On Thu, May 3, 2012 at 11:12 AM, <dick.spra
...@comcast.net> wrote:
> Let's be careful, folks. Hydrogen sulfide is extremely dangerous (as one
> of the links in the email chain below indicates, it is similar to hydrogen
> cyanide {the execution gas} in toxicity). It should be generated with
> extreme care, only by a professional chemist, and only in a laminar flow
> hood to channel the hydrogen sulfide away from the person generating it. As
> another of the links in the email chain cites, it is also very difficult to
> generate a controlled flow of a constant concentration of H2S gas (both
> requirements for a standard gas solution). Generating hydrogen sulfide gas
> using a cookbook procedure and without proper protection is following a
> recipe for a potentially tragic death.
> Hydrogen sulfide detectors are available for rental through various
> sources, and cost approx $25 per day. These detectors should come
> pre-calibrated and ready to use; if rented for multiple days, they should
> come with a calibration kit, including directions. See
> http://www.idealcalibrations.com/gas-detector-rental/ for one example.
> Rental agencies exist in almost every major city, so shipping costs should
> not apply.
> These detectors are also available for sale, but then you would need to
> have the standard gas, and this would essentially double the first cost
> price to around $400 for just the H2S monitoring capability.
> Is the public laboratory a 501(c)(3) organization? Could it qualify as a
> professional or educational organization, even if loosely affiliated? If
> yes, you might find vendors or other parties that are willing and able to
> donate this equipment, sell it at a discount, make a donation toward
> purchase, etc. in exchange for a tax write-off. I am currently a member of
> two 501(c)(3) organizations (ASTM.org and SWANA.org) which accept
> sponsorships from various vendors in exchange for access to members at
> defined times and places. I would be willing to help register the public
> laboratory as a 501(c)(3) organization if this seems worthwhile to
> accomplishing your goals.
> Dick Sprague
> ------------------------------
> *From: *"Jeffrey Warren" <j...@publiclaboratory.org>
> *To: *publiclaboratory@googlegroups.com
> *Sent: *Wednesday, May 2, 2012 4:05:36 PM
> *Subject: *Re: [PLOTS] Access to Hydrogen Sulfide?
> A quick googling shows:
> * http://en.wikipedia.org/wiki/Hydrogen_sulfide#Production
> * http://forums.homesciencelab.com/viewtopic.php?f=7&t=72 (DIY)
> *
> http://www.sustainablesupply.com/MSA-711062-Calibration-Gas-40-Ppm-Hy... for
> $157
> On Wed, May 2, 2012 at 5:59 PM, Sara Ann Wylie <sawy...@mit.edu> wrote:
>> Hi all,
>> We are getting ready to begin lab testing to calibrate our photographic
>> paper
>> strips. For research notes on this see below. Unfortunately tanks of
>> Hydrogen
>> Sulfide are quite costly. Does anyone have access to Hydrogen Sulfide? Or
>> a
>> good protocol for making it in known quantities?
>> Cheers
>> Sara
>> Links to work on this project:
>> Description of what we have for the experimental set up:
>> http://publiclaboratory.org/notes/sara/4-2-2012/planning-public-lab-h...
>> Description of prior lab research on this tool:
>> http://publiclaboratory.org/notes/sara/3-30-2012/description-horwell-...
>> Draft Experimental Design:
>> http://publiclaboratory.org/notes/sara/4-2-2012/h2s-experimental-set-...
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