EPA Method 502/524 Fortification Solution

2,3-Diaminonaphthalene, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 771-97-1

2,3,5,6-Tetrachloroterephthalic acid

D3-(±)-Naproxen, 100 µg/ml, Methanol, 1ml