EPA Method 500 Series Internal Std #4

1,8-Anthracenedicarboxylic acid, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 93655-34-6

Pendimethalin, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 40487-42-1

Sildenafil-d8 (piperazine-d8),neat,neat,10mg