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EC number: 446-990-1
CAS number: -
ready biodegradation studies (OECD 301D) have been performed on the
registered substance (active substance: in a solid state). In these
studies, a total of 35% and 45% degradation were reached respectively.
These results correspond well with a predicted total mineralisation of
the xylitol and anhydro-xylitol fractions. Nevertheless, employing the
low inoculum concentration required to meet OECD 301D guideline
recommendations, the bacteria may not have had the time to adapt to the
larger constituents of the mixture during the timeframe of this study.
From the previous information and the BIOWIN prediction of
biodegradation of the different components of the registered substance,
we would expect Xylitol, anhydro-xylitol and xylityl monoglucoside to be
biodegraded in a ready test, at least when tested individually. It is
recognised that "mixtures" containing a homologous series of
constituents may take longer to biodegrade than single substances (as
mentioned in the decision scheme of the CLP guidance (20135)). This is
due to the increased lag time as the competent degraders move from one
available food source to another. Then two additional ready
biodegradability tests were performed with the registered substance in
water (corresponding to the commercial product); this corresponds to the
physical state (liquid form) in which the substance will end up in the
environment. In the first assay, the batch tested (83.97% dry matter)
reached 69-73% in 28 days (10 day window reached) according to the OECD
test n° 301F.
the second assay (performed according to OECD test n° 301D), the
commercial product reached 65 and 63% biodegradation with two types of
inoculum (sludge from STP and river water, respectively) in 28 days and
68% biodegradation in 60 days (with river water as inoculum). As
the registered substance is a multi-constituent substance in homologous
the 10 days-window does not need to be satisfied to be "readily biodegradable"
on the application of the CLP criteria, version 5.0: II.2.1.2, page 564).
So the registered substance is considered "readily biodegradable".
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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