Magnesium sulfate is added to remove any collected water.
The desorbed samples are analyzed by gas chromatography using a flame ionization detector. This method has been subjected to the established evaluation procedures of the Organic Methods Evaluation Branch. Warren Hendricks Organic Methods Evaluation Branch OSHA Analitical Laboratory Salt Lake City, Utah 2. Sampling Procedure 2.1. The two sections of charcoal are separated and retained with small plugs of foam and glass-wool.