2,4-D 13C6, 100µg/ml in Acetone, 1ml

Nitroguanidine, 100 µg/ml, Acetonitrile, 1ml

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)

N,N-Dimethylformamide