EPA Method 500 Series Internal Std #4

Ethephon-hydroxy, 10mg

Tetrabenz[a,c,h,j]anthracene, neat, Solvent-neat, Unit 5mg, # of units-1, Cas.no. 215-11-2

N,N-Dimethylguanidine, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 6145-42-2