Chromium (Cr), 1µg/ml in 2%-HNO3/Water, 4 x 25ml

Phenanthrene D10, 2000 ng/µl, 1ml

1,2-Dibromoethane

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