Metolachlor-d6 (propyl-d6),100 µg/mL,acetonitrile,1mL,

Perfluoro-n-[1,2-13C2]decanoic acid, 1.2ml x 50ug/ml, methanol

epsilon-HCH, 10μg/ml in Acetonitrile, 1ml

Sodium 1H,1H,2H,2H-perfluorooctane sulfonate (6:2), 50µg/ml in MeOH, 1,2ml