Resumo

MARIN GALVIN, RAFAEL; RODRIGUEZ MELLADO, JOSÉ MIGUEL; RUIZ MONTOYA, MERCEDES  e  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 E_H values for synthetically prepared waters has been obtained. Highly oxygenated waters showed values around E_H=-0.040V and rH=13.0, while poorly oxygenated waters showed values around E_H=-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 E_H 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 E_H 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 E_H in aerated water with respect to the E_H in the influent non-treated wastewater

Palavras-chave : Drinking water; Redox potential; Synthetic waters; Wastewaters; Treated waters.