Hodges, Geoff published the artcileA comparison of log Kow (n-octanol-water partition coefficient) values for non-ionic, anionic, cationic and amphoteric surfactants determined using predictions and experimental methods, COA of Formula: C8H18O, the main research area is partition coefficient surfactant prediction.
Surfactants are widely used across the globe both in industrial and consumer products. The n-octanol/water partition ratio or coefficient (log Kow) and n-octanol/water distribution coefficient (log D) are key parameters in environmental risk assessment of chems. as they are often used to estimate the environmental fate and bioavailability and thus exposure and toxicity of a compound Determining log Kow data for surfactants is a tech. challenge due to their amphiphilic properties. Currently several existing exptl. OECD methods (e.g. slow-stirring, HPLC, solubility ratio) and QSPR models are available for log Kow/D measurement or prediction. However, there are concerns that these methods have not been fully validated for surfactants and may not be applicable due to the specific phase behavior of surfactants. Results: The current methods were evaluated for the four surfactant classes (non-ionic, anionic, cationic and amphoteric). The solubility ratio approach, based on comparative n-octanol and water solubility measurements, did not generate robust or accurate data. The HPLC method generates consistently higher log Kow values than the slow-stirring method for non-ionics, but this pos. bias could be removed using reference surfactants with log Kow values determined using the slow-stirring method. The slow-stirring method is the most widely applicable exptl. method for generating log Kow/D data for all the surface-active test compounds Generally, QSPR-predicted log Kow/D values do not correlate well with exptl. values, apart for the group of non-ionic surfactants. Relatively, large differences in predicted log Kow/D values were observed when comparing various QSPR models, which were most noticeable for the ionised surfactants. Conclusions: The slow-stirring method is the most widely applicable exptl. method for generating log Kow/D data for all the four surfactant classes. A weight of evidence approach is considered appropriate for non-ionic surfactants using exptl. and model predications. However, it is more difficult to apply this approach to ionisable surfactants. Recommendations are made for the preferred existing QSPR predictive methods for determination of log Kow/D values for the surfactant classes. Investigation of newer alternative exptl. log Kow methods as well as more biol. relevant and methodol. defensible alternative methods for describing partitioning of surfactants are recommended.
Environmental Sciences Europe published new progress about Partition. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, COA of Formula: C8H18O.
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts