15N3-Atrazine, 100 µg/ml, Acetonitrile, 1ml

Furfural-3,4,5-d3 (stabilized with BHT),neat,neat,100mg

Sodium 1H,1H,2H,2H-perfluoro-1-[1,2-13C2]-octane sulfonate (6:2), 50µg/ml in MeOH, 1,2ml

Siloxanes - Mix 7, 10µg/ml in Acetone, 5ml