Used primarily in analytical chemistry for calibration and quantitative analysis of mercury content in environmental, industrial, and biological samples. Commonly applied in techniques such as 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 within laboratories handling mercury-containing materials. Also used in research settings to study mercury behavior and develop detection methods.