DTPA will be fine. Its not an all or nothing thing where at 7.6 the chelator is all gone (separated). 7.5 for dtpa is just where it begins to happen. Around 8 you might lose 30-40%. But its not 8 all the time, for much of the day its down in the 7s. Pic shows the general idea. Frankly I wouldnt worry about it
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