Determination of formaldehyde using a kinetic-spectrophotometric method. Part II. Oxidation of N-methyl-substituted-1,4-phenylenediamines with hydrogen peroxide
- 1 January 1990
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 115 (8) , 1103-1107
- https://doi.org/10.1039/an9901501103
Abstract
A kinetic-spectrophotometric method is proposed for the determination of HCHO based on its “catalytic” property to oxidise N,N-dimethylphenylenediamine (DMPDA) by H2O2. The sensitivity at optimum conditions with this method is 1.3-fold greater than the corresponding oxidation of p-phenylenediamine (PDA). The condensation reaction step leading to the Bandrowski Base is much slower with DMPDA than with the PDA oxidation process. Other analytical parameters remain virtually unchanged and the detection limit lies in the range of a few p.p.m. However, the N,N,N′,N′-tetramethyl-1,4-phenylenediamine is not oxidised by H2O2 even in the presence of HCHO.Keywords
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