Used in environmental testing laboratories to measure phosphate levels in water samples, helping monitor pollution and eutrophication in lakes, rivers, and wastewater. Commonly employed in spectrophotometric analysis to calibrate instruments for accurate quantification of orthophosphate concentrations. Essential in agricultural labs for assessing soil nutrient content and fertilizer efficiency. Also utilized in industrial water treatment to control scaling and corrosion by monitoring phosphate-based corrosion inhibitors in cooling systems.