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dc.contributor.authorArthur, Jennifer D.
dc.contributor.authorMark, Noah W.
dc.contributor.authorTaylor, Susan
dc.contributor.authorŠimunek, J.
dc.contributor.authorBrusseau, M.L.
dc.contributor.authorDontsova, Katerina M.
dc.date.accessioned2017-06-12T21:39:31Z
dc.date.available2017-06-12T21:39:31Z
dc.date.issued2017-04
dc.identifier.citationBatch soil adsorption and column transport studies of 2,4-dinitroanisole (DNAN) in soils 2017, 199:14 Journal of Contaminant Hydrologyen
dc.identifier.issn01697722
dc.identifier.doi10.1016/j.jconhyd.2017.02.004
dc.identifier.urihttp://hdl.handle.net/10150/624067
dc.description.abstractThe explosive 2,4,6-trinitrotoluene (TNT) is currently a main ingredient in munitions; however the compound has failed to meet the new sensitivity requirements. The replacement compound being tested is 2,4-dinitroanisole (DNAN). DNAN is less sensitive to shock, high temperatures, and has good detonation characteristics. However, DNAN is more soluble than TNT, which can influence transport and fate behavior and thus bio-availability and human exposure potential. The objective of this study was to investigate the environmental fate and transport of DNAN in soil, with specific focus on sorption processes. Batch and column experiments were conducted using soils collected from military installations located across the United States. The soils were characterized for pH, electrical conductivity, specific surface area, cation exchange capacity, and organic carbon content. In the batch rate studies, change in DNAN concentration with time was evaluated using the first order equation, while adsorption isotherms were fitted using linear and Freundlich equations. Solution mass-loss rate coefficients ranged between 0.0002 h(-1) and 0.0068 h(-1). DNAN was strongly adsorbed by soils with linear adsorption coefficients ranging between 0.6 and 6.3 L g(-1), and Freundlich coefficients between 1.3 and 34 mg(1-n) L-n kg(-1). Both linear and Freundlich adsorption coefficients were positively correlated with the amount of organic carbon and cation exchange capacity of the soil, indicating that similar to TNT, organic matter and clay minerals may influence adsorption of DNAN. The results of the miscible-displacement column experiments confirmed the impact of sorption on retardation of DNAN during transport. It was also shown that under flow conditions DNAN transforms readily with formation of amino transformation products, 2-ANAN and 4-ANAN. The magnitudes of retardation and transformation observed in this study result in significant attenuation potential for DNAN, which would be anticipated to contribute to a reduced risk for contamination of ground water from soil residues.
dc.description.sponsorshipStrategic Environmental Research and Development Program, SERDP [ER-2220]en
dc.language.isoenen
dc.publisherELSEVIER SCIENCE BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0169772216301310en
dc.rights© 2017 Elsevier B.V. All rights reserved.en
dc.subject2,4-Dinitroanisole (DNAN)en
dc.subject2-Amino-4-nitroanisole (2-ANAN)en
dc.subject4-Amino-2-nitroanisole (4-ANAN)en
dc.subjectSoil adsorptionen
dc.subjectOrganic carbon (OC)en
dc.subjectCation exchange capacity (CEC)en
dc.titleBatch soil adsorption and column transport studies of 2,4-dinitroanisole (DNAN) in soilsen
dc.typeArticleen
dc.contributor.departmentSoil, Water and Environmental Science Department, University of Arizonaen
dc.contributor.departmentHydrology and Atmospheric Sciences Department, University of Arizonaen
dc.contributor.departmentBiosphere 2, University of Arizonaen
dc.identifier.journalJournal of Contaminant Hydrologyen
dc.description.note24 month embargo; Available online 1 March 2017en
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal accepted manuscripten
html.description.abstractThe explosive 2,4,6-trinitrotoluene (TNT) is currently a main ingredient in munitions; however the compound has failed to meet the new sensitivity requirements. The replacement compound being tested is 2,4-dinitroanisole (DNAN). DNAN is less sensitive to shock, high temperatures, and has good detonation characteristics. However, DNAN is more soluble than TNT, which can influence transport and fate behavior and thus bio-availability and human exposure potential. The objective of this study was to investigate the environmental fate and transport of DNAN in soil, with specific focus on sorption processes. Batch and column experiments were conducted using soils collected from military installations located across the United States. The soils were characterized for pH, electrical conductivity, specific surface area, cation exchange capacity, and organic carbon content. In the batch rate studies, change in DNAN concentration with time was evaluated using the first order equation, while adsorption isotherms were fitted using linear and Freundlich equations. Solution mass-loss rate coefficients ranged between 0.0002 h(-1) and 0.0068 h(-1). DNAN was strongly adsorbed by soils with linear adsorption coefficients ranging between 0.6 and 6.3 L g(-1), and Freundlich coefficients between 1.3 and 34 mg(1-n) L-n kg(-1). Both linear and Freundlich adsorption coefficients were positively correlated with the amount of organic carbon and cation exchange capacity of the soil, indicating that similar to TNT, organic matter and clay minerals may influence adsorption of DNAN. The results of the miscible-displacement column experiments confirmed the impact of sorption on retardation of DNAN during transport. It was also shown that under flow conditions DNAN transforms readily with formation of amino transformation products, 2-ANAN and 4-ANAN. The magnitudes of retardation and transformation observed in this study result in significant attenuation potential for DNAN, which would be anticipated to contribute to a reduced risk for contamination of ground water from soil residues.


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