Date: Tue, 16 Aug 2011 13:44:33 -0600
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Alan Hall <ahalltoxic**At_Symbol_Here**MSN.COM>
Subject: Re: CAS #s for allotropes of phosphorus
Perhaps the "right" answer is to go to the CAS STN database and see
what they have on it?
Date: Tue, 16 Aug 2011 11:32:53 -0700
Subject: Re: [DCHAS-L] CAS #s for allotropes of phosphorus
I read your E-mail inquiry regarding various allotropes of phosphorous
and immediately opened my Merck Index. According to the Merck, t
here is only one CAS number for phosphorous [7723-14-0]. They do no
t provide individual CAS numbers for the different allotropes. It a
lso states that there are three main allotropic forms: white, black and r
ed. White is sometimes refered to as yellow as a result of impuriti
es, while red is sometimes refered to as violet. I also checked t
he CRC Handbook of Chemistry and Physics just for confirmation.
; The Merck Index provides some health and safety information.
John D. Turner
--- On Tue, 8/16/11, ACTSNYC**At_Symbol_Here**CS.COM <ACTSNYC**At_Symbol_Here**CS.COM
From: ACTSNYC**At_Symbol_Here**CS.COM <ACTSNYC**At_Symbol_Here**CS.COM
Subject: [DCHAS-L] CAS #s for allotropes of phosphorus
Date: Tuesday, August 16, 2011, 6:46 AM
Is anyone out there, or does anyone know, an expert on th
e allotropes of phosphorus?
I'm working on the health effec
ts for the chemicals listed in the next edition of the Dictionary of Pyrote
chnics--a freebie for a pal I work with on NFPA 1126, the standard of pyr
o before a proximate audience.
My old Hawleys gives on CAS # 7723-14
-0 to all forms and says elemental phosphorus can have allotropes that are
"white (or yellow), red, and black." Other references list a br
own allotrope as well.
Here's the deal. ACGIH has two entri
es in their big exposure guide booklet:
* White phosphorus CAS# 772
3-14-0 which has no TLV, but a DFG MAK 0.05 mg/m3.
* Yellow phosph
orus CAS# 12185-10-3 has a TLV-TWA 0.1 mg/m3; MAK 0.05 and a NIOSH REL of
And there's no entry for red phosphorus or any other col
Pyrotechs use white and red. And their suppliers as well
as other experts list the White as CAS 7723-14-0 and Red as 12185-10-3.&nb
sp; And if I google various sources I can get different CAS numbers almos
t at will. They all contradict each other.
Does anyone know if white
and yellow are really different allotropes? Does anyone kn
ow which CAS # goes with which? Specifically is the
CAS# 12185-10-3 for yellow or for red? It's to look like ACGIH mig
ht be wrong on this one.
Thanks for thinking on this.
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