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RE: Farewell and coolant-related machine shop question
Brass will leach lead into water, its a problem that has been known for a
long time. There was major concern here in California under Prop 65 because
the initial water coming out of a brass faucet will have very high lead
levels. With freshly cut brass, the problem will be greatest because the
lead at the metal surface hasn't had time to leach out.
You could try raising the pH of the first rinse to reduce leaching but I'm
just guessing if it would help. The EDF might have data on lead leaching
versus the pH of water. They were the ones to sponser the research into the
brass faucet problem. As an alternative, the shop could look into their
brass supply. High lead levels indicate the use of recycled scrap that has
not been sorted for lead content (the lead is due to solder).
Best wishes on your new position.
> From: Vincent R. Perelli[SMTP:email@example.com]
> Reply To: Vincent R. Perelli
> Sent: Wednesday, February 17, 1999 9:12 AM
> To: firstname.lastname@example.org
> Subject: Farewell and coolant-related machine shop question
> Hi Folks,
> It is with some sadness that I post my last question to P2 Tech, (at the
> request of my Supervisor), as I am leaving the NH Pollution Prevention
> Program to take the Senior Planner position in the Commissioner's Office.
> After a great run of 10 years, I am leaving a program that I helped to
> from scratch (along with Paul Lockwood) out of the early days of
> Hazardous Waste Capacity Assurance (anyone remember working on
> I've enjoyed working directly with many of you on, and off, this
> I have also enjoyed some of the "electronic" relationships I've
> with a bunch of you. I have been nothing but impressed with the caliber
> and depth of knowledge and experience of folks on this listserve (and in
> the Technical Assistance Community).
> On to bigger and not necessarily better things. We'll see....
> requests, P2 conference planning, on-site assessments, and outreach
> literature are soon to be replaced with Strategic Planning, Performance
> Partnership Agreements, State of the Environment Report, and a bunch
> of workgroups, committees, and partnerships.
> Finally --- the question --
> A machine company is sawing brass parts. Following the cutting
> operation, the parts pass through two rinse tanks. The first rinse is
> picking up lead and exceeding the 5 ppm limit for hazardous waste
> determination. Since the rinse is tap water (I told him to check pH), the
> culprit appears to be the cutting fluid ("Valcool VNT 800" from Cincinnati
> Milicron). They can't change the brass formulation but could change the
> coolant. The owner says the longer the parts sit in the rinse water, the
> higher the lead level. Has anyone heard of a similar problem? Does
> anyone know of a good, non-aggressive coolant? Are there other
> possible sources of the lead?
> Thanks everyone. Keep up the great work that you all do. I'm going to
> make sure that I maintain the P2 ethic in my new position. Please keep in
> touch and I'll find opportunities for the same.
> Vincent Perelli
> NH Department of Environmental Services
> Pollution Prevention Program
> 6 Hazen Drive
> Concord, NH 03301
> 603 271-2902
> 603 271-2456