EPA Method 515 Herbicide Acids

1,2,3,8,9-Pentachlorodibenzo-p-dioxin,50 µg/mL,n-nonane,1mL,

1-Ethyl-2-pyrrolidinone, 1000µg/ml in MeOH, 1ml

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