EPA Method 500 Series Internal Std #4

3,4-Dichloroaniline, neat, Solvent-neat, Unit 1ml, # of units-1, Cas.no. 95-76-1

5-tert-Butyl-2-methylphenol, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 5781-02-2

Salts in Crude Oil (Ca, Mg, Na)