HEI report, "Characterization of Metals Emitted from Motor Vehicles"

["Dennis McGeen" <mcgeendd@michigan.gov>]

FYI, I've posted the HEI report, "Characterization of Metals Emitted
from Motor Vehicles," at the Wiki site, on the page for manganese.  


http://glos.us/wiki/x/74BQ


This is a follow up to discussion on the August 29th call concerning
Michigan's evaluation of manganese levels in the downriver Detroit
area.
 The correspondence below, between Margaret Sadoff of our Toxicology
Unit, and Marion Hoyer of U.S. EPA's Ann Arbor office, mentions the
report
by Health Effects Institute (HEI) on metals from brake wear.  It
appears that EPA's ORD has some related research underway that is not
yet available for release, but it is very close to the HEI study on
the
fraction of PM10 and PM25 from brake wear that is manganese (page 35,
Table 7 of the HEI report).

>From Maggie and Marion's correspondence it first appeared that there
may be some differences
between HEI and EPA in estimates of what proportion of metals from
brake
wear is manganese.  However, this is not the case.  Maggie meant to say
in her email that the HEI report showed that 50-70%
of all manganese emissions from autos are from brake wear, not that
50-70% of brake wear emissions are comprised of Mn.  

I've not reviewed the HEI report myself, but staff on Michigan's
manganese workgroup may apply the information from the report to
arrive
at an estimate of the contributions onroad mobile sources make to the
elevated manganese levels in AQD air sampling in the Detroit area.

Dennis



>>> Margaret Sadoff 04/17/07 12:32 PM >>>


>>> <Hoyer.Marion@epamail.epa.gov> 03/20/07 3:40 PM >>>

Hi Maggie, 

I'm so glad this was of some help.  I left you a vmail about the MMT
use. 
I should also note, in case you are not aware, that brake wear metals
are not yet in the NEI so NATA does not reflect these.  NATA typically
underestimates metals on the whole too and when focusing on an area
like
Detroit it gets pretty uncertain......  and most definitely does not
capture high end exposures. 

I'll keep in touch.  Thanks for your note. 

Marion 



Margaret Sadoff <sadoffm@michigan.gov> 
Sent by: Margaret Sadoff <sadoffm@michigan.gov> 
Received Date: 
03/20/2007 03:16 PM 
Transmission Date: 
03/20/2007 03:16:33 PM To
Marion Hoyer/AA/USEPA/US@EPA cc
Subject
Re: Fw: Mobile Source Monitoring Data in Detroit




This is exactly the type of information I was looking for.  I am not
in
the office today but I can get you the Mn data from Detroit and the
HEI
study on Wednesday.  There is a regional initiative in EPA Region 5
that
is also looking at Mn based on the findings of our Detroit Air Toxics
Initiative Report (online at www.michigan.gov/deqair, then go to the
Air
Toxics homepage and the link to the DATI reports).  I forget who the
lead person is but I will send that along to you as well.  They are
focusing on the steel mills and autos and as far as I'm aware, have
not
evaluated the potential contribution from mobile sources.  Given the
high traffice density in this area and given the proposed additional
six
lanes of traffic at the Ambassador bridge, I'm starting to wonder if
mobile emissions are making a bigger contribution to the high soil and
ambient Mn at the Dearborn, River Rouge and Delray monitors.

Thanks again Marion.

Maggie

Margaret M Sadoff, MPH
MI Dept. of Environmental Quality
Air Quality Division/Toxics Unit
Constitution Hall, 3 North
525 West Allegan St
PO Box 30260
Lansing, MI  48909-7760
(517) 373-7046
SADOFFM@michigan.gov 
>>> <Hoyer.Marion@epamail.epa.gov> 03/20/07 2:18 PM >>>
Hi Maggie,

I was not aware that Mn levels are so high in Region 5.  If you have
mean, 
min and max values for the four Detroit monitors, I am interested in 
knowing. 

I've emailed our fuel registration person in DC to find out if there
is

potentially any MMT in gasoline being used in Region 5.   I'll let you

know what I hear.

The metal emission rates from brake wear reported by Schauer in the 
attached report are the best I know of right now.  Schauer is
reporting

emission rates for brake wear metals measured on a dynamometer and
also

metals in brake housing dust. For the former (emission rates on the
dyno) 
they are reporting brake wear emission rates of Mn (in PM10) that are 
right around 1 ug/km (see Figure 20 on page 30).  For brake housing
dust

Schauer is reporting 1.0 - 1.7 mg Mn /g of PM10  (Table 7 on page 35)
-

these mass fractions are very close to values we measured recently in
ORD 
for brake wear but the EPA data aren't ready for publication or use in

inventory modeling yet. 


In your original email below, you mentioned that an HEI report
indicated

that approximately 50-75% of metals emitted from brake wear is
comprised

of manganese.  I have not seen this information - if you could send it
I

am very interested.  In Schaur's study, Fe and Ba far outweigh the Mn 
found in brake dust.  There are a few other metals (notably Zn and Cu)

that are found in mass fractions equal to or higher than Mn. 

I have some studies from other countries that report Mn for various 
metrics of traffic but I don't think they will be highly relevant.

As part of the Pb NAAQS risk assessment there are modeling efforts to 
estimate the contribution of Pb in near roadway soil on ambient 
concentrations.  I could get you in touch with the people doing this 
modeling if you think it would be any help (i.e., transferring the
methods 
to Mn).

I will keep my eyes out for more.  I've asked a couple of people here
and 
in ORD and not gotten responses from them but if they do I'll forward
to

you.

Marion






Margaret Sadoff <sadoffm@michigan.gov>
Sent by: Margaret Sadoff <sadoffm@michigan.gov>
Received Date:
03/12/2007 02:36 PM
Transmission Date:
03/12/2007 02:36:58 PM

To
Marion Hoyer/AA/USEPA/US@EPA
cc

Subject
Re: Fw: Mobile Source Monitoring Data in Detroit






Hi Marion,

Thanks for getting back to me.  Our workgroup is trying to put
together
a 
manganese emissions inventory within the next month or so.  As you may

already know, Region 5 has had particularly high ambient air (and
soil)

manganese levels (above the RfC) and we are taking the first step to 
address the problem in Southeast Michigan - mainly Detroit.  So the
short 
answer is, the sooner the better but I certainly understand what it's
like 
to juggle multiple priorities!

I'm pulling out some data from the 2002 NEI but if you could point me 
toward any other good sources of data or reports for mobile sources,
I'd

really appreciate it.  Even if we could come up with a relative
percent
of 
manganese emissions from brake wear, fuel additives, trains, planes,
etc. 
that would be helpful.  The NATA 99 indicates that mobile sources of 
manganese contribute less than 1% to exposure and risk (for Wayne
County
I 
think) but I wonder if this is also true of a major transportion hub
like 
Detroit.

Thank you.

Maggie

Margaret M Sadoff, MPH
MI Dept. of Environmental Quality
Air Quality Division/Toxics Unit
Constitution Hall, 3 North
525 West Allegan St
PO Box 30260
Lansing, MI  48909-7760
(517) 373-7046
SADOFFM@michigan.gov 

>>> <Hoyer.Marion@epamail.epa.gov> 03/12/07 2:21 PM >>>

Hello Maggie, 
I do have some thoughts on this and some digging I would like to do
before 
responding to you fully.   It is going to take me a little while to do

this as I'm a bit swamped with mercury and lead at the moment.... 
what
is 
your timeline for needing information? 

Marion 
734-214-4513 


----- Forwarded by Marion Hoyer/AA/USEPA/US on 03/12/2007 02:16 PM
-----

Kathryn Sargeant/AA/USEPA/US
EPA-OAR,OTAQ,ASD 
Received Date: 
03/05/2007 01:23 PM 
Transmission Date: 
03/05/2007 01:23:10 PM 


To
"Margaret Sadoff" <sadoffm@michigan.gov> 
cc
"Marion Hoyer" <hoyer.marion@epa.gov> 
Subject
Re: Mobile Source Monitoring Data in DetroitLink








Hi Maggie.  It's good to hear from you.  I looked for you at the
workshop 
in RTP this Dec. but didn't see you...maybe next time.

I'm referring this to Marion Hoyer...Marion, do you have any thoughts?


----- Original Message -----
From: Margaret Sadoff [sadoffm@michigan.gov] 
Sent: 03/05/2007 01:12 PM
To: Kathryn Sargeant
Subject: Mobile Source Monitoring Data in Detroit 

Hi Kathryn, 

You may not remember me.  I met you at the EPA Air Toxics Conference
in

Raleigh/Durham in the spring of 2005.  The Air Quality Division of the

MDEQ is currently working on a manganese emissions inventory for the 
various sources in the Detroit area as part of an overall manganese 
reduction strategy.  A recent HEI report indicated that approximately 
50-75% of metals emitted from brake wear is comprised of manganese.  I
was 
wondering if you have any data on manganese emissions from mobile
sources 
in the city of Detroit that you could share with us.  We are trying to
get 
a handle on what percentage of manganese concentrations monitored at 4
of 
our Detroit monitors can be attibuted to mobile sources.  There is
also
a 
separate group here evaluating how soil concentrations of manganese
may
be 
affecting the monitors and having mobile source information would be 
helpful toward that effort as well. 

Thank you for your assistance.  Call with questions. 

Maggie 

Margaret M Sadoff, MPH
MI Dept. of Environmental Quality
Air Quality Division/Toxics Unit
Constitution Hall, 3 North
525 West Allegan St
PO Box 30260
Lansing, MI  48909-7760
(517) 373-7046
SADOFFM@michigan.gov 




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