Acetochlor ESA sodium salt, 100ug/ml in MeOH, 1ml

4´-Hydroxydiclofenac, 10µg/ml in Acetonitrile, 5ml

Vitamin B12 (Cyanocobalamin), 100mg

Sulfur Calibration Mixtures: Di-n-butyl sulfide in Heavy 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)