Heptachlor, 1000µg/ml in Hexane, 1ml

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)

Benzo(g,h,i)perylene, 1000µg/ml in MeChl, 1ml

2-Chloro-6-nitrotoluene, 250mg