... inthis chapter, instructional laboratories must have, at a minimum, the followinganalytical instruments: GC-FID, GC-ECD, HPLC-UV, FlAA and GFAA, IC, and aUV-vis spectrophotometer (stand-alone). ... 40 -mLvial. A 2- L aliquot of the extract is injected into a C-GC-FID to determine BTEX.The C-GC-FID must be previously optimized to separate most BTEX compounds.In a separate experiment, 40 ... 40 mL of chlorine-disinfected drinking water is placed ina sealed HS vial and heated, and 0.5 cc of the headspace is sampled and injecteddirectly into a C-GC-ECD. The C-GC-ECD must be previously...