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    Determination of Beryllium Emissions from Stationary Sources – USEPA Method 104

USEPA Method 104 is used for the determination of Beryllium (Be) emissions in ducts or stacks at stationary sources. 
 
Particulate and gaseous Be emissions are withdrawn isokinetically from the source and are collected on a glass fiber filter and in water.  The collected sample is digested in an acid solution and is analyzed by atomic absorption spectrophotometry (AAS).
 
Analysis for Be by flame atomic absorption spectrophotometry is sensitive to the chemical composition and to the physical properties (e.g., viscosity, pH) of the sample.  Aluminum and silicon in particular are known to interfere when present in appreciable quantities.  The analytical procedure includes (optionally) the use of the Method of Standard Additions to check for these matrix effects, and sample analysis using the Method of Standard Additions if significant matrix effects are found to be present.
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Last Update: October 25, 2006