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Date: Tue, 16 Aug 2011 09:35:23 -0500
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: "Long, Don" <Don.Long**At_Symbol_Here**URS.COM>
Subject: Re: CAS #s for allotropes of phosphorus
In-Reply-To: <22f05.18fb7250.3b7bceb5**At_Symbol_Here**cs.com>
Monona -
I work at the Pine Bluff Arsenal in Arkansas, and
as far as I
know, this is the only place that still makes/uses any kind of
phosphorus for
weapons (illum rounds, etc).
As I work with the Chemical Weapons destruction
part of the
Arsenal, not the production side of the house, I'm forwarding your email
to the
Industrial Hygienist on that side. She worked with us for many years
before
moving over there and I have hopes that she might be able to help a
little
bit.
I'd go ahead and send her email address to you,
but I lost it
and I'm waiting for one of my folks to send it to me so I can forward
your
email...confused yet?
Don A.
Long
CAIH, CEAS I
Southwest Research Institute
Laboratory
Pine Bluff Chemical Agent Disposal
Facility
PO Box 20130
White Hall, AR 71612
870-541-4930
Is anyone out there, or does
anyone know, an
expert on the allotropes of phosphorus?
I'm working on the
health
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 standard
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 that are
"white (or
yellow), red, and black." Other references list a brown allotrope
as
well.
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/m3.
* 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. And
their suppliers as well as other experts list the White as CAS 7723-14-0
and Red
as 12185-10-3. And if I google various sources I can get different
CAS
numbers almost at will. They all contradict each other.
Does
anyone know
if white and yellow are really different allotropes? Does
anyone
know which CAS # goes with which? Specifically is the
CAS#
12185-10-3 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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