Michael Schock added comment "Not sure of the best way to handle Mn" to the document "42i128r2 et al - Manganese - JC Memo & Ballot.pdf" in the "Joint Committee on Drinking Water Treatment Units" group.
Subject: Not sure of the best way to handle Mn
Category: Substantive
Comment
One definitely negative comment is that I believe the Health Canda Mn health-effects standard is misquoted. however, I'm currently abstaining because I think there needs to be even more consideration of the unique difficulties Mn presents in setting performance standards for DWTUs, becuase the most dangerous aspects of Mn are through accumulation in plumbing systems that impact incorporation of other toxic metals in the pipe scales to be released as particuates, with Mn concentrations perhaps not as high as the pure health-based Mn ingestion threshold. It is not currently clear to me how to apportion Mn effects between NSF 53 and 42.
Proposal
No proposal provided.
Comment Number: #12292
Submitter: Michael Schock
Date submitted: 2024-01-31 22:38:11
Status: new
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Michael Schock Chemist
Chemist
Consultant - Public Health/Regulatory
Chemist
ms.waterchem@gmail.com---------------------------------