Pentachlorophenol sorption by variable-charge soils in methanol-water mixture: pH effect at the low solvent volume fraction

Chemosphere
Seunghun Hyun, L S Lee

Abstract

Information on how cosolvents affect sorption of ionizable chemicals by soils with heterogeneous variable-charge mineral surface domains is sparse. In this study, the effect of soil-solution pH in methanol/water solutions on sorption of pentachlorophenol (PCP) by variable-charge soils with a range of hydrophilic (f Hphilic) and hydrophobic (f Hphobic) sorption domains was characterized. PCP sorption by 10 variable-charge soils was measured as a function of apparent pH (pH app) and methanol volume fraction (fc<or=0.6). Sorption data of both neutral (pH app<3) and anionic PCP (pH app>8) decreased log-linearly with increasing fc, but the slope of the relationship was less for anionic PCP. The empirical solvent-sorbent interaction term for anionic PCP (alpha i) was inversely correlated with f Hphilic (r2=0.82), which is consistent with methanol-induced increases in anion exchange. For neutral PCP, the empirical term (alpha n) was positively correlated with f Hphobic (r2=0.84), supporting methanol-induced increases in solution and sorbent hydrophobicity. Sorption of PCP by two soils with varying f Hphilic in the pH app range from 3 to 8 at fc<or=0.5 was well predicted using a cosolvency model. The model included only pH app-pK'a dep...Continue Reading

References

Jul 10, 2002·Journal of Contaminant Hydrology·Dermont C Bouchard
Jun 1, 1994·Environmental Science & Technology·C T Chiou, D E Kile

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Citations

Oct 26, 2011·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Juhee KimYong Sik Ok
Jan 24, 2012·Journal of Hazardous Materials·Hongbo PengBaoshan Xing
Jun 2, 2015·Environmental Science and Pollution Research International·Minhee KimSeunghun Hyun

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