Trace Metals Method 0012

The metals sampling train is used to determine the total chromium, cadmium, arsenic, nickel, manganese, beryllium, copper, zinc, lead, selenium, phosphorous, thallium, silver, antimony, barium, and mercury in incinerator stack emissions. The stack gas is withdrawn isokinetically from the source with the particulate emissions collected in a probe and on heated filters and the gaseous emissions collected in a series of chilled impingers. These impingers contain a solution of dilute nitric acid combined with hydrogen peroxide in two impingers and an acidic potassium permanganate solution in two impingers. Analyzing the metals in particulates involves using either inductive coupled argon plasma (ICAP) spectroscopy or a graphite furnace atomic adsorption (GFAA) spectrometer.

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