Deuterated Phthalate Internal Standard Di-n-butylphthalate-3,4,5,6-d4 2479,16 100 µg/mL Diethylphthalate-3,4,5,6-d4 2892,12 100 µg/mL Bis(2-ethylhexyl)phthalate-3,4,5,6-d4 2894,24 1000 µg/mL Solvent: n-Hexane U