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

1,1,1-Trichloro-2-[2-chloro(13C6)phenyl]-2-[4-chloro(13C6)phenyl]ethane, 1.2mL x 100ug/mL, nonane

Sulfur Calibration Mixtures: Di-n-butyl sulfide in Light White Oil (less than 20mg/kg S) Unit : 10mL screw-capped bottle Light White Mineral Oil Heavy White Mineral Oil (20 cSt at 40°C) (70 cSt at 40°C)

Special Acetates Mixture