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WFI Test Requirements: USP vs. EP

Why are Heavy Metals and Nitrates still required for Purified Water (and
WFI) in the EP.  Didn't TOC and Conductivity replace these Wet Chemical tests?
Heavy Metals and Nitrates are not required for Purified Water and WFI in
USP!  Therefore, in order to claim that WFI meets USP and EP requirements,
does one need to perform Heavy Metals and Nitrates, in addition to TOC,
Conductivity, Bioburden and Endotoxin?

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Beth
Beth_Ann_Brescia@biogen.com
Biogen

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