Sulfadiazine, 100 µg/ml, Methanol, 1ml

2,3,3',4,5,5'-Hexachloro[13C12]biphenyl, 1.2ml x 50ug/ml, nonane

(13C9)Endosulfan Sulfate, 100µg/ml in Nonane, 1,2ml

2-(2-Methoxyethoxy)ethanol