Dear all,
interesting number about the origin of lead leaching, indeed. Although
not too significant, i fear.
A little remark on landfill leaching:
Of course there are real-life leachate values for lead, i could mention
thousands if i had any... ;-)
The "problem" is, that the concentrations are generally really small. At
the moment i have only one example at hand (and i did not read the
entire report yet...):
At the household waste landfill Herten (Germany), the Pb concentration
in the leachate is 0,1 mg/l, groundwater upstream is 0,01, groundwater
downstream is 0,05. So the Groundwater is obviously affected.
I really try to see some kind of usefulness for "leadfree" to make my
work a bit more motivating.
(for this example see
http://www.xfaweb.baden-wuerttemberg.de/alfaweb/print/herten.pdf,
unfortunately in german)
Additional remark: I still think that colloid-based transport of
precipitated contaminants in soil and ground water is worth a study. I
also wonder if that effects the test results of leachates/groundwater.
Additional remark about the critisized leaching tests: I repeat that
acetic acid as a leaching agent is IMHO reasonable for "modelling"
landfill leachates, although precipitation reactions are not modelled
with that. As usual, real-life natural processes are so complex, that it
is hardly possible to calculate them exactly (and they differ, for
example from landfill to landfill). An exact model (or test method)
would have to be as complex as reality itself, and there is obviously
not enough knowledge to re-build reality completely.
Best regards,
khz
-----Ursprüngliche Nachricht-----
Von: Leadfree [mailto:[log in to unmask]] Im Auftrag von Pascal Guiheneuf
Gesendet: Dienstag, 4. Mai 2004 18:29
An: [log in to unmask]
Betreff: Re: [LF] amount of lead comsumed
Numbers I've got are for year 2002 :
Pb : 2,800,000,000 Kg
Lead in electronics : 14,150,000 Kg
Pareto is :
Storage batteries : 80,81%
Oxides (paint, glass, ceramic, chemicals): 4,78%
Ammunition, shot and bullets : 4,69%
Sheet lead : 1,79%
Cable covering : 1,14%
Casting material : 1,13%
Brass & Bronze : 0,72%
Pipes, traps, other extrusions : 0,72%
Solder (non-electronic) : 0,7%
Solder in electronics & CRTs : 0,49%
Miscellaneous : 2,77%
Another number I've got, gives 30% of the Pb leachages in landfills are
due
to the 0,5% of Pb in electronics.
Pascal Guihéneuf
UMTS HW Life Cycle Team Leader
Environmentally-Friendly Core Team Leader
ESN 574-5382 or 33.1.69.55.53.82 (phone)
ESN 754-2704 or 33.6.64.04.27.04 (mobile)
-----Original Message-----
From: santhakumar rajesnayagham [mailto:[log in to unmask]]
Sent: lundi 3 mai 2004 18:15
To: [log in to unmask]
Subject: [LF] amount of lead comsumed
Hi All,
We all know that electronic solder consumes only 0.49% of the total lead
consumption. Looks like a very low value, but is there a number (in Kg
or
pounds) which gives the total amount of 'lead' this 0.49% consumes? I
guess
it will be a big enough number to console that moving to lead-free is
reasonable. I would greatly appreciate if an authentic source is
available.
Thank you Sincerely Santhakumar
Santhakumar Rajesnayagham
Graduate Student & Research Assistant
Center for Electronics Manufacturing and Assembly (CEMA) Rochester
Institute
of Technology, Rochester, New York Phone : (CEMA Lab) 585-475-7293
---------------------------------
Do you Yahoo!?
------------------------------------------------------------------------
----
---Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d To
unsubscribe, send a message to [log in to unmask] with following text in
the
BODY (NOT the subject field): SIGNOFF Leadfree To temporarily stop
delivery
of Leadree for vacation breaks send: SET Leadfree NOMAIL Search previous
postings at: http://listserv.ipc.org/archives Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information,
or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
------------------------------------------------------------------------
----
---
Win a $20,000 Career Makeover at Yahoo! HotJobs
------------------------------------------------------------------------
-------Leadfee Mail List provided as a service by IPC using LISTSERV
1.8d
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop delivery of Leadree for vacation breaks send: SET
Leadfree NOMAIL
Search previous postings at: http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
------------------------------------------------------------------------
-------
-------------------------------------------------------------------------------Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL
Search previous postings at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-------------------------------------------------------------------------------
|
