EPA Method 8270C - B/N Matrix Spiking Solution

alphaßß (20S,24RS)-24-Ethylcholestane, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no.

Fenthion-oxon-sulfoxide, 100 µg/ml, Acetonitrile,

4-Methylphthalic acid, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 4316-23-8