certified reference material, TraceCERT®, Manufactured by: Sigma-Aldrich Production GmbH, Switzerland
certified reference material, TraceCERT®, 100 μg/mL in acetonitrile (as aldehyde), ampule of 5 × 1 mL
certified reference material, TraceCERT®, 100 μg/mL in acetonitrile (as aldehyde), ampule of 1 mL