Used in analytical laboratories for the accurate determination of nitrite content in various samples such as water, food products, and biological fluids. Commonly applied in spectrophotometric and titration methods to ensure quality control and regulatory compliance. Essential for environmental monitoring to assess nitrite levels in drinking water and wastewater. Also utilized in food industry testing to monitor preservative levels in cured meats and prevent excessive nitrite addition. Provides reliable calibration for instruments requiring precise concentration standards.