Caffeine for system suitability, 10mg

2-Methoxypyrazine, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-, Cas.no. 3149-28-8

1,2,3,4,7,8,9-Heptachlorodibenzofuran, 1.2ml x 50ug/ml, nonane

Isazofos, 10.0 µg/ml, Ethyl acetate, 10ml