U.S. EPA Method 29
Determination of Trace Metals Emissions in Exhaust Gases from
Stationary Source Combustion Processes.
antimony (Sb), arsenic (As), barium (Ba), beryllium (Be),
cadmium (Cd), chromium (Cr), cobalt (Co),
copper (Cu), lead (Pb), manganese (Mn), mercury (Hg), nickle
(Ni), phosphorous (P), selenium (Se), silver (Ag),
thallium (Tl), and zinc (Zn)