Cations Std. Level 4

Mono-n-butyl phthalate (ring-1,2-13C2, dicarboxyl-13C2, 99%) 100 µg/mL in MTBE, 1,2ml

DL-alpha-Tocopherol, 1000 µg/ml, Methanol, 1ml

2,6-Diisopropylphenol-d18,1000 µg/mL,MeOH,1mL,