EPA Method 500 Series Internal Std #4

Phosphate (PO43-) as P

9-Fluorobenzo[k]fluoranthene, 10µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 113600-15-0

2,4-Dimethylthiophene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 638-00-6