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Estimating the Acid–Base Properties and Electrical Charge of Organic Matter Using Spectrophotometry

hal.structure.identifierGéosciences Rennes [GR]
dc.contributor.authorTESFA, Marawit
hal.structure.identifierGéosciences Rennes [GR]
dc.contributor.authorDIA, Aline
hal.structure.identifierInstitut de Recherche Mathématique de Rennes [IRMAR]
dc.contributor.authorMAHÉ, Fabrice
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorJANOT, Noémie
hal.structure.identifierGéosciences Rennes [GR]
dc.contributor.authorMARSAC, Rémi
dc.date.accessioned2024-04-08T11:42:55Z
dc.date.available2024-04-08T11:42:55Z
dc.date.issued2023-08-15
dc.identifier.issn0013-936X
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195087
dc.description.abstractEnSpectrophotometric acid–base titration is a simple and powerful technique to evaluate the properties of proton binding sites of natural organic matter (NOM) at environmentally relevant concentrations. However, it is challenging to quantify the chemical charges (Q) carried by NOM at these concentrations. Based on a previous work, which relates the variation of Q with the specific UV–vis differential absorbance (ΔAλ,pH) at a given wavelength (λ) and pH of a dissolved NOM sample, the present work proposes a method to investigate any NOM sample. It determines specific features in the absorbance spectra attributed to proton-inert chromophores (A0,λ) and to the deprotonation processes of carboxylic (A1,λ) and phenolic groups (A2,λ). It enables to select sample-specific wavelength (λmid), where both these functional groups significantly contribute to the variation of absorbance with pH. The linear regression analysis of Aλmid,pH vs Q for various NOM reference samples evidenced that the sample-specific slope (SNOM) and intercept (INOM) were related to the intrinsic spectroscopic properties of the sample (A0,λmid, A1,λmid, and A2,λmid). This approach can thus be used to approximate the Q values of the NOM samples at environmentally relevant concentrations: a pre-requisite for predicting the fate and behavior of metal ions in natural systems.
dc.description.sponsorshipLe devenir des contaminants est contrôlé par la spéciation de la matière organique colloïdale - ANR-18-CE01-0008
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.subject.ennatural organic matter
dc.subject.enacid−base functional groups
dc.subject.enproton titration
dc.subject.enabsorbance spectra
dc.title.enEstimating the Acid–Base Properties and Electrical Charge of Organic Matter Using Spectrophotometry
dc.typeArticle de revue
dc.typeArticle de synthèse
dc.identifier.doi10.1021/acs.est.3c04965
dc.subject.halChimie
dc.description.sponsorshipEuropeFEDER
bordeaux.journalEnvironmental Science and Technology
bordeaux.page12053-12062
bordeaux.volume57
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue32
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierinsu-04182319
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//insu-04182319v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Environmental%20Science%20and%20Technology&rft.date=2023-08-15&rft.volume=57&rft.issue=32&rft.spage=12053-12062&rft.epage=12053-12062&rft.eissn=0013-936X&rft.issn=0013-936X&rft.au=TESFA,%20Marawit&DIA,%20Aline&MAH%C3%89,%20Fabrice&JANOT,%20No%C3%A9mie&MARSAC,%20R%C3%A9mi&rft.genre=article&unknown


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