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In situ, high resolution measurement of dissolved sulfide using diffusive gradients in thin films with computer-imaging densitometry.

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In situ, high resolution measurement of dissolved sulfide using diffusive gradients in thin films with computer-imaging densitometry. / Teasdale, Peter R.; Hayward, Sean; Davison, William.

In: Analytical Chemistry, Vol. 71, No. 11, 01.06.1999, p. 2186-2191.

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Teasdale, Peter R. ; Hayward, Sean ; Davison, William. / In situ, high resolution measurement of dissolved sulfide using diffusive gradients in thin films with computer-imaging densitometry. In: Analytical Chemistry. 1999 ; Vol. 71, No. 11. pp. 2186-2191.

Bibtex

@article{ae66b0608cc64bc7b67fee1a6b85ec62,
title = "In situ, high resolution measurement of dissolved sulfide using diffusive gradients in thin films with computer-imaging densitometry.",
abstract = "The technique of diffusive gradients in thin films (DGT) has been developed for the measurement of dissolved sulfide. Sulfide species from the sampled waters diffuse through a polyacrylamide hydrogel and then react with pale yellow AgI(s), incorporated at the surface of a second gel, to form black Ag2S(s). The accumulated sulfide can be measured with a conventional purge-and-trap method followed by colorimetry (methylene blue). This enables the dissolved-sulfide concentration to be calculated under suitable conditions. Alternatively, the color change in the accumulating gel can be used to measure sulfide. A conventional flat-bed scanner, allied to imaging software, provided a densitometric measurement that was quantitatively related to the amount of sulfide accumulated. DGT measurements on synthetic solutions accurately determined the sulfide concentration (95% recovery), thereby confirming the unobstructed diffusion of HS- through the gel. The accumulated mass was inversely proportional to the diffusion-layer thickness as theoretically predicted. With the selected geometry, the limit of detection of the densitometric procedure for a 24-h deployment was 0.13 μmol L-1, and the maximum concentration measurable was 60 μmol L-1. When used in anoxic lacustrine waters, DGT provided sensible concentrations. It was also used to measure depth profiles at submillimeter resolution in estuarine surface sediments.",
author = "Teasdale, {Peter R.} and Sean Hayward and William Davison",
year = "1999",
month = jun
day = "1",
doi = "10.1021/ac981329u",
language = "English",
volume = "71",
pages = "2186--2191",
journal = "Analytical Chemistry",
issn = "0003-2700",
publisher = "American Chemical Society",
number = "11",

}

RIS

TY - JOUR

T1 - In situ, high resolution measurement of dissolved sulfide using diffusive gradients in thin films with computer-imaging densitometry.

AU - Teasdale, Peter R.

AU - Hayward, Sean

AU - Davison, William

PY - 1999/6/1

Y1 - 1999/6/1

N2 - The technique of diffusive gradients in thin films (DGT) has been developed for the measurement of dissolved sulfide. Sulfide species from the sampled waters diffuse through a polyacrylamide hydrogel and then react with pale yellow AgI(s), incorporated at the surface of a second gel, to form black Ag2S(s). The accumulated sulfide can be measured with a conventional purge-and-trap method followed by colorimetry (methylene blue). This enables the dissolved-sulfide concentration to be calculated under suitable conditions. Alternatively, the color change in the accumulating gel can be used to measure sulfide. A conventional flat-bed scanner, allied to imaging software, provided a densitometric measurement that was quantitatively related to the amount of sulfide accumulated. DGT measurements on synthetic solutions accurately determined the sulfide concentration (95% recovery), thereby confirming the unobstructed diffusion of HS- through the gel. The accumulated mass was inversely proportional to the diffusion-layer thickness as theoretically predicted. With the selected geometry, the limit of detection of the densitometric procedure for a 24-h deployment was 0.13 μmol L-1, and the maximum concentration measurable was 60 μmol L-1. When used in anoxic lacustrine waters, DGT provided sensible concentrations. It was also used to measure depth profiles at submillimeter resolution in estuarine surface sediments.

AB - The technique of diffusive gradients in thin films (DGT) has been developed for the measurement of dissolved sulfide. Sulfide species from the sampled waters diffuse through a polyacrylamide hydrogel and then react with pale yellow AgI(s), incorporated at the surface of a second gel, to form black Ag2S(s). The accumulated sulfide can be measured with a conventional purge-and-trap method followed by colorimetry (methylene blue). This enables the dissolved-sulfide concentration to be calculated under suitable conditions. Alternatively, the color change in the accumulating gel can be used to measure sulfide. A conventional flat-bed scanner, allied to imaging software, provided a densitometric measurement that was quantitatively related to the amount of sulfide accumulated. DGT measurements on synthetic solutions accurately determined the sulfide concentration (95% recovery), thereby confirming the unobstructed diffusion of HS- through the gel. The accumulated mass was inversely proportional to the diffusion-layer thickness as theoretically predicted. With the selected geometry, the limit of detection of the densitometric procedure for a 24-h deployment was 0.13 μmol L-1, and the maximum concentration measurable was 60 μmol L-1. When used in anoxic lacustrine waters, DGT provided sensible concentrations. It was also used to measure depth profiles at submillimeter resolution in estuarine surface sediments.

U2 - 10.1021/ac981329u

DO - 10.1021/ac981329u

M3 - Journal article

VL - 71

SP - 2186

EP - 2191

JO - Analytical Chemistry

JF - Analytical Chemistry

SN - 0003-2700

IS - 11

ER -