Used in analytical chemistry for calibration of instruments such as ion-selective electrodes and spectrophotometers to accurately measure iodide concentrations in samples. Commonly applied in environmental testing to determine iodide levels in water and soil. Essential in clinical laboratories for quantifying iodide in biological fluids like urine and blood, supporting thyroid function assessment and iodine deficiency studies. Also used in quality control processes within the pharmaceutical industry for iodine-containing drug formulations.