certified reference material, 30 μg/mL in acetonitrile (as the aldehydes & ketones)), ampule of 1 × 1 mL Components: Acetaldehyde-2,4-dinitrophenylhydrazone; Acetone-2,4-dinitrophenylhydrazone; Acrolein-2,4-dinitrophenylhydrazone; Benzaldehyde-2,4-dinitrophenylhydrazone;...