About This Archive  | DCHAS-L 2011 Index   | DCHAS-L Yearly Index
person wearing a disposable face shield and surgical style mask

Check out Safety Emporium for your N95, N99, and face shield needs.

Previous by Date:
Subject: Re: CAS #s for allotropes of phosphorus
Date: Tue, 16 Aug 2011 20:51:29 -0400
Author: ACTSNYC**At_Symbol_Here**CS.COM 		Next by Date:
Subject: Chemical Safety Headlines From Google (17 articles)
Date: Wed, 17 Aug 2011 08:24:28 -0400
Author: "Secretary, ACS Division of Chemical Health and Safety"


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
In-Reply-To: <1313519573.46438.YahooMailClassic**At_Symbol_Here**web130211.mail.mud.yahoo.com>

Perhaps the "right" answer is to go to the CAS STN database and see what they have on it?
 
Alan
 
Date: Tue, 16 Aug 2011 11:32:53 -0700
From: dura_chemiker**At_Symbol_Here**YAHOO.COM
Subject: Re: [DCHAS-L] CAS #s for allotropes of phosphorus
To: DCHAS-L**At_Symbol_Here** LIST.UVM.EDU

Monona,
 
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 > wrote:

From: ACTSNYC**At_Symbol_Here**CS.COM <ACTSNYC**At_Symbol_Here**CS.COM >
Subject: [DCHAS-L] CAS #s for allotropes of phosphorus
To: DCH AS-L**At_Symbol_Here**LIST.UVM.EDU
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 0.1 mg/m3.

And there's no entry for red phosphorus or any other col or.

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.

Monona< BR>

Previous post   |  Top of Page   |   Next post


The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to secretary@dchas.org.
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.