Revisited: DGT speciation analysis of metal–humic acid complexes

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3 Citations (Scopus)

Abstract

Soil humic acids and their metal complexes are sorbed by hydrogel phases such as those used in DGT analysis. The accumulation is spatially inhomogeneous: a thin film near the interface with the aqueous medium typically hosts ~10 times the concentration in the medium, whereas the bulk gel features an accumulation factor of ~2. Here we discuss the consequences of these sorption properties for the usual type of DGT experiment. It appears that the eventual steady-state metal flux is not affected, but the characteristic time of establishing truly steady-state diffusion conditions may be even longer than the common DGT deployment time of a few days.
Original languageEnglish
Pages (from-to)84-88
JournalEnvironmental Chemistry
Volume13
Issue number1
DOIs
Publication statusPublished - 2016

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