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2.1 Prior to analysis, the solid or semi-solid samples must be prepared according to the procedures discussed in this method. 2.2 Method 7471, a cold-vapor atomic absorption method, is based on the absorption of radiation at the 253.7-nm wavelength by mercury vapor. The mercury is reduced to the elemental state and aerated from solution in a closed system. The mercury vapor passes through a cell positioned in the light path of an atomic absorption spectrophotometer. Absorbance (peak height) is measured as a function of mercury concentration. 2.3 The typical instrument detection limit (IDL) for this method is 0.0002 mg/L.
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