Ofurace, 100 µg/ml, Acetonitrile, 1ml

Guaiacol, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 90-05-1

Methanol QC Reference Mixture III n-Butyl sulfide, 0.5 ppm (weight S by weight) in 99.9 % methanol; units: 1x10mL, 5x10mL

EPA Method 8240A Mix #2