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EC number: 267-051-0
CAS number: 67774-74-7
test substance was 64.1% degraded at the end of 28 days. The test
substance met the 10 -day window and is therefore considered readily
The ready biodegradability of the test
substance, was determined using the manometric respirometry test. A
measured volume of inoculated medium with a known amount of test
substance is stirred in a closed flask. The consumption of oxygen is
determined from the reduction in volume of the air contained in the
apparatus. Evolved CO2 is adsorbed to soda lime and the amount of oxygen
taken up by the substance (corrected for the blank) is expressed as a
percentage of the theoretical oxygen demand calculated from the formula
of the compound. A reference substance (sodium benzoate) was run in
parallel to ensure viability of the inoculum. The test substance was
64.1% degraded at the end of 28 days. The test substance met the 10 -day
window and is therefore considered readily biodegradable. In accordance
with the OECD Guidelines for Testing of Chemicals Revised Introduction
to Section 3 Tests, Item 43, the 10 -day window criterion is not
applicable because of the sequential degradation of different components
fo the mixture. Therefore, LAB is readily biodegradable.
Concentrations of 100 ppb or 500 ppb were
added to samples of 500 ml of natural river water. Concentrations of
various substance isomers were determined weekly. Total exposure was 42
days. At the end of this period, the substance was almost completely
biodegraded (<96%). The half-life was 4 days for the 100 ppb initial
concentration, and 9 days for the 500 ppb initial concentration. This
shows that substance degrades more quickly at lower concentrations.
The substance is readily biodegradable. The ready biodegradation of the substance was determined in an OECD 301F guideline study.
The ready biodegradation of the substance
was determined in an OECD 301F guideline study (manometric respirometry
test). The substance reached 6.1% biodegradation in 28 days and passed
the 10 day window. The substance is readily biodegradable.
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