Reporting sample results. : Positive coliform, positive E. coli, high nitrate, high nitrite, surface water residual or turbidity, chlorine dioxide or chlorite. We recommend having your laboratory submit results to us, but ultimately it's the water system's responsibility to ensure correct reporting. Once reported, the results are available in
Nitrate reduction test results following growth of Escherichia coli, Alcaligenesfaecalis, and Pseudomonas aeruginosa in nitrate broth. Escherichia coli reduces nitrate to nitrite, as evidenced by the red color after addition of nitrate reagents A (sulfanilic acid) and B (dimethyl-α-naphthylamine) to the culture.The agar plate nitrate reduction assay uses a similar principle of the culture broth (tube) nitrate reduction test but is performed directly on colonies on petri plates. A dilution series of test samples were surface plated on pre-poured M17 agar plates, allowed to dry (adsorb), and then overlaid with 10–12 mL nitrate agar (HiMedia) to entrap
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