Abstract
The adsorption of three tricresyl phosphate (TCP) isomers, o-, m-, and p-TCP, onto kaolin, alumina, and montmorillonite without coating or coated with linear-dodecylbenzenesulfonate (DBS) or humic acid was studied. The amount of TCP isomers adsorbed per unit mass of mineral followed the order alumina < kaolin < montmorillonite, but that per unit surface area of mineral was in the order kaolin < montmorillonite < alumina. The amount of TCP adsorbed was almost constant between pH 4 and 9. Higher adsorption per unit surface area on alumina might be due to the strong interaction between Al and phosphate oxygen (P0) of TCP. Adsorption of TCP isomers on kaolin and alumina followed the order o-TCP < m-TCP < p-TCP, depending on their steric hindrance. Adsorption of TCP isomers on kaolin and alumina was enhanced with an increase in DBS adsorbed. This might be due to the hydrophobic interaction of TCP isomers with DBS adsorbed on minerals. Similarly, the adsorption of TCP isomers was accelerated in the presence of humic acid. However, adsorptive capacity of TCP isomers on minerals coated with humic acid was smaller than that with DBS. This is possibly due to the difference in hydrophobicity between humic acid and DBS adsorbed. It was confirmed that the carbon-normalized adsorption coefficient (Koca) decreased with increasing carbon mass fraction of DBS and humic acid adsorbed on minerals.
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