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

2,3,4,5-Tetrachloro-4'-methoxy[13C12]biphenyl, 1.2ml x 50ug/ml, toluene

Mercury (Hg)

Ethanol standard in water,1.1g/L,water, 1.5mL