item was degraded by an average of 81 % by Exposure Day 14,
thus confirming suitability of the activated sludge. At Day 28, the
reference item was degraded by an average of 87 % and by 91 % at the end
of test (Day 55).
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