Identification Tests Nitrite

The United States Pharmacopoeia describes the following two identification tests for procaine [31]. In one, the infrared absorption spectra of standard and sample in KBr pellets are compared, and require to exhibit maxima only at the same frequencies. In another test, 10 mg of drug is dissolved in 1 mL of water, to which is added 1 drop each of hydrochloric acid and 1 10 sodium nitrite solution. One then adds 1 mL of a solution prepared by dissolving 0.2 g of 2-naphthol in 10 mL of 1 10 sodium hydroxide solution, shakes, and obtains a scarlet-red precipitate as a positive reaction. 

In the Franchimont test [42], nitramines are reduced to nitrite ions by zinc and acetic acid and then subjected to the Griess reaction. A modification of this test was used for the identification of nitramine impurities in RDX [43]. 

Identification of the microorganisms found in both the process water and on the metal surface. Tests for nitrite-utilizing bacteria or sulfur oxidizers are more complex. (Stott)5... 

Identification Al 10 aqueous solution is alkaline to litmus and gives positive tests for Potassium and for Nitrite, Appendix IIIA. 

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