Organic compound distribution between nonionic surfactant solution and natural solids: Applicability of a solution property parameter

Selective adsorption and partitioning of nonionic surfactants onto solids via liquid chromatograph mass spectra analysis

“…The adsorption capacity of surfactants on the two solids has a decreasing order: TX-405 > TX-305 > TX-100, namely, the adsorption capacity of surfactants is proportional to their average EO number. This result is similar to other reports in the literature [4,14,18,20]. On the other hand, although several studies have reported that surfactants may aggregate on the solid surface to form a admi- celle [11,21], the isotherms shown in Fig.…”

“…The surfactant properties including ethylene oxide (EO) number and critical micelle concentration (CMC) value as well as the solid's surface area, mineral phase composition, and organic matter (OM) contents are key factors in the determination of the uptake capacity [13][14][15][16][17]. Generally, on the basis of adsorptive mass, surfactants with a higher EO number would have a relatively higher adsorption to a given solid [18] as well as solids with a higher surface area may possess higher uptake capacity for a given surfactant. However, most of the commercially available nonionic surfactants consist of a mixture of different components and the adsorptive competition resulting from the difference in the affinity of the individual component of surfactants to the solid leads to the possibility of an estimation error for the overall surfactant adsorption.…”

Surfactant–soil interactions during surfactant-amended remediation of contaminated soils by hydrophobic organic compounds: A review

“…Above CMC, surfactant micelles in the aqueous phase compete with soil-sorbed surfactant as an effective partitioning medium for HOCs resulting in decreasing K d * values (Sun et al, 1995). Lee et al (2006) report on the applicability of a solution property parameter (f) defined as the ratio of the estimated to the measured K d * values, to describe the distribution of organic compounds between nonionic surfactant solutions and natural solids. Greater f values represent higher release of HOCs from soil to water; for relatively high solubility compounds f values are close to 1; for lower solubility compounds f values are much greater than 1 and increase with increasing compound affinity to surfactants (Lee et al, 2006).…”

“…Lee et al (2006) report on the applicability of a solution property parameter (f) defined as the ratio of the estimated to the measured K d * values, to describe the distribution of organic compounds between nonionic surfactant solutions and natural solids. Greater f values represent higher release of HOCs from soil to water; for relatively high solubility compounds f values are close to 1; for lower solubility compounds f values are much greater than 1 and increase with increasing compound affinity to surfactants (Lee et al, 2006). Rodriguez-Cruz et al (2005) examined the adsorption of surfactants on soils based on physicochemical and mineralogical properties of soils.…”

Enhanced soil retention for o-nitroaniline by the addition of a mixture of a cationic surfactant (Cetyl Pyridinium Chloride) and a nonionic surfactant (Polyethylene Glycol Mono-4-nonylphenyl Ether)

“…It was suggested that such modified soils and clays may be used as clay landfill liners and slurry walls to improve the contaminant retardation and to avoid their dispersion [6]. Nonionic surfactants can also adsorb on soils and clays with a large quantity and act as the effective organic medium for sorption [18][19][20][21][22][23]. For example, Backhaus et al [18] and Lee et al [19,20] observed that the modification with nonionic surfactants can enhance sorption of organic contaminants on montmorillonite.…”