The Role of Concentration and Solvent Character in the Molecular Organization of Humic Acids

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dc.contributor.authorKlučáková, Martinacs
dc.contributor.authorVěžníková, Kateřinacs
dc.coverage.issue1cs
dc.coverage.volume21cs
dc.date.issued2016-10-21cs
dc.description.abstractThe molecular organization of humic acids in different aqueous solutions was studied over a wide concentration range (0.01–10 g/dm3). Solutions of humic acids were prepared in three different media: NaOH, NaCl, and NaOH neutralized by HCl after dissolution of the humic sample. Potentiometry, conductometry, densitometry, and high resolution ultrasound spectrometry were used in order to investigate conformational changes in the humic systems. The molecular organization of humic acids in the studied systems could be divided into three concentration ranges. The rearrangements were observed at concentrations of ~0.02 g/dm3 and ~1 g/dm3. The first “switch-over point” was connected with changes in the hydration shells of humic particles resulting in changes in their elasticity. The compressibility of water in the hydration shells is less than the compressibility of bulk water. The transfer of hydration water into bulk water increased the total compressibility of the solution, reducing the ultrasonic velocity. The aggregation of humic particles and the formation of rigid structures in systems with concentrations higher than 1 g/dm3 was detected.en
dc.description.abstractBylo studováno chování huminových kyselin ve třech různých prostředích lišících se chemickým složením a způsobem přípravy. Byly zjištěny dva důležité zlomy v chování těchto systémů, první při nízkých koncentracích kolem 0,02 g/dm3, kdy dochází ke změnám v hydratačním obalu a druhý kolem koncentrace 1 g/dm3, který je spojen s počátkem agregace huminových částic.cs
dc.formattextcs
dc.format.extent1410-1418cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationMOLECULES. 2016, vol. 21, issue 1, p. 1410-1418.en
dc.identifier.doi10.3390/molecules21101410cs
dc.identifier.issn1420-3049cs
dc.identifier.orcid0000-0003-4969-6988cs
dc.identifier.other129206cs
dc.identifier.urihttp://hdl.handle.net/11012/68390
dc.language.isoencs
dc.publisherMDPI AGcs
dc.relation.ispartofMOLECULEScs
dc.relation.urihttp://www.mdpi.com/1420-3049/21/11/1410cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1420-3049/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjecthumic aciden
dc.subjectmolecular organizationen
dc.subjectconformationen
dc.subjectaggregationen
dc.subjectultrasound spectrometryen
dc.subjecthuminové kyseliny
dc.subjectmolekulární organizace
dc.subjectkonformace
dc.subjectagregace
dc.subjectultrazvukové spektroskopie
dc.titleThe Role of Concentration and Solvent Character in the Molecular Organization of Humic Acidsen
dc.title.alternativeRole koncentrace a charakteru rozpouštědla v molekulární organizace huminových kyselincs
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-129206en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:37:47en
sync.item.modts2025.01.17 16:48:00en
thesis.grantorVysoké učení technické v Brně. Fakulta chemická. CMV - laboratoř biokoloidůcs
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