Natalie:

That unit is about what I expected. Over the years, the last rinse tank, cool or warm, rarely if ever, has metalwork ions in it. On occasion, we have found pH changes, usually associated with very odd-shaped pieces. The most common justification for having the last tank exhausted is "operator comfort"; that is, avoiding breathing the high-humidity air in the immediate vicinity of the tank. As the installations I have worked with were all on large, open manufacturing floors, we never considered humidity control as a factor, but Peter does have a point to consider if installed in a small room, such as a lab.

While personal exposure monitoring is needed, the easiest method to monitor potential for exposure is tank water analysis. This can be used to guide rinse water change frequency. It is essential for quality control. Monitoring the combined point of discharge to the local disposal system is often also needed to ensure compliance with local and federal discharge regulations.

I hope this helps. Continue to post interesting questions for both answers and to stimulate CHAS members.

Neal

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Stay healthy and prosper

NEAL LANGERMAN, Ph.D.

ADVANCED CHEMICAL SAFETY, Inc. (Retired)

5340 Caminito Cachorro

SAN DIEGO CA 92105

+1 (619) 990-4908

www.chemical-safety.com

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