Used primarily in analytical chemistry for the detection and quantification of nitrate ions in various samples, such as water, soil, and biological fluids. It is a key component in colorimetric assays, where it reacts with nitrate to produce a measurable color change, enabling precise analysis. This reagent is essential in environmental monitoring to assess water quality and detect contamination. It also finds application in agricultural research to evaluate soil nutrient levels and optimize fertilizer usage. Additionally, it is employed in clinical laboratories for diagnostic purposes, particularly in analyzing nitrate levels in bodily fluids.