Evaluation of a novel passive sampling technique for monitoring volcanogenic hydrogen sulfide
Identifieur interne : 000172 ( Main/Merge ); précédent : 000171; suivant : 000173Evaluation of a novel passive sampling technique for monitoring volcanogenic hydrogen sulfide
Auteurs : Claire J. Horwell [Royaume-Uni] ; Andrew G. Allen [Royaume-Uni] ; Tamsin A. Mather [Royaume-Uni] ; John E. Patterson [Nouvelle-Zélande]Source :
- Journal of Environmental Monitoring [ 1464-0325 ] ; 2004.
Descripteurs français
- Wicri :
- topic : Sciences de la terre.
English descriptors
- KwdEn :
- Absorbent layer, Absorption characteristics, Active samplers, Ambient, Aqueous medium, Canister, Chamber experiments, Charles austen, Chem, Chemical composition, Cold water, Colour, Colour change, Colour change reaction, Colour changes, Different ambient, Earth sciences, Environ, Exposure duration, Gelatine layer, Geotherm, Geothermal areas, Lower concentrations, Lter, Lter samplers, Lters, Monit, Na2s solution, Paper strips, Passive samplers, Passive sampling technique, Photographic paper, Photographic paper strips, Rotorua, Rotorua samplers, Sample collection, Sampler, Silver halide, Silver nitrate, Total volume, Typical calibration curve, Uorescein mercuric acetate, Uorescence, Uorescence signal, Uptake rate, Visible colour change, Visible evidence, Visual observation, Volcanic, Volcanic activity, Volcanol, Xing process.
- Teeft :
- Absorbent layer, Absorption characteristics, Active samplers, Ambient, Aqueous medium, Canister, Chamber experiments, Charles austen, Chem, Chemical composition, Cold water, Colour, Colour change, Colour change reaction, Colour changes, Different ambient, Earth sciences, Environ, Exposure duration, Gelatine layer, Geotherm, Geothermal areas, Lower concentrations, Lter, Lter samplers, Lters, Monit, Na2s solution, Paper strips, Passive samplers, Passive sampling technique, Photographic paper, Photographic paper strips, Rotorua, Rotorua samplers, Sample collection, Sampler, Silver halide, Silver nitrate, Total volume, Typical calibration curve, Uorescein mercuric acetate, Uorescence, Uorescence signal, Uptake rate, Visible colour change, Visible evidence, Visual observation, Volcanic, Volcanic activity, Volcanol, Xing process.
Abstract
A novel, low-cost passive sampling procedure for monitoring of volcanogenic hydrogen sulfide is reported. The technique is based on absorption of H2S onto treated sections of photographic paper, which are housed in plastic film canisters during exposure. The H2S reacts with silver halide in the photographic paper, causing a colour-change reaction from white, through brown, to black, depending on concentration of atmospheric H2S. The sampler is sensitive to ≪30 ppb to ∼1000 ppb of H2S. Here we present results from a series of optimization and quantification experiments. An active sampling procedure for rapid H2S measurement is also reported, based on absorption of H2S onto Whatman No. 41 cellulose filters treated with silver nitrate, and was shown to be quantitative using a single filter at flow rates <1.0 L min−1 for collection of <200 μg of sulfide (as H2S). Determination of sulfide collected on the substrates was performed using a rapid flow-injection technique based on the fluorescence quenching of fluorescein mercuric acetate (FMA) by sulfide. This was optimized at a FMA concentration of 8 mg L−1, at which 100% quenching was obtained at a solution sulfide concentration of 3 mg L−1.
Url:
DOI: 10.1039/b400746h
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<term>Silver nitrate</term>
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<front><div type="abstract">A novel, low-cost passive sampling procedure for monitoring of volcanogenic hydrogen sulfide is reported. The technique is based on absorption of H2S onto treated sections of photographic paper, which are housed in plastic film canisters during exposure. The H2S reacts with silver halide in the photographic paper, causing a colour-change reaction from white, through brown, to black, depending on concentration of atmospheric H2S. The sampler is sensitive to ≪30 ppb to ∼1000 ppb of H2S. Here we present results from a series of optimization and quantification experiments. An active sampling procedure for rapid H2S measurement is also reported, based on absorption of H2S onto Whatman No. 41 cellulose filters treated with silver nitrate, and was shown to be quantitative using a single filter at flow rates <1.0 L min−1 for collection of <200 μg of sulfide (as H2S). Determination of sulfide collected on the substrates was performed using a rapid flow-injection technique based on the fluorescence quenching of fluorescein mercuric acetate (FMA) by sulfide. This was optimized at a FMA concentration of 8 mg L−1, at which 100% quenching was obtained at a solution sulfide concentration of 3 mg L−1.</div>
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