简介: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 radia简介: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.详细>