Trace elements fractionation in anaerobic digestates: Recommendation for using diffusive gradients in thin films passive samplers

This study proposes an evaluation of the Diffusive Gradients in Thin films (DGT) technique to assess the labile fraction of trace metals and metalloids in anaerobic digestates. Experiments were performed in presence and absence of air to determine whether maintaining anaerobic conditions is mandator...

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Bibliographic Details
Published inJournal of environmental management Vol. 360; p. 121223
Main Authors Caroca Sepúlveda, Eric, Buzier, Rémy, Simon, Stéphane, Fermoso, Fernando, Zahedi, Soraya, Guibaud, Gilles
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 01.06.2024
Elsevier
Subjects
Anaerobic digestion
Anaerobiosis
Bioavailability
Environmental Sciences
Fractionation
Metals
Passive sampling
Trace Elements - analysis
Fractionation
Bioavailability
Passive sampling
Metals
Anaerobic digestion
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Summary:This study proposes an evaluation of the Diffusive Gradients in Thin films (DGT) technique to assess the labile fraction of trace metals and metalloids in anaerobic digestates. Experiments were performed in presence and absence of air to determine whether maintaining anaerobic conditions is mandatory during DGT deployments. A theoretically expected linear accumulation profile was observed for Fe, Mn, Ni, Mo, and As(III) in a manure-derived digestate and for Mn in distillery waste-derived digestate, whereas Al and Cu were detected without a consistent trend over time. The DGT technique can thus be used to evaluate the labile fraction of some trace elements in these digestates. The labile fraction of some elements was shown to evolve over 72 h when deployments were performed in the presence of air. We thus strongly recommend to systematically perform time-series deployments to identify and consider only the elements with a linear accumulation trend and to maintain anaerobic conditions. [Display omitted] •Several labile trace elements were satisfactorily sampled by DGT in digestates.•DGT allows bioaccessible trace elements estimation in raw anaerobic digestates.•Air exposure and high P content is demonstrated to restrict the application of DGT.•Specific DGT deployment strategies were developed to detect sampling issues.
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ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2024.121223