The results of the solubility of water in basic gasoline
containing surfactants show that the effect of Primene
81-R more hydrophilic and Primene JM-T more hydrophobic
is negligible and does not depend significantly upon
amine concentration. Under the studied conditions amines
are not protonated and they can be considered as neutral
substances. In the presence of DBS-Ca and AOT, water
content in the basic gasoline can be even 3–5 times higher,
compared with the gasoline. However, DBS-Ca and AOT
are typical anionic surfactants and they may form reversed
micelles. The phenomenon is reflected in a rapid increase of
water solubility for surfactant concentrations above
5 · 103 M. An atypical shape of water solubility is
obtained for AOT, which may be due to some structural
changes.