Propriedades redox da matéria orgânica isolada de material ultrafiltrado das águas do rio Paraíba do Sul Redox properties of organic material present in ultrafiltrated water samples taken from the Paraíba do Sul river, Brazil
oleh: Marihus Altoé Baldotto, Luciano Pasqualoto Canellas, Ary Carlos Xavier Velloso, Raul Castro Carriello Rosa, Marcelo dos Santos Maciel, Carlos Eduardo Rezende, Maria Cristina Canela
| Format: | Article |
|---|---|
| Diterbitkan: | Sociedade Brasileira de Química 2009-01-01 |
Deskripsi
<abstract language="eng">Previous studies indicated that free radicals control organic matter redox activities. In the present study, organic matter of an ultra-filtrated material collected from seven samples taken seasonally from the Paraiba do Sul River for two years were titrated with an oxidizer (I2) in an inert atmosphere. Standard formal potential values for the electrode MO Ox, MO Red ranged from 0.754 to 0.786 V at a 25 ºC temperature. Organic matter oxidation capacity (COx) per carbon mass varied according to pH values, and changes in COx were related to rainfall and river flow intensities.