Methyl iodide exposure through nitrile gloves: cancer risk?

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MSDSs are full of cover-your-*** nonsense written by lawyers.

If you try and teach young chemists that every single chemical is highly dangerous, they will come to understand that you're exaggerating and they won't learn where *real* dangers exist.

Understanding, for example, the possible formation of organic peroxides in THF (and many other organic solvents) is very important. Understanding, for example, that DCM will go straight through nitrile gloves is very important.

Replacing real education and real chemistry literacy and real understanding of the realistic hazards of different chemicals with the overzealous language of MSDSs, implying that every chemical there is is scary, insidious and lethal is a mistake.
 
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minerva said:
MSDSs are full of cover-your-*** nonsense written by lawyers.

If you try and teach young chemists that every single chemical is highly dangerous, they will come to understand that you're exaggerating and they won't learn where *real* dangers exist.

Understanding, for example, the possible formation of organic peroxides in THF (and many other organic solvents) is very important. Understanding, for example, that DCM will go straight through nitrile gloves is very important.

Replacing real education and real chemistry literacy and real understanding of the realistic hazards of different chemicals with the overzealous language of MSDSs, implying that every chemical there is is scary, insidious and lethal is a mistake.

Nice try, but in addition to the legalese are the warnings you really DO need to know. I don't think anyone has suggested "Chemistry-By-The-Labels", so your education argument is a bombastic one, and a straw man. Read the label is a good idea, and no one is saying it's the ONLY thing you should do.
 
minerva said:
If you try and teach young chemists that every single chemical is highly dangerous, they will come to understand that you're exaggerating and they won't learn where *real* dangers exist.

Funny, because that's exactly how I learned these things.
By reading the relevant MSDSes for every chemical I was about to handle before every lab. Yes at first glance 'everything' would seem dangerous (and everything is, to an extent). But if you read more than one of them you quickly get a good understanding of relative dangers. An LD50 of 1000 mg/kg is quite safe, 1 mg/kg is not.

I think you're underestimating the ability of students to interpret and evaluate the data, and that the attitude you're espousing ("Don't bother reading the MSDS, it just says everything is bad!"), is a lot more dangerous than reading an MSDS ever would be.
 
alxm said:
Funny, because that's exactly how I learned these things.
By reading the relevant MSDSes for every chemical I was about to handle before every lab. Yes at first glance 'everything' would seem dangerous (and everything is, to an extent). But if you read more than one of them you quickly get a good understanding of relative dangers. An LD50 of 1000 mg/kg is quite safe, 1 mg/kg is not.

I think you're underestimating the ability of students to interpret and evaluate the data, and that the attitude you're espousing ("Don't bother reading the MSDS, it just says everything is bad!"), is a lot more dangerous than reading an MSDS ever would be.

This is the sensible approach in my view. If you can't figure out labels, maybe you shouldn't be in chemistry? :biggrin:
 
To be honest, I have to agree with previous comments. When you start out in chemistry it's not clear what's dangerous and what's not. And it doesn't help that you're not medically trained, so when you see "may cause cancer" or "may cause death" or whatever, it's difficult to interpret these warnings initially in any other way apart from "be extremely extremely careful" such that you're almost afraid to touch the bottle.

Look at the MSDS for DCM for example, it makes it sound like a chemical warfare agent...hence why I was frightend of alkyating agents like MeI...
 
alxm said:
Funny, because that's exactly how I learned these things.
By reading the relevant MSDSes for every chemical I was about to handle before every lab. Yes at first glance 'everything' would seem dangerous (and everything is, to an extent). But if you read more than one of them you quickly get a good understanding of relative dangers. An LD50 of 1000 mg/kg is quite safe, 1 mg/kg is not.

I think you're underestimating the ability of students to interpret and evaluate the data, and that the attitude you're espousing ("Don't bother reading the MSDS, it just says everything is bad!"), is a lot more dangerous than reading an MSDS ever would be.

Agreed, but most young student chemists aren't taught about LD50 values, at least I wasn't. You have to learn for yourself.