Used in analytical laboratories for calibration of instruments such as atomic absorption spectrometers and ICP-MS to accurately measure lead concentrations in environmental, industrial, and biological samples. Commonly applied in water quality testing to detect lead contamination in drinking water, wastewater, and soil. Also used in quality control processes in industries like mining, battery manufacturing, and paint production to ensure compliance with safety and environmental regulations. Supports research in toxicology and public health studies focused on lead exposure and its effects.