Aqueous chemistry and interactive effects on non-ionic surfactant and pentachlorophenol sorption to soil.
Non-ionic surfactant addition was investigated as a method to remediate pentachlorophenol (PCP) contaminated soil. The goal was to quantify surfactant (Tergitol NP-10 (TNP10)) and PCP sorption to soil and their interactive effects under varying pH, ionic strength, and soil conditions. Up to 16,700 mg/kg of TNP10 partitioned to soil, with increasing sorption far above the critical micelle concentration (CMC) and with greater amounts of PCP present. Approximately 40-45 times more TNP10 and 20-30 times more PCP sorbed to the finer soil with higher organic matter content. Aqueous TNP10 concentrations well above the CMC (>/=5500 mg/L) were required to enhance PCP desorption from the soil. As pH increased by 0.5-0.85 units, TNP10 sorption decreased by 14-25% and PCP sorption as measured by the log of the equilibrium partition coefficient decreased by 1-1.5. A lower ionic strength of 0.03 versus 0.112 M increased PCP desorption from contaminated soil by 5-17% in the presence of TNP10. This work is relevant to designing ex situ soil washing or surfactant-aided PCP remediation.
Park
Sung-Kil
SK
POSCO, Environment and Energy Department, 1 Goedong-dong, Nam-gu, Pohang, Gyeongbuk 790-785, P.O. Box 36, Pohang, South Korea.
Bielefeldt
Angela R
AR
D000327:Adsorption; D004787:Environmental Pollution / Q000517:prevention & control; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000737:chemistry*; D010416:Pentachlorophenol / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D013501:Surface-Active Agents / Q000737:chemistry*
D007306:Insecticides; D012989:Soil Pollutants; D013501:Surface-Active Agents; D010416:Pentachlorophenol