A new approach to improve the accuracy of DGT (Diffusive Gradients in Thin-films) measurements in monitoring wells

Página do item simplificado
dc.contributor.authorSantos, Cristiane Aily [UNESP]
dc.contributor.authorGemeiner, Hendryk [UNESP]
dc.contributor.authorMenegário, Amauri Antonio [UNESP]
dc.contributor.authorGalceran, Josep
dc.contributor.authorZanatta, Melina Borges Teixeira [UNESP]
dc.contributor.authorChang, Hung Kiang [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-05-01T10:18:57Z
dc.date.available2022-05-01T10:18:57Z
dc.date.issued2022-02-01
dc.description.abstractThe Diffusive Gradients in Thin-films (DGT) technique represents an ideal tool for monitoring water quality of inorganic species in systems with a high flow such as rivers, streams, lakes and seas. However, in low-flow systems (non-turbulent waters), the influence of a diffusive boundary layer (DBL) formed on the surface of the DGT device has been observed, which can lead to erroneous measurements by DGT. Therefore, the use of DGT in wells for groundwater monitoring is still very limited until now. In this sense, the present study evaluates the applicability of the DGT technique in non-turbulent and low-flow water systems. We propose a new way to calculate the DBL with the objective to carry out a robust DGT analysis in environmental monitoring wells. For this purpose, DGT devices with different diffusive gel thicknesses were deployed in an experimental set-up simulating a groundwater monitoring well. A DBL thickness (for each element) was calculated from the slopes of the linear regressions between the DGT accumulated mass of metal and the deployment time (4, 8, 12, 24 and 48 h) for each of the two diffusive gel thicknesses. The mean DBL thickness (averaging the individual DBL thicknesses calculated from the slopes) was 0.06 cm. The concentrations of the analysed elements were corrected with this DBL with the result that the metal concentrations measured by DGT improved and were highly approximated to their actual total values in this non-complexing medium.en
dc.description.affiliationEnvironmental Studies Center (CEA) São Paulo State University (UNESP), Avenida 24-A, 1515
dc.description.affiliationDepartment of Applied Geology and Basin Studies Laboratory (LEBAC) São Paulo State University (UNESP), Avenida 24-A, 1515
dc.description.affiliationDepartment of Chemistry –Universitat de Lleida and AGROTECNIO-CERCA, Av Rovira Roure 191, Catalunya
dc.description.affiliationUnespEnvironmental Studies Center (CEA) São Paulo State University (UNESP), Avenida 24-A, 1515
dc.description.affiliationUnespDepartment of Applied Geology and Basin Studies Laboratory (LEBAC) São Paulo State University (UNESP), Avenida 24-A, 1515
dc.description.sponsorshipMinisterio de Ciencia, Innovación y Universidades
dc.description.sponsorshipAgencia Estatal de Investigación
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipFundação para o Desenvolvimento da UNESP (FUNDUNESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdAgencia Estatal de Investigación: 10.13039/501100011033
dc.description.sponsorshipIdFAPESP: 2016/14227-5
dc.description.sponsorshipIdFAPESP: 2018/17069-3
dc.description.sponsorshipIdFAPESP: 2018/17069-7
dc.description.sponsorshipIdFAPESP: 2021/00572-0
dc.description.sponsorshipIdFUNDUNESP: 2625/2017-CCP
dc.description.sponsorshipIdCNPq: 308090/2019-5
dc.description.sponsorshipIdCNPq: 403666/2016-3
dc.description.sponsorshipIdFUNDUNESP: 5850.0106842.18.9
dc.description.sponsorshipIdAgencia Estatal de Investigación: PID2019-107033GB
dc.identifierhttp://dx.doi.org/10.1016/j.talanta.2021.123044
dc.identifier.citationTalanta, v. 238.
dc.identifier.doi10.1016/j.talanta.2021.123044
dc.identifier.issn0039-9140
dc.identifier.scopus2-s2.0-85118862081
dc.identifier.urihttp://hdl.handle.net/11449/233788
dc.language.isoeng
dc.relation.ispartofTalanta
dc.sourceScopus
dc.subjectDBL
dc.subjectDiffusive gradients in thin-films
dc.subjectGroundwater monitoring
dc.subjectStagnant waters
dc.subjectWell
dc.titleA new approach to improve the accuracy of DGT (Diffusive Gradients in Thin-films) measurements in monitoring wellsen
dc.typeArtigo
unesp.author.orcid0000-0002-1111-9758 0000-0002-1111-9758[3]
unesp.author.orcid0000-0002-7132-1851[5]

Arquivos

Coleções

Rio Claro - CEA - Centro de Estudos Ambientais
Artigos - Geologia Aplicada - IGCE