Two decades of chemical imaging of solutes in sediments and soils - a review

The increasing appreciation of the small-scale (sub-mm) heterogeneity of biogeochemical processes in sediments, wetlands and soils has led to the development of several methods for high-resolution two-dimensional imaging of solute distribution in porewaters. Over the past decades, localised sampling...

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Bibliographic Details
Published in:Analytica Chimica Acta
Main Authors: Santner, Jakob, Larsen, Morten, Kreuzeder, Andreas, Glud, Ronnie N.
Format: Article in Journal/Newspaper
Language:English
Published: 2015
Subjects:
Chemical imaging
Solute
Diffusive equilibration in thin films (DET)
Diffusive gradients in thin films (DGT)
Planar optodes
Luminescent sensors
PLASMA-MASS SPECTROMETRY
THIN-FILMS TECHNIQUE
DISSOLVED REACTIVE PHOSPHORUS
IN-SITU MEASUREMENTS
2-DIMENSIONAL PCO(2) DISTRIBUTIONS
HIGH-RESOLUTION MEASUREMENTS
HIGH-SPATIAL-RESOLUTION
PORE-WATER EXCHANGE
LOW IONIC-STRENGTH
ARCTIC SEA-ICE
Arctic
Sea ice
Online Access:https://pure.au.dk/portal/da/publications/two-decades-of-chemical-imaging-of-solutes-in-sediments-and-soils--a-review(58cbe968-9dcb-4143-8f59-7bf60d94fba6).html
https://doi.org/10.1016/j.aca.2015.02.006
Description
Summary:The increasing appreciation of the small-scale (sub-mm) heterogeneity of biogeochemical processes in sediments, wetlands and soils has led to the development of several methods for high-resolution two-dimensional imaging of solute distribution in porewaters. Over the past decades, localised sampling of solutes (diffusive equilibration in thin films, diffusive gradients in thin films) followed by planar luminescent sensors (planar optodes) have been used as analytical tools for studies on solute distribution and dynamics. These approaches have provided new conceptual and quantitative understanding of biogeochemical processes regulating the distribution of key elements and solutes including O-2, CO2, pH, redox conditions as well as nutrient and contaminant ion species in structurally complex soils and sediments. Recently these methods have been applied in parallel or integrated as so-called sandwich sensors for multianalyte measurements. Here we review the capabilities and limitations of the chemical imaging methods that are currently at hand, using a number of case studies, and provide an outlook on potential future developments for two-dimensional solute imaging in soils and sediments. (C) 2015 The Authors. Published by Elsevier B.V.

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