EPA Method 551.1 Performance Check Soln

S421, 10 µg/ml, Ethyl acetate, 10ml

n-Perfluorooctanoic acid, ammonium salt, 50µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 3825-26-1

Extended Calibration/Low Level Solution ((CS1)/2) , 500ul, nonane