Flumetralin, 100 µg/ml, Ethyl acetate, 5ml

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)

N-Nitroso-N-methylaniline, 100μg/ml in MeOH, 5ml

Ammonium (NH4+)