Sorption of ortho-Phenylphenol to Soils

Abstract

Conflicting sorption coefficients for ortho-phenylphenol (OPP) have been reported in the literatures, which resulted in the conflicting assessments on OPP mobility in soil. To ascertain the sorption coefficient of OPP, batch experiments were performed based on OECD guideline 106, using three types of soils. Headspace solid-phase microextraction (HS-SPME) and GC-MS were applied to the determination of OPP concentration in the liquid phase. The sorption isotherms obtained for all three soils under equilibrium conditions were described well, assuming linear sorption. The organic carbon normalized distribution coefficients (K-oc) ranged from 894 to 1703 L kg(-1), which suggested that OPP is moderately mobile in soil. The results also showed that the K-oc value of OPP can be predicted precisely from K-ow, whereas it was underestimated by one order of magnitude when water solubility is used.