2,3,4,4'-Tetrachlorobiphenyl (60)

1,2,3,4,6,7,8-Heptachloro[13C12]dibenzo-p-dioxin, 1.2ml x 50ug/ml, toluene

3-Methyl-2,2',4,4'-tetrachlorodiphenylmethane

EPA Method 525 Internals & Surrogates