EPA Method 500 Series Internal Std #4

Vitamin A-d5 acetate, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-5, Cas.no.

18ß(H)-Olean-12(13)-ene, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 471-68-1

(13C10)Kepone, 1.2mL x 100ug/mL, nonane