IP 391-95 Calibration Level 4

delta-9-Tetrahydrocannabinolic acid A, 10.0 µg/ml,

Perfluoro-n-[1,2,3,4-13C4]octanoic acid, 50µg/ml in MeOH, 1,2ml

4-Nonylphenol diethoxylate, mixture of nonylisomers,100 µg/mL,isooctane,1mL,