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Nitrate is the most completely oxidized form of nitrogen. It's formed during the final stages of biological decomposition-either in wastewater treatment or natural water supplies.

Using the colorimetric method, nitrate is reduced to nitrite using cadmium as the reducing agent. The resulting nitrite concentration is then determined colorimetrically (the intensity of the pink dye is directly proportional to the nitrite concentration of the sample).

An ampoule is immersed in the sample and the tip is snapped off. The correct volume of sample is drawn in and a small inert gas bubble forms. Sample and reagent are mixed by tilting the ampoule so the bubble travels from end to end. In two minutes or less, the resulting color is compared to the appropriate color standards (comparators or color chart) to quantify the result.

Approx. analysis time: 11 minutes. Range 0–50 and 50–360 ppm.

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