Availability of metals to DGT devices with different configurations. The case of sequential Ni complexation

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dc.contributor.authorSans Duñó, Jordi
dc.contributor.authorCecilia, Joan
dc.contributor.authorGalceran i Nogués, Josep
dc.contributor.authorPuy Llorens, Jaume
dc.date.accessioned2021-12-28T10:27:44Z
dc.date.available2021-12-28T10:27:44Z
dc.date.issued2021-07
dc.description.abstractThe analytical technique DGT (Diffusive Gradients in Thin-films) is able to gain access to a wealth of information by carefully interpreting accumulation data from passive samplers with different configurations (i.e. different thicknesses of its constituent layers). A set of DGT devices were simultaneously deployed in solutions of Ni and nitrilotriacetic acid (NTA) of different concentrations to measure the availability of Ni in these solutions. Accumulations indicate that the availability of Ni depends on both the thickness of the resin and the thickness of the diffusive gel. In both cases, the lability degree increases as the thickness increases. As the formation of successive complexes (such as Ni(NTA)2) proceeds, the availability of the metal decreases, which is quantitatively explained by reducing the formulation to a case with only one complex, but with an effective dissociation rate constant that decreases as the concentration of NTA increases. Simple analytical expressions are reported to quantify the lability degree in the different DGT configurations. These results indicate that a set of different DGT devices can characterize the availability of a cation in a natural sample with uptake processes at different spatial or time scales. Alternatively, and from a more fundamental point of view, information on speciation, mobilities and labilities of the species present in natural samples can be obtained with a set of DGT configurations.ca_ES
dc.description.sponsorshipSupport from the Spanish Minister of Science and Innovation isgratefully acknowledged (Project PID2019-107033GB-C21). JSD ac-knowledges the University of Lleida for a fellowship PhD contract.ca_ES
dc.identifier.doihttps://doi.org/10.1016/j.scitotenv.2021.146277
dc.identifier.idgrec031739
dc.identifier.issn0048-9697
dc.identifier.urihttp://hdl.handle.net/10459.1/72657
dc.language.isoengca_ES
dc.publisherElsevierca_ES
dc.relationinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-107033GB-C21/ES/CAPTADORES PASIVOS (DGT, DMT) Y TECNICAS ELECTROANALITICAS PARA ESPECIACION Y DISPONIBILIDAD EN AGUAS NATURALES Y SUELOS: MODELIZACION, DESARROLLO, APLICACION E INTERPRETACION/ca_ES
dc.relation.isformatofReproducció del document publicat a https://doi.org/10.1016/j.scitotenv.2021.146277ca_ES
dc.relation.ispartofScience of The Total Environment, 2021, vol. 779, núm. 146277, p. 1-12ca_ES
dc.rightscc-by (c) Sans et al., 2021ca_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessca_ES
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectDGTca_ES
dc.subjectLability degreeca_ES
dc.subjectStoichiometry effectsca_ES
dc.subjectThickness of diffusionca_ES
dc.subjectThickness of resinca_ES
dc.subjectNiNTAca_ES
dc.titleAvailability of metals to DGT devices with different configurations. The case of sequential Ni complexationca_ES
dc.typeinfo:eu-repo/semantics/articleca_ES
dc.type.versioninfo:eu-repo/semantics/publishedVersionca_ES
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