Issue 7, 2004

Evaluation of a novel passive sampling technique for monitoring volcanogenic hydrogen sulfide

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.

Article information

Article type
Paper
Submitted
19 Jan 2004
Accepted
26 Mar 2004
First published
23 Apr 2004

J. Environ. Monit., 2004,6, 630-635

Evaluation of a novel passive sampling technique for monitoring volcanogenic hydrogen sulfide

C. J. Horwell, A. G. Allen, T. A. Mather and J. E. Patterson, J. Environ. Monit., 2004, 6, 630 DOI: 10.1039/B400746H

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