2,3,5,6-Tetrabromo-p-xylene, 1.2ml x 50ug/ml , toluene

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

Ethanol standard in water,1.5g/L,water, 3mL

1-Chloro-1,1-difluoroethane, 1000µg/ml in MeOH, 1ml