Fermentation Standard, in water, 1ml

Perfluoro-n-[1,2,3,4-13C4]heptanoic acid, 1.2ml x 50ug/ml, methanol

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

2,4-Dibromodibenzofuran, 1.2ml x 50ug/ml, toluene