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I’ve been doing some acidity measurements recently (following the APHA 2310 method, including the hot peroxide pre-treatment). Then, I tried to compare my measured values with the total calculated acidity values (using the usual equation, taking into account dissolved amounts of Fe2+, Fe3+, Al, Cu, Ni, Zn, Mn and pH) and surprisingly my measured values are higher than my calculated values. I know that these two values don’t necessarily match very precisely, but usually the calculated acidity (which corresponds to the total potential acidity) should be higher than the measured acidity…
Any thoughts?