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EC number: 205-597-3
CAS number: 143-28-2
Significant technical difficulties were encountered during method development for a recent study of adsorption/desorption (OECD 106, Wildlife, 2015) of the structurally analogous alcohol, decan-1-ol (CAS 112-30-1), using natural standard soils, in that it was not possible to detect sufficient substance and establish equilibrium in non-sterilised soil samples. During method development in preparation for this study, the laboratory reported that after equilibration with soils for 15-minute to 24-hour periods, decan-1-ol dosed into the test vessels was partly or completely transformed into a more polar product, which was clearly distinguishable from the starting material as clear and well separated peaks in the chromatograms. The rate of transformation depends on the soil type. Only after a very short (5-minute) equilibration the parent material remained intact (personal communication, 8 January 2015 from Wildlife International laboratory). Half-lives were not explicitly derived, but chromatograms presented would indicate the half-life of decan-1-ol in the soil test samples was approximately 30 min - 1 hour (silt loam soil); 1 - 2 hours (loamy sand), and 15 - 30 minutes (clay loam). Following sterilisation of the soil samples by autoclaving, the substance remained adequately stable for a 2-hour period, therefore the instability can be attributed to biodegradation of the substance by soil microbiota. The polar degradation product is most likely the corresponding carboxylic acid, though it was not definitively identified. The chromatograms show that decan-1-ol was effectively fully removed in all four soil types by the 24 h time point (in the case of 2 of the soil types, within 2 hours). Similar degradation can be expected for (Z)-octadec-9-enol.
In accordance with Column 2 of REACH Annex
IX, the full soil simulation test (required in Section 188.8.131.52) does not
need to be conducted as the substance is readily biodegradable.
Furthermore a close structural analogue, decan-1 -ol (CAS 112-30-1), has
been shown to be very rapidly degraded in non sterilised standard soils
as part of method development for the soil adsorption study.
Discussion of trends in the Category
of C6-24 linear and essentially-linear aliphatic alcohols
The data available regarding persistence in
soil are limited. A commercial multi-constituent substance (CAS
68155-00-0 (C14-18 and C16-18 unsaturated) and CAS 68002-94-8 (C16-18
and C18 unsaturated)) was found to be readily biodegradable in a
reliable OECD 301D study using a non-standard inoculum; garden soil
microorganisms (Borner, 1999). A recent and reliable study of adsorption
and desorption using the batch equilibrium method (in compliance with
OECD 106 and GLP) has been conducted with decan-1-ol (CAS 112-30-1).
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