N-2,4-Dimethylphenyl-N'-methylformamidine HCl, 10.

Iohexol, 100µg/ml in MeOH, 1ml

Pentaphene, neat, Solvent-neat, Unit 5mg, # of units-1, Cas.no. 222-93-5

EPA Method 537 Native Primary Std (br/l mix), 2µg/ml in MeOH, 1,2ml