Sulfanilic acid azochromotrop is primarily used as a reagent in analytical chemistry for the detection and quantification of specific metal ions. It is particularly effective in colorimetric assays, where it forms colored complexes with metals, enabling their identification and measurement. This chemical is often employed in environmental testing to monitor water quality, detecting trace amounts of heavy metals like lead, cadmium, and mercury. Additionally, it finds use in biochemical research for studying metal-binding proteins and enzymes. Its ability to produce distinct color changes makes it a valuable tool in laboratory analyses, ensuring accurate and sensitive results in various scientific applications.