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Hydrogen Sulfide
h2s

_This is the organizing page for research related to hydrogen sulfide in Public Lab._ (above: [DIY colorimetric strips](/notes/megan/9-7-2012/first-experiment-analyzed) reacting to H2S by @megan) ### What is hydrogen sulfide, what are its effects, and where is it found? Hydrogen sulfide, with the chemical formula H2S, is a flammable gas that has a pungent odor at low concentrations and is odorless at higher concentrations. It can be a respiratory irritant and a neurotoxin. [Read more about hydrogen sulfide health effects](/wiki/hydrogen-sulfide-effects). Hydrogen sulfide is naturally formed in low-oxygen conditions with sulfate present, such as in organic-rich sediments and thus in petrochemical source rocks. Upon exposure to oxygen, hydrogen sulfide readily oxidizes to sulfur dioxide or sulfate, and generally reacts within hours to days. [Read more about hydrogen sulfide sources and spatial and temporal variation](/wiki/hydrogen-sulfide-environment) ### How are hydrogen sulfide emissions and exposures regulated? In the United States, hydrogen sulfide emissions are only federally regulated to the extent that they contribute to sulfur dioxide formation, and thus acid rain. These emissions are regulated through the Prevention of Significant Deterioration of major stationary sources review and permitting. Exposure to hydrogen sulfide is mostly regulated in terms of occupational exposure, with very few states regulating ambient exposure to this toxin. [Read more about hydrogen sulfide regulations](/wiki/hydrogen-sulfide-regulations) ## How can hydrogen sulfide be measured? While there is no federal regulatory method for hydrogen sulfide in the US, labs, agencies, and oilfield workers often measure hydrogen sulfide gas through several different means: * badges or glass tubes that change color * continuously sampling electronic sensors, some worn by oilfield workers * [air grab sampling](/wiki/air-sampling), as by the Bucket Brigades, tested with gas chromatography > We're compiling information about the **pros, cons, prices, and sensitivity/limitations** of these techniques: [What are different commercially available hydrogen sulfide detection methods?](/notes/warren/12-04-2017/what-are-different-commercially-available-hydrogen-sulfide-detection-methods) ## Do-It-Yourself approaches to detection There are three prototype, low-cost hydrogen sulfide detection methods currently being explored by Public Lab community members. These include: * a [method using photographic paper](/wiki/hydrogen-sulfide-photopaper) * a [copper tarnishing method](/wiki/hydrogen-sulfide-copper-pipe) * a technique using a [Do-It-Yourself potentiostat](/notes/JSummers/03-10-2014/quantifying-airborne-hydrogen-sulfide) * commercial [electronic H2S sensors](/wiki/hydrogen-sulfide-sensor) connected to a computer or #arduino > Help out! Please help link the above bullet points to corresponding pages across this site. **** ## Questions We can't make progress on these techniques and resources without addressing our unknowns. Please ask questions to help shape the direction of our work! [questions:hydrogen-sulfide] **** ## Related pages See [other related wiki pages here](https://publiclab.org/wiki/tag/hydrogen-sulfide) **** ## Activities These activities are to guide you to test out hydrogen sulfide detection methods or use these tools in the field: [activities:hydrogen-sulfide] **** ## Where can I find more information? Two particularly good resources are listed below. Other hydrogen sulfide wiki pages (mentioned above) include additional relevant resources. 1. Agency for Toxic Substance and Disease Registry. 2016. Hydrogen Sulfide Fact Sheet. [https://www.atsdr.cdc.gov/ToxProfiles/tp114-c1-b.pdf](https://www.atsdr.cdc.gov/ToxProfiles/tp114-c1-b.pdf). 2. National Research Council. 2010. Acute Exposure Guidelines. [https://www.epa.gov/sites/production/files/2014-11/documents/hydrogen_sulfide_final_volume9_2010.pdf](https://www.epa.gov/sites/production/files/2014-11/documents/hydrogen_sulfide_final_volume9_2010.pdf). ...


Author Comment Last activity Moderation
sara "Hi Mat, a couple of software developers from an opensource mapping project Rhus are going to try out your detection approach and mapping the result..." | Read more » over 10 years ago
MSGonzales "Thanks. I did place these myself, but the experiment was conducted just about a year ago. " | Read more » over 10 years ago
warren "Hi, Mathew - did you place these strips yourself? Recently? Very cool. " | Read more » over 10 years ago
sara "oops I accidentally posted that comment twice " | Read more » over 10 years ago
sara "Hi Matt! Thanks so much for this, I'm emailing this post and the post about our conversation to some of the people working on H2S in the gas patch..." | Read more » over 10 years ago
sara "We have marked the L type copper pipes with black tape. " | Read more » almost 11 years ago
sara "as much as possible given we're working in a dark room and so can't use the flash " | Read more » almost 11 years ago
sara "No! Great thought though we'll photo document the process of making batch 2. " | Read more » almost 11 years ago
warren "did you take any photos? " | Read more » almost 11 years ago
sara "So it can be more easily read here is the content from the document Kari attached: Oil & Gas Related Hydrogen Sulfide Myths Debunked Questi..." | Read more » almost 11 years ago
sara "I realized none of our notes so far cover how to make the glycerol solution, here is that protocol: 1) Wear plastic gloves and use thongs while ma..." | Read more » almost 11 years ago
warren "Wow, so is the attached picture a positive identification of H2S? What does a negative test look like? Do you have any photos of hanging it over a..." | Read more » almost 11 years ago
mathew "Sara- there's a chance we can make cheapo glove bags by heat sealing disposable polyethylene gloves for food service into clear trashbags. -what do..." | Read more » almost 11 years ago
sara "uncanny! " | Read more » about 11 years ago
warren "I seriously thought that was a picture of someone in a korean hanbok, maybe at a tea ceremony. " | Read more » about 11 years ago
warren "We should test the darkroom safelights with a spectrometer! Interesting presentation on darkroom safelights here (but dated to 1982, so out of dat..." | Read more » about 11 years ago
Shannon "We're working on making two layer coverings for the strips this week so that it is sealed from light, but air can flow through. They are coated wit..." | Read more » about 11 years ago
warren "wait, won't H2S go through paper? " | Read more » about 11 years ago
warren "cool - how will the control strip be kept from exposing? Will covering it with paper be enough? Or is it not treated with photo chemicals at all? " | Read more » about 11 years ago
jschaffr "Hi Jeff - The electronic sensor would be great. I understand that the results may not be completely conclusive on their own - but I was more intere..." | Read more » about 11 years ago
warren "Hey James - want to use the electronic hydrogen sulfide detector for this test also? It would be good to have a secondary means of measuring, as in..." | Read more » about 11 years ago