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EC number: 200-661-7
CAS number: 67-63-0
The substance has a BOD5/ThOD ratio of 0.50, and is therefore considered to be readily degradable.
The BOD5 (non-adapted), BOD5 (adapted) and COD of the substance
were reported by Bridié et al. (1979) to be 1.19 g O2/g, 1.72 g O2/g and
2.23 g O2/g, respectively. The BOD test was conducted in accordance
with the standard dilution method (APHA "Standard Methods" No. 219
(1971)) at 20 ± 1ºC for a period of 5 days. The only deviation from the
APHA standard was the addition of 0.5 mg/l allylthiourea in each test to
prevent nitrification. 500 ml test solutions were seeded with a filtered
10 ml volume of the effluent from a biological sanitary waste treatment
plant. The authors reported that in some cases an adapted seed was
prepared and used, although in no case was inducement of adaptation
tried exhaustively. Duplicate tests were run on a mixture of glucose and
glutamic acid, as recommended in the APHA method, as a means of checking
the activity of the inoculum. The COD test was conducted in accordance
with the standard potassium dichromate method described in ASTM D 1252
-97 (reapproved 1974). The BOD5/COD ratios from these results are 0.53
(non-adapted) and 0.77 (adapted). As indicated in the REACH Endpoint
Specific Guidance section R.126.96.36.199; where no
other measured degradability data are available,BOD5 datacan
be used for classification purposes, but where the chemical structure is
known, a calculated theoretical oxygen demand (ThOD) value should be
used instead of the COD. According
to Annex IV of OECD 301, the ThOD of this substance can be calculated to
be 2.40 g O2/g, which gives BOD5/ThOD ratios of 0.50
(non-adapted) and 0.72 (adapted). The
value for non-adapted seed equals 0.5, at which level or above a
substance can be considered to be readily degradable.
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