Boletín de la Sociedad Chilena de Química
versión impresa ISSN 0366-1644
MARIN GALVIN, RAFAEL; RODRIGUEZ MELLADO, JOSÉ MIGUEL; RUIZ MONTOYA, MERCEDES y JIMENEZ GAMERO, CARMEN. "OXIDATION-REDUCTION POTENTIAL (ORP) IN PREPARED AND INDUSTRIALLY TREATED WATERS". Bol. Soc. Chil. Quím. [online]. 2001, vol.46, n.4, pp. 387-397. ISSN 0366-1644. http://dx.doi.org/10.4067/S0366-16442001000400002.
A linear relationship between oxygen contents (as log %O2) and EH values for synthetically prepared waters has been obtained. Highly oxygenated waters showed values around EH=-0.040V and rH=13.0, while poorly oxygenated waters showed values around EH=-0.145V and rH=12.2. Such values were independent of the salinity. The presence of two active redox pairs typically encountered in natural waters such as "Fe3+/Fe2+" and "Mnn+/Mn2+" also contributed to the EH and rH values by increasing the ranges of variation with respect to those obtained in their absence. In industrial drinking water production, dosage of O3 or Cl2 to raw water could serve to sterilise this water by increasing the EH and rH values in 0.210V and 21.8 units, respectively. In industrial biological treatment of wastewaters, very important reductions in the COD and NH3 concentrations were associated to differences (0.300-0.400V in all cases from one water to another) in EH in aerated water with respect to the EH in the influent non-treated wastewater
Palabras clave : Drinking water; Redox potential; Synthetic waters; Wastewaters; Treated waters.