Shariati-Rad, Masoud published the artcileQuantitation of trace amounts of nitrite in water samples using 4-amino-3-hydroxynaphthalene-1-sulfonic acid and central composite design, Recommanded Product: 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, the publication is Analytical Chemistry: An Indian Journal (2015), 15(10), 421-428, database is CAplus.
A simple, selective and very sensitive method for the spectrophotometric determination of nitrite in water has been developed and optimum reaction conditions along with other anal. parameters have been evaluated. Optimum conditions of the factors influencing the reaction were explored by central composite design (CCD). The variables chosen were pH of the acidic solution and volume of 4-amino-3-hydroxynaphthalene-1-sulfonic acid. The method is based on the reaction of nitrite with 4-amino-3-hydroxynaphthalene-1-sulfonic acid. The absorbance of the product at 303 nm obeyed Beer’s law in the concentration range of 0.001-0.200 mg L-1 of nitrite. A detection limit of 5 × 10-4 mg L-1 was obtained for the determination of nitrite by the proposed method. The method was successfully applied to determine nitrite in water sample. The RSD of the method for determination of nitrite in water samples was 6%. The method is capable in determination of trace amounts of nitrite in water samples.
Analytical Chemistry: An Indian Journal published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C7H16ClNO2, Recommanded Product: 4-Amino-3-hydroxynaphthalene-1-sulfonic acid.
Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem