Home > Research > Publications & Outputs > Development of constrained DET for measurements...
View graph of relations

Development of constrained DET for measurements of dissolved iron in surface sediments at sub-mm resolution.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published

Standard

Development of constrained DET for measurements of dissolved iron in surface sediments at sub-mm resolution. / Fones, Gary R.; Davison, William; Grime, Geoff W.
In: Science of the Total Environment, Vol. 221, No. 2-3, 08.10.1998, p. 127-137.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

APA

Vancouver

Fones GR, Davison W, Grime GW. Development of constrained DET for measurements of dissolved iron in surface sediments at sub-mm resolution. Science of the Total Environment. 1998 Oct 8;221(2-3):127-137. doi: 10.1016/S0048-9697(98)00273-3

Author

Fones, Gary R. ; Davison, William ; Grime, Geoff W. / Development of constrained DET for measurements of dissolved iron in surface sediments at sub-mm resolution. In: Science of the Total Environment. 1998 ; Vol. 221, No. 2-3. pp. 127-137.

Bibtex

@article{c08437f30d0a498390a2d9a47abd09f6,
title = "Development of constrained DET for measurements of dissolved iron in surface sediments at sub-mm resolution.",
abstract = "The technique of diffusive equilibration in thin-films (DET) was used to measure pore-water concentrations of dissolved Fe at high (1 mm) and ultra-high (400 μm) spatial resolution in the surface sediments (0–12 mm) and immediate overlying water of Esthwaite Water, UK. DET measurements were made using an unconstrained DET probe and a new constrained DET probe with 200-μm wide compartments in a 400-μm thick ceramic sheet. Good agreement between profiles obtained by conventional and constrained DET measurements confirmed the performance of the new procedure, which in principle can be used to measure most major components of pore waters. Single point maxima observed with conventional DET were revealed as systematic peaks with constrained DET. All Fe pore-water profiles showed tightly defined maxima in the surface sediments. Double maxima observed for both spring and winter were probably due to tightly defined zones of bacterial oxidation of Fe(II) although sampling artifacts could not be completely ruled out. Differences in ultra-high resolution vertical concentration profiles measured only 2 mm apart provided evidence of small scale horizontal heterogeneity. Such observations suggest that fluxes through the sediment water interface calculated from concentration profiles should be treated as spatially specific values. Average fluxes can only be obtained from several replicate measurements.",
keywords = "Diffusive equilibrations in thin-films, Iron, Pore-waters, Sediment, Fluxes",
author = "Fones, {Gary R.} and William Davison and Grime, {Geoff W.}",
year = "1998",
month = oct,
day = "8",
doi = "10.1016/S0048-9697(98)00273-3",
language = "English",
volume = "221",
pages = "127--137",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier Science B.V.",
number = "2-3",

}

RIS

TY - JOUR

T1 - Development of constrained DET for measurements of dissolved iron in surface sediments at sub-mm resolution.

AU - Fones, Gary R.

AU - Davison, William

AU - Grime, Geoff W.

PY - 1998/10/8

Y1 - 1998/10/8

N2 - The technique of diffusive equilibration in thin-films (DET) was used to measure pore-water concentrations of dissolved Fe at high (1 mm) and ultra-high (400 μm) spatial resolution in the surface sediments (0–12 mm) and immediate overlying water of Esthwaite Water, UK. DET measurements were made using an unconstrained DET probe and a new constrained DET probe with 200-μm wide compartments in a 400-μm thick ceramic sheet. Good agreement between profiles obtained by conventional and constrained DET measurements confirmed the performance of the new procedure, which in principle can be used to measure most major components of pore waters. Single point maxima observed with conventional DET were revealed as systematic peaks with constrained DET. All Fe pore-water profiles showed tightly defined maxima in the surface sediments. Double maxima observed for both spring and winter were probably due to tightly defined zones of bacterial oxidation of Fe(II) although sampling artifacts could not be completely ruled out. Differences in ultra-high resolution vertical concentration profiles measured only 2 mm apart provided evidence of small scale horizontal heterogeneity. Such observations suggest that fluxes through the sediment water interface calculated from concentration profiles should be treated as spatially specific values. Average fluxes can only be obtained from several replicate measurements.

AB - The technique of diffusive equilibration in thin-films (DET) was used to measure pore-water concentrations of dissolved Fe at high (1 mm) and ultra-high (400 μm) spatial resolution in the surface sediments (0–12 mm) and immediate overlying water of Esthwaite Water, UK. DET measurements were made using an unconstrained DET probe and a new constrained DET probe with 200-μm wide compartments in a 400-μm thick ceramic sheet. Good agreement between profiles obtained by conventional and constrained DET measurements confirmed the performance of the new procedure, which in principle can be used to measure most major components of pore waters. Single point maxima observed with conventional DET were revealed as systematic peaks with constrained DET. All Fe pore-water profiles showed tightly defined maxima in the surface sediments. Double maxima observed for both spring and winter were probably due to tightly defined zones of bacterial oxidation of Fe(II) although sampling artifacts could not be completely ruled out. Differences in ultra-high resolution vertical concentration profiles measured only 2 mm apart provided evidence of small scale horizontal heterogeneity. Such observations suggest that fluxes through the sediment water interface calculated from concentration profiles should be treated as spatially specific values. Average fluxes can only be obtained from several replicate measurements.

KW - Diffusive equilibrations in thin-films

KW - Iron

KW - Pore-waters

KW - Sediment

KW - Fluxes

U2 - 10.1016/S0048-9697(98)00273-3

DO - 10.1016/S0048-9697(98)00273-3

M3 - Journal article

VL - 221

SP - 127

EP - 137

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

IS - 2-3

ER -