Custom Internal Standard Mix

Fenthion-sulfoxide, 10.0 µg/ml, Acetonitrile, 10

n-Hexadecane, 1000µg/mL in methylene chloride, 1ml

2,2',3,3',4',5,5'-Heptachloro-4-biphenylol, 1.2ml x 50ug/ml, nonane