In this paper we evaluate the technical feasibility of advanced oxidation process (AOX) using the reagent Fenton H2O2/Fe^(2+) in the treatment of wastewater generated by the caustic washing of an oil refinery. These waters contain a chemical oxygen demand (DQO), 20 160 mg / L and total phenols 1 800 mg / L. The results show the treatment efficiency of removal of 90% for DQO, and 99% for total phenol at pH 4.

En el presente trabajo, se evalúa la factibilidad técnica del proceso de oxidación avanzada (AOX) usando el reactivo Fenton H2O2/Fe^(2+) en el tratamiento de las aguas residuales generadas por el lavado cáustico de una refinería de petróleo. Estas aguas contienen una demanda química de oxígeno (DQO), de 20 160 mg/L y fenoles totales 1800 mg/L. Los resultados del tratamiento muestran eficiencia de remoción del 90% para DQO, y 99% para fenoles totales a pH de 4.

An alternative analytlcal method to the spectrophotometric method AOAC 982.01 has been developed to determine total boron in organic liquid fer1ilizers using emission spectrometry with nitrous oxide-acetylene flame in a wavelength of 249,7 nm. The method could apply to boron concentrations 0f 1,0 - 2,0 % w/w. The results showed 1% deviation to the official method.

An alternative analytlcal method to the spectrophotometric method AOAC 982.01 has been developed to determine total boron in organic liquid fer1ilizers using emission spectrometry with nitrous oxide-acetylene flame in a wavelength of 249,7 nm. The method could apply to boron concentrations 0f 1,0 - 2,0 % w/w. The results showed 1% deviation to the official method.

Residual commercial polystyrene samples (PScr) have been undergone to thermal decomposition processes between 433 hand 673 K (160 at 400 °C). The analyses of the distilled have confirmed that PS has been transformed into styrene with a yield from 45 to 60%. The monomer obtained has been polymerized in suspension using benzoyl peroxide like initiator and divinylbenzene (DVB) in proportions of 2, 6 and 10%. The obtained microspheres of copolymer (PS-DVB) have been sulfonated. After characterization, the results showed that 6% of DVB, presents similar characteristic than the commercial strongly acid cationic exchange resin Sybron Chemicals Inc. Ionac ® C-249.

Muestras de poliestireno comercial residual (PScr) se han sometido a procesos de descomposición térmica entre 433 a 673 K (160 a 400 °C). Los análisis del destilado han confirmado que el PS ha sido transformado a estireno con un rendimiento entre el 45 al 60%. El monómero obtenido se ha polimerizado en suspensión usando peróxido de benzoilo como iniciador y divinilbenceno (DVB) en proporciones de 2, 6 y 10%. Las microesferas obtenidas del copolímero (PS-DVB) han sido sulfonadas. El resultado, después de la caracterización, fue aquel del 6% de DVB presenta características similares a las de la resina comercial de intercambio catiónico fuertemente ácida Sybron Chemicals Inc. Ionac ® C-249.

lt has been determined the some vegetable from llo valley contains lead, cadmium and cooper. Key Words: Metllurgic plants, lead, cadmium, cooper.

lt has been determined the some vegetable from llo valley contains lead, cadmium and cooper. Key Words: Metllurgic plants, lead, cadmium, cooper.