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EC number: 271-974-4
CAS number: 68647-86-9
The Partition coefficient of the Water Accommodated Fraction of Coconut shell charcoal has been determined using a standard flask method. The logKow was found to be <1.2.Supporting tests (‘worst case’ approach) show that the WAF will not contain molecules which will individually have a log Kow value over 1.2.The logKow values found do not lead to concern for bioaccumulation.
The results are shown in the
Absorbance at (nm)
(Water Accommodated Fraction)
eq. water layer
eq. water blank
eq. water layer, nett
eq. octanol layer
eq. octonol blank
eq. octanol layer, nett
(Octanol Accommodated Fraction)
eq. octanol blank
The logKow values for the
WAF (Water Accommodated Fraction) of the substance is found to be -/-
The log Kow of the WAF is
practically independent from the wavelength at which the determination
is made. The WAF is thus found to be consistently hydrophilic. This
value does not lead to concern for bioaccumulation.
The logKow values for the
OAF (Octanol Accommodated Fraction) of the substance is found to range
from 1.2 to 0.1, depending of the wavelength used. It can be concluded
that the OAF consists of a range of molecules, whereby the more
conjugated molecules are more hydrophilic than the less conjugated
As per the Guidance
(Guidance on information requirements and chemical safety assessment,
Chapter R.7c: Endpoint specific guidance, chapter R.7.10.5.), organic
substances with log Kow below 3 are generally assumed not to be
The OAF can
be seen as an overestimation of the worst case for the molecules present
in the WAF. The highest value of log Kow found for the OAF (1.2) does
still not at all lead
to concern for bioaccumulation.
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