Parathion-ethyl, 100 µg/ml, Acetonitrile, 5ml

EPA Method 8310 Surrogate Standard

Perfluoro-n-[1,2,3,4-13C4]heptanoic acid, 1.2ml x 50ug/ml, methanol

1-(3,4-Dichlorophenyl)-3-methylurea, 10.0 µg/ml,