L-(+)-Ascorbic acid, certified, 0.25g

2-Nitrophenol

N-Nitrosobis(2-hydroxylpropyl)amine, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 53609-64-6

Propoxycarbazone sodium, 100 μg/ml in MeOH, 1ml