EPA Method 515.3 - Underivatized acids

Dimefuron, 10.0 µg/ml, Acetonitrile, 10ml

4-Chlorophenol-2,3,5,6-d4, OD,1000 µg/mL,isopropanol,1mL,

4-Ethylcatechol, 100 µg/ml, Methanol, 10ml