Gas Metrology Group conducts research in gas metrology and classical analytical chemistry including: titrimetry, gravimetry, the thermodynamic basis for pH, wet chemical and electroanalytical methods. The group applies this research to the development and certification of Standard Reference Materials for primary chemical reagents and the determination of gaseous species and major elements in a broad spectrum of matrices; develops and critically evaluates new techniques and provides standards for real-time measurement of automotive emissions; establishes the infrastructure for the establishment of NIST traceability for secondary reference materials; maintains and develops pH and electrolytic conductivity standards and techniques; provides advice and services to government agencies, scientific organizations and American industry, and interacts with international standards organizations.