vmelkon
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How toxic is H2S?
How toxic is H2S?
I made some Al2S3 by direct reaction of the elements.
I took a couple of whiffs and I could smell the rotten eggs smell.
It’s an interesting compound. I don’t think I ever smelled the rotten egg smell when I made CuS and FeS.
~~~~vmelkon
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We must attach the electrodes of knowledge to the nipples of ignorance and give a few good jolts.
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DraconicAcid
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The iron and copper sulphides are very insoluble, and won't hydrolyze with moisture. Aluminum sulphide will.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Velzee
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They say it's similar to HCN, but the numbers tell otherwise: LC50 H2S 800 ppm (human, 5 min), LC50 HCN 200 ppm (mammal, 5 min).
Al2S3 reacts with water to form H2S: Al2S3 + 6H2O --> 2Al(OH)3 + 3H2S
Check out the ScienceMadness Wiki: http://www.sciencemadness.org/smwiki/index.php/Main_Page
"All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident."
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B(a)P
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It is quite toxic, with symptoms experienced at concentrations as low as 5 ppm.
Exposure at concentrations greater than 100 ppm will potentially lead to eye and respiratory tract damage.
Exposure at concentrations greater than 1000 ppm will likely result in immediate unconsciousness followed shortly by death due to paralysis of the
respiratory centre in the brain.
If you experienced a headache, sore eyes or irritated airways you were likely exposed to 5 to 20 ppm.
You can detect the odour at concentrations lower than 1 ppm, but will quickly become desensitised to the odour.
For a once off exposure, if you had no to mild symptoms, then you have little to worry about.
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FrenchChemist
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Exactly, the worst thing about H2S is that at a certain concentration it paralyzes the sense of smell, therefore the path to further inhaling
completely unconsciously and taking a lethal dose is very short.
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j_sum1
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I am maybe a bit overfamiliar with H2S. Growing up I frequented geothermal regions where you could smell on a daily basis the H2S arising from the
ground and stormwater drains: generally accompanied by a lot of water vapour as well. Ambient air in Rotorua gets as high as 0.03ppm and I am very
familiar with that level.
So, now, if I smell H2S then I associate it with those memories. I am confident that concentrations above the odour threshhold are not going to do me
any harm.
However, if it becomes too whiffy, enough to be unpleasant, then I know I am above the levels I want. And I know that at higher levels I am likely to
be desensitised, although, I have never experienced levels that high.
In practice, I don't shy away from H2S but I do take precautions: scrubbing and fume-hood if possible. If a little gas escapes or I am doing something
at small test-tube scale and I smell it, I am not at all worried.
If I have to do anything that is likely to produce significant quantities (and I have some future projects that will) then I intend to set up a good
scrubbing system, work in a fume hood and also set up some test strips. I don't intend to rely on smell for safety. Nor am I going to freak out if I
do happen to smell a small amount. It is also useful to do a quick calculation to find out how much you are making and what the maximum concentration
in your workplace might be.
HCN I really don't have experience with. I do not know its smell and I understand that some people cannot smell it anyway. Not that I have had any
need up to this point, but when I do end up working with HCN, I am likely to be a lot more nervous than I would be with H2S.
I feel like I have waffled. I guess I am saying that experience, confidence, and knowledge, as well as quantity control, are just as valuable in
mitigating hazards as any amount of PPE or other safety measures. Where there exist suitable sensory indicators of danger then it is useful to know
them and work with them. But without appropriate knowledge, smell is is a really unreliable indicator.
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Fluorite
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I've never smelled rotten eggs when working with H2S! The smell is disgusting but like lemons IMO :3
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FrenchChemist
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I think a lot depends on the method of obtaining it.
Most are synthesized from sodium sulfide or Iron (II) sulfide.
I had very pure sodium sulfide at my disposal as well as very yellow (technical) - in my opinion, in a large number of people the "admixture" of
impurities has a significant impact on the smell.
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vmelkon
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Well, the good news is, that I am fine.
The next step is to convert that into hydrosulfuric acid. I will be doing test tube quantity, actually, 25% of a test tube. Maybe I have 3 g of Al2S3.
Signature ==== Is this my youtube page? https://www.youtube.com/watch?v=tA5PYtul5aU
We must attach the electrodes of knowledge to the nipples of ignorance and give a few good jolts.
Yes my evolutionary friends. We are all homos here. |
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xxxhibition
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Quote: Originally posted by FrenchChemist  |
 from Childhood to now in Test Tube Sizes a lot of Fun here gasing my Workshop
Neighbours.
I think a lot depends on the method of obtaining it.
Most are synthesized from sodium sulfide or Iron (II) sulfide.
I had very pure sodium sulfide at my disposal as well as very yellow (technical) - in my opinion, in a large number of people the "admixture" of
impurities has a significant impact on the smell. |
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zed
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H2S and HCN? I fear them equally. And, that's plenty.
Lots of H2S around. Gives you something to think about.
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