- Propionaldehyde 2,4-Dinitrophenylhydrazone standard solution,1000μg/mL in (Methanol:Acetonitrile=95:5), 1ml
- Propionaldehyde 2,4-Dinitrophenylhydrazone standard solution,1000μg/mL in (Methanol:Acetonitrile=80:20), 1ml