WS pH @ 25°C

2,4,5-Trichloro-4'-methoxy[13C12]biphenyl, 1.2ml x 50ug/ml, toluene

Atropine,1000 µg/mL,acetonitrile,1mL

4.4'-DDE (13C12), 100µg/ml in n-Nonane, 1,2ml