Ethephon, 100 µg/ml, Acetonitrile, 5ml

2,5-Dichloro[13C12]biphenyl, 1.2ml x 50ug/ml, nonane

Trichloroacetic acid (TCA), 100µg/ml in MTBE, 5ml

1,1-Difluoroethylene, 1000µg/ml in MeOH, 1ml