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This work had as objectives to identify and quantify trihalomethanes in water supply, water collected from the wellspring of Santa Maria da Vitoria, with the intention of simulating the steps of water treatment, including the step of pre-oxidation with chlorine and permanganate potassium. The determination of trihalomethanes and the total formation potential TAMs after the water treatment was performed using gas chromatography with headspace-trap with an electron capture detector. With the results obtained, it was possible to compare the formation of trihalomethanes conducted after treatment with both oxidants, showing the benefits of potassium permanganate in respect to chlorine and furthermore reinforcing the idea that potassium permanganate is a good option substitution.

Avaliação de trialometanos formados na etapa de pré- oxidação com cloro e permanganato de potássio em água de abastecimento