2,3,7,8-TetraCDD(13C12,99%).100ng/mL 1,2,3,6,7,8-HexaCDD (13C12,99%).250ng/mL2,3,7,8-TetraCDF (13C12,99%) . 100 ng/mL1,2,3,4,6,7,8-HeptaCDD (13C12,99%) . 250 ng/mL1,2,3,7,8-PentaCDD (13C12,99%) . 100 ng/mL1,2,3,4,6,7,8-HeptaCDF (13C12,99%) 250 ng/mL1,2,3,