EPA Method 500 Series Internal Std #4

cis-Permethrin, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 61949-76-6

2,3-Naphthalenedicarboxylic acid, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 2169-87-1

Clopyralid methyl derivative