Re: Humidity calibration: Table salt V pure NaCl


"Ron Jones" <ron@xxxxxxxxxxxxxxx> wrote in message
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K Ludger wrote:
"Bill Penrose" <dangerousbill@xxxxxxxxx> wrote in message
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On Nov 6, 6:24 pm, "Rob D" <inva...@xxxxxxxxxxx> wrote:
Oh - another question.....am I correct in assuming that commercial
argon shield gas mix from a high pressure cylinder will contain no
water & be useful for creating a 0% RH calibration environment?

Yes, it's about as dry as you can get it without resorting to
phosphorus pentoxide.

Table salt has a little gypsum in it to avoid caking.

Depends where you live - Europe uses E535 : Sodium ferrocyanide to stop
caking.

--
Ron Jones
Process Safety & Development Specialist
Don't repeat history, unreported chemical lab/plant near misses at
http://www.crhf.org.uk Only two things are certain: The universe and
human stupidity; and I'm not certain about the universe. ~ Albert
Einstein


Hi Ron - interesting, I looked up E535 on wiki, early in the piece they too
mention it as an anticaking agent. The msds below has it as extremely
hazardous in case of ingestion.
I guess quantity must be the detemining factor.

http://www.sciencelab.com/xMSDS-Sodium_ferrocyanide-9924987


.

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