ISO 15009 Stock Internal Standard Solution for Volatile Halogenated Hydrocarbons 3 Analytes, each 2000µg/mL in methanol; unit: 1x5mL 3932.4 1,4-Dichlorobutane [110-56-5] 2048.7 alpha, alpha, alpha-Trifluorotoluene [98-08-8] 3933.6 2-Bromofluor