English to Italian Tech/Engineering Environment & Ecology

Norma UNI CEN/TS 16660
Characterization of waste - Leaching behaviour test - Determination of the reducing character and the reducing capacity
(Caratterizzazione dei rifiuti - Prova di comportamento alla lisciviazione - Determinazione del carattere riducente e della capacità riducente)

A general cause for unstable values of the redox potential is the possibility of oxygen entering the system.
In addition, the participants pointed out that it was not easy to adjust the pH of the demineralized water exactly to the pH of the suspension, particularly in the neutral pH range.
This may also be one cause of the changing values and the difference between EH in the demineralized water and in the suspension.
The problem is overcome in the text of the standard by stating that in that case a titration of the water has to be carried out that bridges the relevant pH range, where in case of different pH values the EH is measured.