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Re: Arsenic in Flexographic Printing



Fifteen or so years ago, I consulted with a cardboard box manufacturer who
brought me in to review a decision to install an expensive waste water
treatment system designed to remove RCRA metals from their waste water.  It
turned out that that was unnecessary since the source of the metals several
years earlier was the ink and the manufacturer was now making ink w/o the
metals.

My suggestion is that you attempt to id the source of the arsenic.  The
likely sources are the ink, the raw water supply, the glue(s), and the craft
paper stock.  Then work with the appropriate supplier to eliminate the
arsenic.

RC
Ralph E. Cooper, Ph.D.
Mediator, Attorney & Counselor at Law
9901 IH-10 West, Suite 800
San Antonio, TX 78230
210.558-0555
----- Original Message -----
From: "Tom Barron" <tsbarron@attglobal.net>
To: <p2tech@great-lakes.net>
Sent: Wednesday, February 13, 2002 10:25 AM
Subject: Arsenic in Flexographic Printing


> P2 Tech Members -
>
> Yesterday I visited a medium size flexographic printer that prints and
cuts
> out cardboard boxes.  The press was doing a run of pizza boxes at a rate
of
> about 10 per second - fascinating to watch.
>
> However, our focus during the visit was press washwater that is collected
in
> a nearby sump prior to disposal.  Samples of this washwater show an
arsenic
> concentration of 0.3 mg/l.
>
>     Has anyone seen similar arsenic levels?
>
>     What is the probable source of the arsenic - ink, cardboard, or
>     something else?
>
> Thanks in advance for your help.
>
> Tom Barron
> Civil Engineer
> 3351 Beechwood Drive
> Lafayette, CA 94549
> (925) 283-8121
>
>