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Monitoring of local pH and DO levels in the first 15 min upon immersion of (a) Fe in HBSS (b) Fe in HBSS+Ca (c) FeMn in HBSS (d) FeMn in HBSS+Ca (e) FeMnAg in HBSS and (f) FeMnAg in HBSS+Ca. The dashed line indicates the value at which the pH settles in each test.
