EPA Method 515.1 - Performance Check Solution

Isocaffeine (1,3,9-Trimethylxanthine), neat, Solvent-neat, Unit 25mg, # of units-1, Cas.no. 519-32-4

3,4-Dimethylphenol, 100 µg/ml, Methanol, 5ml

Ethoprop, 1000µg/ml in MeOH, 1ml