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2. Griess test - Wikipedia

   en.wikipedia.org/wiki/Griess_test

   The Griess test is an analytical chemistry test which detects the presence of nitrite ion in solution. One of its most important uses is the determination of nitrite in drinking water . The Griess diazotization reaction, on which the Griess reagent relies, was first described in 1858 by Peter Griess .

3. Colorimetric analysis - Wikipedia

   en.wikipedia.org/wiki/Colorimetric_analysis

   Colorimetric analysis is a method of determining the concentration of a chemical element or chemical compound in a solution with the aid of a color reagent.It is applicable to both organic compounds and inorganic compounds and may be used with or without an enzymatic stage.

4. Nitrite test - Wikipedia

   en.wikipedia.org/wiki/Nitrite_test

   A nitrite test is a standard component of a urinary test strip. A positive test for nitrites in the urine is called nitrituria. 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 ...

5. Colorimetry (chemical method) - Wikipedia

   en.wikipedia.org/wiki/Colorimetry_(chemical_method)

   Colorimetric assays use reagents that undergo a measurable color change in the presence of the analyte. They are widely used in biochemistry to test for the presence of enzymes, specific compounds, antibodies, hormones and many more analytes. For example, para-Nitrophenylphosphate is converted into a yellow product by alkaline phosphatase enzyme.

6. 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 .

7. Nitrate test - Wikipedia

   en.wikipedia.org/wiki/Nitrate_test

   In this test, a solution of diphenylamine and ammonium chloride in sulfuric acid is used. In the presence of nitrates, diphenylamine is oxidized, giving a blue coloration. This reaction has been used to test for organic nitrates as well, [7] and has found use in gunshot residue kits detecting nitroglycerine and nitrocellulose. [8]