TITLE Multiple Metals Stack Emission Measurement Methodology for Stationary Sources, Current Status AUTHOR(S) Thomas E. Ward PERFORMING ORGANIZATION NAME AND ADDRESS EPA/ORD/AREAL/SMRB Research Triangle Park, NC 27711 SPONSORING AGENCY NAME AND ADDRESS EPA/ORD/AREAL/SMRB Research Triangle Park, NC 27711 ABSTRACT Stack emissions of metals from stationary sources are of present interest to the United State Environmental Protection Agency. (USEPA), to state and local governments, to industries, and to the public. When regulations require limitation of metals stack emissions, it follows logically that measurement methodology is necessary for determining compliance to the established limits. This presentation presents a broad overview of measurement methodology for the purpose of determining multiple metals stack emissions of up to sixteen metals using one sampling train developed by the Atmospheric Research and Exposure Assessment Laboratory of USEPA. Isokinetic sampling from a grid points produces a representative sample from which the multiple emissions of up to sixteen metals can be measured in the sample from one train. Metals in the stack particulate matter and in the gases are measured by inductively coupled plasma or atomic absorption spectroscopy. The sixteen metals are total Cr, Cd, As, Ni, Mn, Be, Cu, Zn, Pb, Se, P, T1, Ag, Sb, Ba, and Hg. Emission factor development, research requiring quantification of metals emissions and determining emission compliance are important potential applications of this methodology.