4-Ethylphenol, 500mg

Perfluoro-n-[1,2,3,4,5,6,7-13C7]undecanoic acid, 1.2ml x 50ug/ml, methanol

Sulfatroxazole, 50mg

EPA Method 533 Native Primary Std (br/l mix), 500ng/ml in MeOH, 1,2ml