Abstract：This paper presents the results of a laboratory investigation performed to study the solubilization of naphthalene by nonionic surfactant of Tween80. A series of batch experiments were conducted to investigate the effect of temperature, ionic strength, and coexisting contaminants (e g. benzene and nitrobenzene) on the solubilization efficiency. The results demonstrated that naphthalene solubility in water was greatly improved in the presence of Tween80, the apparent solubility of naphthalene reached 489.70mg/L in Tween80 solution of 10.0g/L; there was a linear positive correlation between the naphthalene apparent solubility and the factor of temperature or ionic strength, and the effect of temperature on solubilization was more obvious; the coexisting contaminants negatively influenced the naphthalene apparent solubility, and the effect was greater in the presence of benzene.
