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(T/EH104) Determination of chemical oxygen demand in urban waste water based on domestic microwave sample digestion. Gomez, Ignacio1, Iborra, Roberto2, Perez, Ana3, Santacruz, Ana Maria4, Navarro Balsalobre, Juan 3, Mataix, Jorge4, 1 2 3 4 ABSTRACT- This work is presented as a continuation of a previous one (Determination of Chemical Oxygen Demand based on Domestic Microwave Sample Digestion, Gomez et al., 1999) where optimum time and power were studied in order to determinate the chemical oxygen demand in standard solutions prepared from potassium hydrogenphthalate using a domestic microwave oven. A gradual digestion in domestic microwave has been now compared with the digestion in stove at 150 celsius degree during 2 hours. The method was applied to urban waste water coming from different towns of Alicante which organic load is variable due to the contribution of different industrial sources. Samples were digested in a stove, according to the traditional method, as well as in domestic microwave oven applying different times and powers between 100 and 300 Watts. The method was checked to be more effective if microwave digestion was carried out working with different and gradually higher powers than working with a high fixed one. The analytical method that we propose is appropiated for samples of varied sources, such as urban and industrial waste water, or whorl with high contaminant load. Key words: COD, Microwave, Waste Water |
