-----Original Message-----
From: James Houck
[mailto:houck@omni-test.com]
Sent: Wednesday,
September 06, 2006 11:12 AM
To: Wu, Chun Yi
Subject: RE: Trace metal emissions
from residential wood combustion
We did not include metals because their
emission factors from virgin wood is very very low. Most emission factors
for metals that have been compiled are really based on detection limits not
acutal values. Among the transition and heavy metals zinc is
the only exception and it is not very toxic. Sometimes real chromium
numbers are reported but I beleive that is a function of how much dirt is
on the wood as chromium is a common crustal element. Among the common PAH
compounds we reported only naphthalene and benzo(a)pyrene because
naphthalene usually represents well over one half of the total 16-PAH mass
emitted from RWC and benzo(a)pyrene is a widely recognized mutagenic and
carcogenic compound with a lot of history.
-----Original Message-----
From: Wu, Chun Yi
[mailto:Chun.Yi.Wu@state.mn.us]
Sent: Wednesday,
August 30, 2006 2:08 PM
To: houck@omni-test.com
Subject: Trace metal emissions
from residential wood combustion
Hi, Dr. Houck,
It was very nice talking
with you today. I looked at emission factors that you gathered and
compared them with NEI emission factors. I noticed that you didn’t
list emission factors for all individual PAHs (only three of them) but groups
such as 7-PAH and 16-PAH. Also, I didn’t find emission factors for
trace metals which are emitted from electric generating, industrial,
commercial/institutional boilers when they are fueled by wood. Do you
have emission factor information for individual PHAs and trace metals?
Chun Yi Wu, Ph.D., P.E.
Environmental Analysis & Outcomes Division
Minnesota Pollution Control Agency
520 Lafayette Road N.
St. Paul,
55155-4194
Phone: (651)282-5855
Fax: (651)297-7709
E-mail: chun.yi.wu@state.mn.us