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Determination
of Inorganic Lead Emissions from Stationary Sources – USEPA
Method 12 USEPA Method 12 is used for the determination of inorganic lead emissions from stationary sources. Particulate and gaseous Pb emissions are withdrawn isokinetically from the source and are collected on a filter and in dilute nitric acid. The collected samples are digested in acid solution and are analyzed by atomic absorption spectrophotometry using an air/acetylene flame or inductively coupled argon plasma (ICP) AAS. Analysis for Pb by flame atomic absorption spectrophotometry is sensitive to the chemical composition and to the physical properties (e.g., viscosity, pH) of the sample. The analytical procedure requires the use of the Method of Standard Additions to check for these matrix effects, and requires sample analysis using the Method of Standard Additions if significant matrix effects are found to be present. High concentrations of copper interfere with the analysis of Pb at 217.0 nm. This interference can be avoided by analyzing the samples at 283.3 nm. |
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Last Update: October 25, 2006