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dc.contributor.authorLi, Hui
dc.contributor.authorLee, Linda
dc.contributor.authorFábrega, José
dc.contributor.authorJafvert, Chad
dc.date.accessioned2018-03-23T15:24:59Z
dc.date.accessioned2018-03-23T15:24:59Z
dc.date.available2018-03-23T15:24:59Z
dc.date.available2018-03-23T15:24:59Z
dc.date.issued08/04/2001
dc.date.issued08/04/2001
dc.identifierhttps://www.sciencedirect.com/science/article/pii/S0045653500005117
dc.identifier.urihttp://ridda2.utp.ac.pa/handle/123456789/4448
dc.identifier.urihttp://ridda2.utp.ac.pa/handle/123456789/4448
dc.descriptionPredicting the reversible interactions between aromatic amines and soil is essential for assessing the mobility, bioavailability and exposure from contaminated sites. Reversible sorption mechanisms of aniline and α-naphthylamine were investigated by using single and binary solute sorption to five soils at several pH values, and by applying a distributed parameter (DP) model. The DP model assumes linear partitioning of the neutral species into soil organic matter domains and organic cation binding on negative-charged sites with the exchange coefficients represented by a Gaussian probability distribution. Sorption nonlinearity was attributed to cation exchange with varying site affinities, which was adequately simulated using the DP model. Greater uptake by hydrophobic partitioning and selectivity for cation exchange sites was observed for α-naphthylamine compared to aniline. Sorption of α-naphthylamine was not impacted quantitatively by aniline under those conditions examined; however, aniline sorption was reduced by α-naphthylamine with the largest reduction occurring in the soil with the lowest pH. DP model simulations showed that although hydrophobic partitioning increases with soil–solution pH, cation exchange still contributes significantly to the total sorption even at soil–solution pH values greater than pKa+2.en_US
dc.description.abstractPredicting the reversible interactions between aromatic amines and soil is essential for assessing the mobility, bioavailability and exposure from contaminated sites. Reversible sorption mechanisms of aniline and α-naphthylamine were investigated by using single and binary solute sorption to five soils at several pH values, and by applying a distributed parameter (DP) model. The DP model assumes linear partitioning of the neutral species into soil organic matter domains and organic cation binding on negative-charged sites with the exchange coefficients represented by a Gaussian probability distribution. Sorption nonlinearity was attributed to cation exchange with varying site affinities, which was adequately simulated using the DP model. Greater uptake by hydrophobic partitioning and selectivity for cation exchange sites was observed for α-naphthylamine compared to aniline. Sorption of α-naphthylamine was not impacted quantitatively by aniline under those conditions examined; however, aniline sorption was reduced by α-naphthylamine with the largest reduction occurring in the soil with the lowest pH. DP model simulations showed that although hydrophobic partitioning increases with soil–solution pH, cation exchange still contributes significantly to the total sorption even at soil–solution pH values greater than pKa+2.en_US
dc.formatapplication/pdf
dc.formattext/html
dc.languageeng
dc.rightsinfo:eu-repo/semantics/embargoedAccess
dc.subjectCompetitive sorptionen_US
dc.subjectSpeciationen_US
dc.subjectAromatic amineen_US
dc.subjectDistributed parameter modelen_US
dc.subjectCation exchangeen_US
dc.subjectPartitioningen_US
dc.subjectCompetitive sorption
dc.subjectSpeciation
dc.subjectAromatic amine
dc.subjectDistributed parameter model
dc.subjectCation exchange
dc.subjectPartitioning
dc.titleRole of pH in partitioning and cation exchange of aromatic amines on water-saturated soilsen_US
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion


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