EPA Method 500 Series Internal Standard #5

2,3,5,6-Tetramethylpyrazine, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-, Cas.no. 1124-11-4

Tantalum (Ta)

Oxamyl, 100 µg/ml, Acetonitrile, 5ml