Used in analytical chemistry for calibration and quantification of mercury in environmental, industrial, and biological samples. Commonly applied in techniques like atomic absorption spectroscopy (AAS) and inductively coupled plasma mass spectrometry (ICP-MS) to ensure accurate measurement of mercury levels. Essential for monitoring pollution in water, soil, and air, as well as in quality control for pharmaceuticals and food safety testing. Also used in research settings to study mercury behavior and develop detection methods.