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Date: Tue, 16 Aug 2011 11:32:53 -0700
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: Mr John David Turner <dura_chemiker**At_Symbol_Here**YAHOO.COM>
Subject: Re: CAS #s for allotropes of phosphorus
In-Reply-To: <22f05.18fb7250.3b7bceb5**At_Symbol_Here**cs.com>
--0-1956968259-1313519573=:46438
Monona,
=A0
I read your E-mail inquiry regarding various allotropes of phosphorous and
immediately opened my Merck Index.=A0 According to the Merck, there is only
one CAS number for phosphorous [7723-14-0].=A0 They do not provide individ
ual CAS numbers for the different allotropes.=A0 It also states that there
are three main allotropic forms: white, black and red.=A0 White is sometime
s refered to as yellow as a result of impurities, while red is sometimes re
fered to as violet.=A0 I also checked the CRC Handbook of Chemistry and Phy
sics just=A0for confirmation.=A0 The Merck Index provides some health and s
afety information.
John D.=A0Turner
--- On Tue, 8/16/11, ACTSNYC**At_Symbol_Here**CS.COM wrote:
From: ACTSNYC**At_Symbol_Here**CS.COM
Subject: [DCHAS-L] CAS #s for allotropes of phosphorus
To: DCHAS-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 the allotropes of ph
osphorus?
=A0
I'm working on the health effects for the chemicals listed in the next edit
ion of the Dictionary of Pyrotechnics--a freebie for a pal I work with on N
FPA 1126, the standard of pyro before a proximate audience.
My old Hawleys gives on CAS # 7723-14-0 to all forms and says elemental pho
sphorus can have allotropes that are "white (or yellow), red, and black."
=A0 Other references list a brown allotrope as well.=A0
Here's the deal. ACGIH has two entries in their big exposure guide booklet:
* White phosphorus CAS# 7723-14-0 which has no TLV, but a DFG MAK 0.05 mg/m
3.
* Yellow phosphorus 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 color.
Pyrotechs use white and red.=A0 And their suppliers as well as other expert
s list the White as CAS 7723-14-0 and Red as 12185-10-3.=A0 And if I google
various sources I can get different CAS numbers almost at will. They all c
ontradict each other.
Does anyone know if white and yellow are really different allotropes?=A0=A0
Does anyone know which CAS # goes with which?=A0=A0=A0 Specifically is the
CAS# 12185-10-3 for yellow or for red?=A0 It's to look like ACGIH might be
wrong on this one.
Thanks for thinking on this.
Monona
--0-1956968259-1313519573=:46438
Monona,
I read your E-mail inquiry regarding various allotropes of phosphorous
and immediately opened my Merck Index. According to the Merck, there
is only one CAS number for phosphorous [7723-14-0]. They do not prov
ide individual CAS numbers for the different allotropes. It also stat
es that there are three main allotropic forms: white, black and red.
White is sometimes refered to as yellow as a result of impurities, while re
d is sometimes refered to as violet. I also checked the 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>
Su
bject: [DCHAS-L] CAS #s for allotropes of phosphorus
To: DCHAS-L**At_Symbol_Here**LIST.UV
M.EDU
Date: Tuesday, August 16, 2011, 6:46 AM
Is anyone out there, or does anyone know, an
expert on the allotropes of phosphorus?
I'm working on the he
alth effects for the chemicals listed in the next edition of the Dictionary
of Pyrotechnics--a freebie for a pal I work with on NFPA 1126, the standar
d of pyro before a proximate audience.
My old Hawleys gives on CAS #
7723-14-0 to all forms and says elemental phosphorus can have allotropes t
hat are "white (or yellow), red, and black." Other references list a
brown 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 phosphor
us 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
color.
Pyrotechs use white and red. And their suppliers as we
ll as other experts list the White as CAS 7723-14-0 and Red as 12185-10-3.&
nbsp; 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 know w
hich CAS # goes with which? Specifically is the CAS# 1218
5-10-3 for yellow or for red? It's to look like ACGIH might be wrong
on this one.
Thanks for thinking on this.
Monona
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