Fenthion-oxon, 100 µg/ml, Cyclohexane, 1ml

4-Ethylphenol, 100 µg/ml, Acetonitrile, 1ml

N-Nitrosoethylmethylamine, 100 µg/ml, Methanol,

Extraction Standard Solution, in nonane/6.8% toluene, 1,2ml