The Inorganic Chemical Metrology Group (ICMG) conducts research on the measurement science that underpins the identification and quantification of inorganic chemical species. The ICMG develops, critically evaluates and applies analytical methods based on electroanalytical, gravimetric, titrimetric, X-ray spectrometric, optical spectroscopic, and mass spectrometric techniques and investigates fundamental physical and chemical processes to develop new analytical techniques and to improve existing analytical methodology. The group is responsible for research and development activities in inorganic mass spectrometry, atomic emission spectrometry, X-ray fluorescence, electrochemistry, and classical methods of analysis, and maintains facilities and expertise for analysis at ultratrace concentrations. This research is applied to value assignment of NIST Standard Reference Materials®, NIST Reference Materials™ and other reference materials resources important to U.S. industry and other government agencies. Additionally, the ICMG provides advice and measurement services to other government agencies (federal, state, and local), scientific organizations, and U.S. industry and interacts with international standards organizations and National Metrology Institutes to establish comparability of measurement capabilities.