Sorry one more thing in case peeps are concerned about sulfuric acid vapors hurting them:<br><br>Since I typically work with this stuff in a fume hood, I double checked to make
sure volatility was not really that high. Sure enough, from an MSDS
(different than the one I sent out), the Vapor Pressure was listed as
only <0.001 mmHg @ 25C. Thus at room temp less than 0.001/760 of the air
will be sulfuric acid vapor at any time. The TWA exposure for sulfuric acid as listed by OSHA (the amount of the fumes you can be exposed to over a fixed time) is 1mg/m^3 averaged over an hour.<br><br>Doing some quick chemi-math:<br>
<br>Assuming ideal gas, i.e. PV=nRT<br>PV=nRT<br>(0.001/760 atm) = (n/V)*(0.0821 L*atm/mol*K)*(25+273 K)<br>n = 5.37*10^-8 mol/L present @ room temp<br><br>MW of sulfuric acid = 98.08g/mol = 98.08*1000 mg/mol, therefore:<br>
<br>at room temp, in a sealed system (room with absolutely no airflow), the fumes from sulfuric acid are at a concentration of _5.27*10^-6 mg/m^3_ which is about 100,000x less than the exposure limit as set by our government. <br>
<br>In sum, no need to be afraid of getting burned/cancer/whatevs unless you try really hard to kill yourself by heating this stuff to about 145C. I'll still put the sign on the door tho so people don't burn the place down on accident :-D.<br>
<br>Sean<br><br><br><div class="gmail_quote">On Sun, Aug 8, 2010 at 8:27 PM, Sean Cusack <span dir="ltr"><<a href="mailto:sean.p.cusack@gmail.com">sean.p.cusack@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Thanks for the feedback all. I'll add a sign to the outside of the darkroom warning people that chemicals are in use. I'll set up a wiki page with a nburl addy to convey the hazards of anything big as well.<br><br>
Seth - I don't think we want to go so far as to add a NFPA fire code label. The ratings that end up on those labels are *not* standardized. In other words, one site's flammability "4" rating may be a different site's "2" rating. The person who sets the rating is generally an assigned safety person with some kind of qualifications to be making those classifications based on their knowledge of the site's storage facilities and level of expertise. Since we don't really have one of those people, I don't really know who would assign the ratings.<br>
<br>Anyways, I'll get motorin' on a wiki site and a sexy sign for the door. Yay!<br><font color="#888888"><br>Sean</font><div><div></div><div class="h5"><br><br><div class="gmail_quote">On Sun, Aug 8, 2010 at 2:13 PM, Kelly <span dir="ltr"><<a href="mailto:hurtstotouchfire@gmail.com" target="_blank">hurtstotouchfire@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">There are nitrile cloves in the darkroom.<br>
<div><div></div><div><br>
On Sun, Aug 8, 2010 at 14:09, Kate McKinley <<a href="mailto:kate@lugh.net" target="_blank">kate@lugh.net</a>> wrote:<br>
> Nitrile gloves are better protection than latex rubber for acids and<br>
> various organic solvents, and have the bonus of being usable by people<br>
> with latex allergies.<br>
><br>
> --<br>
> Kate McKinley<br>
> <a href="mailto:kate@lugh.net" target="_blank">kate@lugh.net</a> <a href="mailto:kate@clp.ly" target="_blank">kate@clp.ly</a><br>
><br>
><br>
><br>
> On Sun, Aug 8, 2010 at 13:16, Sean Cusack <<a href="mailto:sean.p.cusack@gmail.com" target="_blank">sean.p.cusack@gmail.com</a>> wrote:<br>
>> I'll bring some gloves for sure. Its already in a sealed container for<br>
>> storage, so it should be cool there. Rameen - I believe its only an irritant<br>
>> (so if you step into a vapor of it, it'll burn your eyes and nose like mad).<br>
>> Plus, given that the boiling point of the acid is so high, its unlikely that<br>
>> you should ever inhale much of it without trying reeeeaaaally hard to do so<br>
>> :).<br>
>><br>
>> Sean<br>
>><br>
>> On Sun, Aug 8, 2010 at 1:02 PM, Rameen <<a href="mailto:emprameen@gmail.com" target="_blank">emprameen@gmail.com</a>> wrote:<br>
>>><br>
>>> I think it's toxic to inhale. I agree with Sai's suggestions.<br>
>>><br>
>>> On Sun, Aug 8, 2010 at 12:33 PM, Sean Cusack <<a href="mailto:sean.p.cusack@gmail.com" target="_blank">sean.p.cusack@gmail.com</a>><br>
>>> wrote:<br>
>>>><br>
>>>> Yo peeps -<br>
>>>><br>
>>>> A couple of us darkroomers are attempting to bring up an anodizing line<br>
>>>> for some sweet darkroom printing and other awesome Aluminum anodization<br>
>>>> needs. Cool, right? The only downside is that the anodizing bath is a 20%<br>
>>>> solution of sulfuric acid, thus meaning there is a sulfuric acid bath<br>
>>>> sitting in the darkroom.<br>
>>>><br>
>>>> This isn't retardedly hazardous or anything (for a hackerspace), but I<br>
>>>> wanted to throw this out as a quick FYI on how to clean this up if it ever<br>
>>>> happens to spill. If its on the ground thrown some baking soda on it first,<br>
>>>> watch it fizz like mad, then pick it up with a paper towel. Be really<br>
>>>> careful to not get this stuff on your skin - it will burn like crazy, and<br>
>>>> you'll get nasty red burns wherever it hit. If it does happen dump lots and<br>
>>>> lots and lots of water on it for 15 minutes. Also, realize that when water<br>
>>>> and sulfuric acid meet, a *ton* of heat is generated, so make sure to flush<br>
>>>> with cold water.<br>
>>>><br>
>>>> Lastly, don't throw mass quantities of this stuff down the drain - it'll<br>
>>>> corrode the plumbing pipes and potentially burn right through them. Yay the<br>
>>>> power of chemsitry.<br>
>>>><br>
>>>> Anyways, this stuff is being stored in the darkroom right now (kinda out<br>
>>>> of the way), but given that this is a little more less obvious of a hazard<br>
>>>> then a lot of stuff at NB, I thought I'd let everyone know. Questions or<br>
>>>> concerns, let me know!<br>
>>>><br>
>>>> Sean<br>
>>>><br>
>>>> P.S.> Full MSDS is here in case anyone is interested:<br>
>>>> <a href="http://www.sciencelab.com/msds.php?msdsId=9925146" target="_blank">http://www.sciencelab.com/msds.php?msdsId=9925146</a><br>
>>>><br>
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>>>><br>
>>><br>
>><br>
>><br>
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