BTEX Mixture 5 5 Analytes, each 100µg/mL in methanol; unit: 1x5mL screw-cap Chiron No. Compound CAS No. 1300.6 Benzene [71-43-2] 1264.7 Toluene [108-88-3] 1268.8 Ethylbenzene [100-41-4] 1266.8