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

2,4,6-Tribromophenol, Internal Standard Stock Solution Cat No 2060.6 1.148mg/mL, in ethanol, 5mL

1H-1,2,4-Triazole, 100μg/ml in Acetonitrile, 5ml

Caffeine, 1000µg/ml in MeOH, 1ml