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EC number: 205-597-3
CAS number: 143-28-2
The surface tension of (Z)-octadec-9-enol is 66.5 mN/m at 25°C and ca. 90% saturated aqueous solution. A preliminary assessment by calculated Hydrophilic Lipophilic Balance suggests that no surface tension lowering property would be expected on the basis of structure alone.
main purpose of determining surface tension is to assess whether a
substance is a surfactant and not able to have a log Kow test
done. The close structural analogue n-octanol is regularly used
with water in the classic two-phase partitioning experiment (e.g. OECD
Guideline 107). Octanol and all alcohols do phase-separate which
suggests that emulsification is not so strong as to create issues with
measurement of partitioning or other fate or effects studies.
reported measurement, for a highly pure sample, is at ca. 90% aqueous
solution based on the limit of solubility of the highly pure alcohol as
reported in the literature.
of trends in the Category of C6-24 linear and essentially-linear
derivatives of many of the alcohols in this group are products which
have commercial uses relating to their properties as surface active
agents. The alcohols themselves are not surface active. Whilst the
preliminary assessment by Hydrophilic Lipophilic Balance (HLB) suggests
that the shortest chain members of the Category (C6 - C8) could be
water/oil emulsifiers, this should not be over-interpreted. They are
co-surfactants used to modify the properties of other surfactants.
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