Coadsorption at the air/water interface likely explains some pollutants transfer to the atmosphere: benzene and lead case

Adsorption and Wetting Mechanisms at the Surface of Aqueous Hydrocarbon Solutions as a Possible Source of Atmospheric Pollution

“…For benzene, the solubility determined at 25°C was 2.37 × 10 -2 mol L -1 [5]; this value agrees with literature data [26][27]. According to [28], the one for cyclohexane is 6.55 ± 0.27 × 10 -4 mol L -1 ; this value is very close to our own estimation.…”

“…Under our experimental conditions, all the verifications we made demonstrated the lack of complexation for Pb ++ ions [5][6]. Table 1 lists the interfacial tensions measured by tensiometry at 25 and 30°C in saturated diphasic mixtures of waterbenzene as well as in water-cyclohexane; α means vapour, β denotes aqueous phase, γ refers to oily phase and is the angle defined above.…”

“…In previous studies [5][6], we showed that, once adsorbed at the air/water interface, benzene and cyclohexane can induce the coadsorption of a heavy metal salt, namely lead nitrate. We selected this salt because of its solubility properties; in addition, it constitutes an excellent model for ions of concern in environmental problems [7].…”

“…For each species present in the bubble column, the measurement of C(z) at steady state along the column versus the altitude z gives J from Equation (8). With this value of J, additional measurements of A, a, f and D lead to K by solving equation (7), and finally to Γ by using Equation (5). Usually, D can be determined from the expression of the timedependent concentration profile and measurement of such profiles by different methods [13,22].…”

“…To get true molecular solutions of hydrocarbons, we first prepared saturated solutions by gently stirring with water just a little more than the necessary quantity of benzene [5] or cyclohexane. For benzene, the solubility determined at 25°C was 2.37 × 10 -2 mol L -1 [5]; this value agrees with literature data [26][27].…”