Abstract
Sulfur dioxide is a reduced compound which acts as a positive interference in the chemical oxygen demand (COD) analysis. Significant amounts of sulfur dioxide present in industrial waste samples may therefore result in erroneously high COD values, compared to that of a sample with only the organic portion of the waste. By adding 65 mg l −1 Mn 2+ to a secondary wastewater sample spiked with 500 mg l −1 sulfur dioxide, and oxygenating the sample for 6 min, sulfur dioxide was oxidized completely to sulfate. This oxidation procedure provides a statistically valid means of removing SO 2 interference in the COD analysis. The procedure provides an efficient means of investigating the organic COD of industrial effluents laden with SO 2 or its dissociation products.
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