Abstract
A new approach to determine the Chemical Oxygen Demand (COD) using a microwave digestion to replace the conventional time consuming reflux method is proposed. The procedure uses a microwave oven for the digestion of small volumes of sample (from 500 up to 2000 μ1), in a completely closed 60 ml Teflon vessel. For samples showing COD values up to 1000 mg O 2 1 −1, the digestion step is completed in 7 min, compared to the 2 h needed for the conventional reflux method. An average precision of 1.0% was obtained using membrane filtered natural samples.
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