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acetaldehyde-2,4-DNPHglycolaldehyde-2,4-DNPH Back to: DNPH Reference Materials formaldehyde-2,4-DNPH Product Code: 33082 formaldehyde-2,4-DNPH, 100µg/mL, acetonitrile, 1mL/ampul Price £47.50 Description *Concentration calculated as the aldehyde/ketone.