Interference Standard 1

alpha alpha alpha (20R,23R,24S)-4 alpha,23,24-Trimethylcholestane, neat, Solvent-neat, Unit ca. 5µg, # of units-1, Cas.no. 146276-33-7

EPA 527Mix 1, Pesticides A 10 Analytes, each 500µg/mL in Methanol; unit: 1x1mL 2768.8 Atrazine [1912-24-9] 3324.9 Bromacil [314-40-9] 3100.19 Esbiol (S-bioalletrin) [28434-00-6] 3394.25 Esfenvalerate [66230-04-4] 3405.25 Fenvalerate [51630-58-1] 34

D8-N-Nitrosobis(2-hydroxyethyl)amine, 10mg