EPA Method 531.1 - Performance Check Solution

n-Pentyl 4-hydroxybenzoate, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 6521-29-5

Phorate-oxon-sulfoxide, 100µg/ml in Acetonitrile, 1ml

2,4,4',6-Tetrachlorobiphenyl ,100 µg/mL,isooctane,1mL,