Theophylline, 100µg/ml in MeOH, 5ml

3,3',5,5'-Tetrabromobisphenol A diacetate,50 µg/mL,toluene,1mL Certan,

PAH-Mix 9, 100 ng/µl, 10ml

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