Cellulose paper with chemically immobilized 1-naphthylamine for the rapid determination of nitrites, nitrates, and aromatic amines

A method was proposed for the chemical immobilization of 1-naphthylamine on cellulose paper. Indicator paper was used for the test determination of nitrates, nitrites, anesthesine, novocaine, aniline, sulfadimesine, and 1-naphthylamine in liquid media. Three techniques for determining the analyte concentration were described: (1) by the length of the colored zone on a strip (3 x 80 min) of test paper sealed into a polymer film and contacting with the test solution by one end; (2) by the diameter of the colored elliptic zone on a paper strip (10 x 80 min) sealed into a polymer film and contacting with a test solution through a 0.3-0.5-mm perforation in the film; and (3) by the color intensity of indicator paper treated with 20 mL of a test solution using a test. The analytical ranges were 0.001-100 mg/L for nitrites, 0.05-1000 mg/L for nitrates and 0.5-1000 mg/L for aromatic amines; the relative standard deviation was no worse than 30%.