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Question:How can we safely try out and evaluate a hydrogen sulfide test?

warren asked on November 28, 2017 22:30
78 | 4 answers | shortlink


There are a few different methods being tested out for detecting hydrogen sulfide, and given that it's toxic, how can we validate these as part of our process of developing & refining them?

Read more: https://publiclab.org/wiki/hydrogen-sulfide

I suspect there's a lot of ideas and clues buried in this research from over the years: #hydrogen-sulfide

I'd guess we need a known source of H2S -- and a safe way to interact with it.



hydrogen-sulfide h2s validation h2s-copper-pipe

question:h2s question:hydrogen-sulfide question:h2s-copper-pipe question:validation



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4 Answers

I see a couple leads here, one by @jschaffr :

@JSummers especially has thought through the disposal question a good bit, happily.

@sophie also had a post up on using a flame hood for protection -- i think this one: https://publiclab.org/notes/sophie/07-16-2014/sensing-hydrogen-sulfide-from-cafo-emissions-in-poweshiek-county-iowa

I know that test didn't seem to have worked out, but based on what Sophie wrote, I think there may be some good ways to build on that as a framework for validation:

I am currently doing a trial run to test whether the samplers can, under laboratory conditions, detect H2S levels at or below 30 ppm. I obtained 6 25-gallon emergency water storage bags and placed two treated photo paper strips in each (film canisters wouldn’t fit through the openings). Each bag was then filled with 0, 5, 10, 20, 30, or 50 ppb of H2S, shaking them every day to ensure even gas distribution. After two weeks, I retrieved and fixed the paper to determine if any darkening has occurred. The results seem to indicate that either this technique is not sensitive enough to detect such low levels of H2S, or that this method of testing was problematic (picture below).


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Also, not that this sounds ideal, but these two students did some good documentation and work on detecting h2s from bodily sources, so to speak: https://publiclab.org/notes/warren/9-6-2011/hydrogen-sulfide-detection-fart-detector


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And @sara noted these glove bags for working with toxic materials: https://publiclab.org/notes/sara/2-6-2012/hydrogen-sulfide-testing-glove-bag


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For what it's worth, you can buy H2S gas here for $189, but I think I'd think twice about doing so given how toxic it is: https://www.durawear.com/msa-10153844-econo-cal-calibration-gas-34-liter-20-ppm-h2s-smart-rfid-ring-for-gx2-smart-cylinder-holder/


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