Methyl Derivatives Standard

2,3,7,8-Tetrachlorodibenzo-p-dioxin ,50 µg/mL,n-nonane,1mL,

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

beta-Endosulfan, 100 µg/ml, Ethyl acetate, 5ml