The Stabilization of Small Concentrations of Formaldehyde in A queous Solutions

Abstract

Based on the Hantzsch-reaction, a stabilization (fixation) of small concentrations of formaldehyde in aqueous solutions (<0.4μg CH₂0/ml) can be performed, allowing a storage of these solutions for 1 week at room temperature, in darkness. Using the fluorescent nature of 3,5-diacetyl-1,4-dihydrolutidine (λ_ex = 410 nm, λ_em = 510 nm), formed as a result of the Hantzsch-reaction, CH₂0-concentrations down to 0.02 μ/ml can be determined fluorimetrically up to 7 days after preparation (sampling).