pH measurement in the presence of organic

09 September 2015 1 905 Report

Is it reliable measure pH, with a pHmeter, in aqueous solution containing small organic molecules, such as formic acid or methanol? The presence of organic may cause some interference in the electrode of the pHmeter?

Alberto Vieira Borges

organic molecules are themselves involved in acid-base reactions so this is an interference on itself. In my field of work this is a major probelm, check out this paper:

Abril G., S. Bouillon, F. Darchambeau, C. R. Teodoru, T. R. Marwick, F. Tamooh, F. O. Omengo, N. Geeraert, L. Deirmendjian, P. Polsenaere & A.V. Borges (2015)Technical Note: Large overestimation of pCO2 calculated from pH and alkalinity in acidic, organic-rich freshwaters, Biogeosciences, 12(1):67-78

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