A modified DGT technique for the simultaneous measurement of dissolved inorganic nitrogen and phosphorus in freshwaters

Huang, Jianyin; Bennett, William W.; Teasdale, Peter R.; Kankanamge, Nadeeka Rathnayake; Welsh, David T.

doi:10.1016/j.aca.2017.08.024

Cited by 31 publications

(16 citation statements)

References 42 publications

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“…Huang et al (2016a, b) compared labile concentrations determined by DGT and grab sample for NH 4 -N and NO 3 -N concentrations in freshwater, respectively. Results showed C DGT : C SOL = 0.83-1.3 for NH 4 -N, and C DGT : C SOL = 1.03-1.04 for NO 3 -N. Huang et al (2017) further measured dissolved inorganic nitrogen (PrCH resin for NH 4 -N and A520E resin for NO 3 -N) and phosphorus (Metsorb for PO 4 -P) simultaneously in freshwater using a hybrid DGT. The ratio C DGT /C SOL was 0.83-1.3 for NH 4 -N, NO 3 -N and PO 4 -P, which demonstrated a high level of measurement accuracy for the new DGT.…”

Section: Measurement Of Time-averaged Concentrationsmentioning

confidence: 96%

Diffusive gradients in thin films: devices, materials and applications

Ding

Yang

et al. 2018

Environ Chem Lett

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Measurement Of Time-averaged Concentrationsmentioning

confidence: 96%

Diffusive gradients in thin films: devices, materials and applications

Ding

Yang

et al. 2018

Environ Chem Lett

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“…Temporal variations in the concentration of pollutants are frequent in natural waters as a result of the dynamics of natural and anthropogenic cycles. The integrative nature of DGT passive samplers suggests that they can provide timeweighted average (TWA) concentrations of the analytes over the deployment time, in contrast with conventional grab sampling (which yields a snapshot of the sampling site at one particular moment; Allan et al, 2007;Dunn et al, 2007;Huang et al, 2016Huang et al, , 2017. The response of DGT devices to changes in concentration during the deployment time has been studied both theoretically and experimentally through DGT deployments in solutions of different concentrations during controlled time periods (Altier et al, 2019).…”

Section: Dgt As a Time-weighted Average Concentrationmentioning

confidence: 99%

Speciation of Inorganic Compounds in Aquatic Systems Using Diffusive Gradients in Thin-Films: A Review

et al. 2021

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The speciation of trace metals in an aquatic system involves the determination of free ions, complexes (labile and non-labile), colloids, and the total dissolved concentration. In this paper, we review the integrated assessment of free ions and labile metal complexes using Diffusive Gradients in Thin-films (DGT), a dynamic speciation technique. The device consists of a diffusive hydrogel layer made of polyacrylamide, backed by a layer of resin (usually Chelex-100) for all trace metals except for Hg. The best results for Hg speciation are obtained with agarose as hydrogel and a thiol-based resin. The diffusive domain controls the diffusion flux of the metal ions and complexes to the resin, which strongly binds all free ions. By using DGT devices with different thicknesses of the diffusive or resin gels and exploiting expressions derived from kinetic models, one can determine the labile concentrations, mobilities, and labilities of different species of an element in an aquatic system. This procedure has been applied to the determination of the organic pool of trace metals in freshwaters or to the characterization of organic and inorganic complexes in sea waters. The concentrations that are obtained represent time-weighted averages (TWA) over the deployment period.

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“…There are a few studies in the literature about the response of DGT devices to changes in concentration during the deployment time. Some of these works deal with metals [6,17,18], but others are applied to toxic organic compounds [13,16,19,20], or to nutrients such as inorganic P or N [21][22][23]. Although most of the concepts here developed can be useful in the measurement of TWA concentrations of most analytes of environmental interest, this work focusses on the case of metals.…”

Section: Introductionmentioning

confidence: 99%