Used as a reference standard in environmental testing laboratories to calibrate instruments and validate analytical methods for the determination of nitrite nitrogen in water samples. Ensures accuracy and reliability in monitoring nitrite levels in drinking water, wastewater, and surface water. Supports compliance with regulatory standards by providing a known concentration for quality control and proficiency testing. Essential in preventing false readings that could lead to health risks, as elevated nitrite levels can cause methemoglobinemia, especially in infants. Also used in research studies assessing nitrogen cycle dynamics and pollution sources in aquatic systems.