Piperonyl butoxide, 100 µg/ml, Ethyl acetate, 5m

Sodium 1H,1H,2H,2H-perfluoro(1,2-13C2)dodecanesulfonate (10:2), 50µg/ml in MeOH, 1,2ml

1,2,3,7,8,9-Hexachloro[13C12]dibenzofuran, 1.2ml x 50ug/ml, toluene

Toxaphene Parlar-No. 26, 1µg/mL in Cyclohexane, 1ml