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EC number: 278-855-6
CAS number: 78169-20-7
The substance is readily biodegradable.
ready biodegradability of the Sulfonium compound mixture was tested in
two GLP guideline studies according to OECD 301 B (Ready
Biodegradability: CO2 Evolution Test) [BASF AG, 2003; BASF SE, 2013].
The biodegradation rate was determined by measuring the CO2 evolution of
non-adapted domestic activated sludge at the test substance
concentration of 20 mg/L and 38 mg/L, respectively.
substance is a mixture of similar Sulfonium compounds. Degradation of
mixtures is characterized by multiphase kinetics. In such cases the
10-day time-window criterion is not scientifically justified. It is
recommended that mixtures of similar compounds, which exceed the pass
level within the standard test duration of 28 days are considered as
“readily biodegradable”, independent from the 10-day time-window
the described mixture the result of the two biodegradation tests differs
considerable. One test results in a biodegradation rate of less than 10%
[BASF SE, 2013], whereas the degradation rate in the other study exceeds
the pass level of 60% [BASF AG, 2003]. Based on the stringent test
conditions of ready biodegradability tests, the guidance documents
declare: “Realising that ready biodegradability tests may sometime fail
because of the stringent test conditions, in general, and the
differences among the individual tests in terms of their stringency,
consistent positive test results from test(s) should generally supersede
negative test results” [ECHA Guidance on information requirements and
chemical safety assessment Chapter R. 7b, 2012].
it can be concluded from the available data, that the substance is
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