Formaldehyde-DNPH Level 3 (1.0ug/mL)

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

Parathion-ethyl, 100 µg/ml, Ethyl acetate, 5ml

2,3,5,6-Tetrachloroterephthalic acid