EPA Method 500 Series Internal Std #4

2,2',3,4,4',5,5',6-Octachlorobiphenyl,100 µg/mL,isooctane,1mL,

Ethyl sulfate sodium salt,neat,neat,10mg,

3-Bromothiophene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 872-31-1