EPA 1620 Standard 1

1,2,7,8-Tetrachloro[13C12]dibenzo-p-dioxin, 1.2ml x 50ug/ml, toluene

Oxadixyl, 100 µg/ml, Acetonitrile, 5ml

Sulfamethoxazole-d4 (benzene-d4),100 µg/mL,MeOH,1mL