We’ve helped several washracks to improve their resource efficiency. If you do not want to neutralize in the field, I would suggest finding a local laboratory willing to neutralize as soon as they receive the sample. In such case, the sample would still be preserved in a shorter period of time than it would be if it sat in it were the early portion of a 24 hour composite sample.
Bruce Taylor, P.Eng
Phone: (519) 578-5100
Fax: (519) 669-5002
email@example.com [mailto:firstname.lastname@example.org] On Behalf Of Callahan, Mike
I'm working on a project to address the operating efficiency of a wash rack recycling system. The cleaning agent is alkaline and my client wants me to "fully" characterize the influent and effluent. Now here's my problem. The influent will be alkaline at 8 to 10 pH and contain 1 percent or so detergent. I want to send unpreserved samples to the lab but my client insists I follow USEPA protocol. For a total oil and grease sample, you preserve with HCl or H2SO4 to a pH < 2. My field tech doesn't look forward to having to handle acids in the field and I'm uncertain about possible chemical reactions with the cleaner. Has anyone else faced these issues?
Mike Callahan, PE
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