Chlortoluron-d6 (N,N-dimethyl-d6), 100µg/ml in MeOH, 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)

Terbuthylazine-2-hydroxy, 100µg/ml in AL, 5ml

7-Hydroxy Methotrexate-d3 Ammonium Salt, 1mg