▎ 摘　　要

NOVELTY - A nitrite ions concentration in a solution detecting method involves polymerizing a carboxylated graphene with a pyrrole to form a carboxyl group graphene-polypyrrole, dissolving the carboxylated graphene-polypyrrole into chitosan solution. The carboxylated graphene-polypyrrole-chitosan mixed solution is obtained by ultrasonic treatment, titrated to a glassy carbon electrode and dried to obtain a carboxylated graphene/polypyrrole/chitosan modified electrode. The modified electrode is utilized as working electrode, followed by measuring nitrite ion by differential pulse voltammetry curve. USE - Method for detecting nitrite ions concentration in a solution. ADVANTAGE - The method enables detecting nitrite ions concentration with fast detection and high sensitivity. DETAILED DESCRIPTION - A nitrite ions concentration in a solution detecting method involves polymerizing a carboxylated graphene having a mass/volume ratio of 0.8-1.2 mg: 4 mL with a pyrrole to form a carboxyl group graphene-polypyrrole, dissolving the carboxylated graphene-polypyrrole into 0.5 wt.% chitosan solution at a mass ratio of 3-5 mg: 1 mL. The carboxylated graphene-polypyrrole-chitosan mixed solution is obtained by ultrasonic treatment, titrated to a glassy carbon electrode and dried to obtain a carboxylated graphene/polypyrrole/chitosan modified electrode. The modified electrode is utilized as working electrode, followed by measuring nitrite ion by differential pulse voltammetry curve.