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zed
International Hazard
Posts: 2283
Registered: 6-9-2008
Location: Great State of Jefferson, City of Portland
Member Is Offline
Mood: Semi-repentant Sith Lord
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I have a lot of high-tech respiratory protection. The first thing your instructions tell you is: Not for use in atmospheres that are immediately
hazardous to life.
The Mask is meant to be back-up, not primary protection. A good, well sealed, full face respirator, equipt with an appropriate, freshly opened, high
quality gas mask cartridge, offers pretty good protection even from nerve gases....In low concentrations. But, it is transient protection. As soon
as possible, leave the area and decontaminate.
If you really, gotta work in a truly hazardous atmosphere, a mask supplied by a remote air supply is required.
Either outside air supply via hose, or an SCBA set-up is required. SCBA is firefighter stuff.
Scavenging Gold? Easily done with HCl and H2O2. Lots of examples on YouTube. Not very dangerous.
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Fyndium
International Hazard
Posts: 1192
Registered: 12-7-2020
Location: Not in USA
Member Is Offline
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I never count my ABEK mask as a protection, but a back-up. Maybe sounds stupid, but I reactively hold my breath when handling very toxic stuff which
can/could give off vapors. When I had to handle that NO2 mess, I took a deep breath and took determined steps to quench and dump the reaction, put the
flask on firm stand, stepped back and then breathed again. I did not have my mask at hand because I was not prepared to such fumes since the
instructables just mentioned an inverted funnel, which had pretty much zero effect when the reaction took on. Water, even with conc lye, does not
absorb NO2 in such quantities a single trap would be sufficient.
I took care of the issue by fixing my fume hood directly to the overhead stove hood, which pulls stuff up to the skies safely. Now I can just put the
hose directly on the suction of my hood to vent all nasties directly to the atmosphere. Prior, I used activated carbon filter.
High risk occupations do indeed use rebreather with air reservoir or external positive pressure air supply via line. HCN is one of such stuff that is
instructed to be handled only with such equipment, never with respirator mask only. This may of course differ in an industrial setting where several
tons of cyanides can be handled and hence even small fumes can bring concentrations up to immediately fatal levels. Compared to a chemist handling a
pound-bottle of KCN very briefly with a spatula, the difference is huge.
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zed
International Hazard
Posts: 2283
Registered: 6-9-2008
Location: Great State of Jefferson, City of Portland
Member Is Offline
Mood: Semi-repentant Sith Lord
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Inverted funnel? Yes, I've used inverted funnel set-ups. Mostly with HCl gas. But, the funnel is used as a collector, connected to a remote
water-driven aspirator pump. Which sucks gases to a distant location, and entrains them in water. This is an active system. Intervening traps may be
added
I know that some folks direct exhaust gasses into an inverted funnel, large end, inverted over water, expecting the water to suck up the noxious
gases. Never tried it.
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