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  2. Nitrate test - Wikipedia

    en.wikipedia.org/wiki/Nitrate_test

    Nitrate Test by using Brown Ring Test. A common nitrate test, known as the brown ring test [2] can be performed by adding iron(II) sulfate to a solution of a nitrate, then slowly adding concentrated sulfuric acid such that the acid forms a layer below the aqueous solution. A brown ring will form at the junction of the two layers, indicating the ...

  3. Nitrite test - Wikipedia

    en.wikipedia.org/wiki/Nitrite_test

    This test is commonly used in diagnosing urinary tract infections (UTIs). A positive nitrite test indicates that the cause of the UTI is a Gram-negative organism, most commonly Escherichia coli. The reason for nitrites' existence in the presence of a UTI is due to a bacterial conversion of endogenous nitrates to nitrites. This may be a sign of ...

  4. Griess test - Wikipedia

    en.wikipedia.org/wiki/Griess_test

    The test was used in forensics for many years to test for the traces of nitroglycerine. Caustic soda is used to break down sample containing nitroglycerine to produce nitrite ions. The test involves the taking of a sample with ether and its division into two bowls. Caustic soda is added to the first bowl followed by the Griess reagent; if the ...

  5. Nitrate reductase test - Wikipedia

    en.wikipedia.org/wiki/Nitrate_reductase_test

    Add two nitrate tablets to the sample. If the bacterium produces nitrate reductase, the broth will turn a deep red within 5 minutes at this step. If no color change is observed, then the result is inconclusive. Add a small amount of zinc to the broth. If the solution remains colorless, then both nitrate reductase and nitrite reductase are ...

  6. Phenotypic testing of mycobacteria - Wikipedia

    en.wikipedia.org/wiki/Phenotypic_testing_of_Myco...

    Nitrate reduction. Mycobacteria containing nitroreductase catalyze the reduction from nitrate to nitrite. The presence of nitrite in the test medium is detected by addition of sulfanilamide and n-naphthylethylendiamine. If nitrate is present, red diazonium dye is formed. [1] Photoreactivity of mycobacteria;

  7. Urine test strip - Wikipedia

    en.wikipedia.org/wiki/Urine_test_strip

    The test for nitrites is a rapid screening method for possible asymptomatic infections caused by nitrate-reducing bacteria. Some of the gram negative bacteria species that most commonly cause urinary tract infections ( Escherichia coli , Enterobacter , Klebsiella , Citrobacter and Proteus ) have enzymes that reduce the nitrate present in urine ...

  8. N-(1-Naphthyl)ethylenediamine - Wikipedia

    en.wikipedia.org/wiki/N-(1-Naphthyl)ethylenediamine

    N-(1-Naphthyl)ethylenediamine dihydrochloride is widely used in the quantitative analysis of nitrate and nitrite in water samples by colorimetry. It readily undergoes a diazonium coupling reaction in the presence of nitrite to give a strongly colored azo compound .

  9. AutoAnalyzer - Wikipedia

    en.wikipedia.org/wiki/AutoAnalyzer

    Standardized methods have been published by the ASTM (ASTM International), the US Environmental Protection Agency (EPA) as well as the International Organization for Standardization (ISO) for environmental analytes such as nitrite, nitrate, ammonia, cyanide, and phenol. Autoanalyzers are also commonly used in soil testing laboratories ...