Clofibrate,neat,neat,250mg,

4,4'-DDT 13C12, 100µg/mL in Acetone, 1ml

2,3,6,7-Tetrachloro(13C10)naphthalene, 1.2mL x 50ug/mL, nonane

Molybdenum, 1000µg/ml in in 0.5%-NH4OH / H2O,100ml