Division 4.6 F1

Reference solution: the standard substances are dissolved in a 50 % vol. aqueous-alcoholic solution. The final concentrations in the reference solution should be of the order of:

furfural: 5 mg/l; 5-hydroxymethyl furfural: 10 mg/l; 5-methylfurfural 2 mg/l; vanillin: 5 mg/l; syringaldehyde: 10 mg/l; coniferaldehyde: 5 mg/l; sinapaldehyde: 5 mg/l; gallic acid: 10 mg/l; ellagic acid: 10 mg/l; vanillic acid: 5 mg/l; syringic acid: 5 mg/l; scopoletin: 0,5 mg/l.