EPA Method 552 Internal Standard

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

Bis(2-ethylhexyl) phthalate-3,4,5,6-d4,1000 µg/mL,isooctane,1mL,

Ibuprofen, 250mg