EPA 524.2 Fortification Solution has been used as an internal standard to identify and quantify volatile organic compound (VOC) species of benzene, toluene, ethyltoluene, and xylene (BTEX), bromodichloromethane (BDCM), and THMs, respectively, in river water, tap water samples as well as air and water of indoor swimming pools, by gas chromatography (GC) based techniques. EPA 524.2 Fortification Solution may be used as a CRM to quantify volatile organic compound (VOC) analytes in indoor and outdoor air samples by GC coupled to mass spectrometry (MS).', 'Refer to the productμs Certificate of Analysis for more information on a suitable instrument technique. Contact Technical Service for further support.