Evaluation of ozone and water vapor interferences in the derivatization of atmospheric aldehydes with dansylhydrazine
The dansylhydrazine (DNSH) and 2,4-dinitrophenylhydrazine (DNPH) techniques for the determination of carbonyl compounds are both susceptible to interferences from ozone oxidation and water vapor hydrolysis. Here we report the results of an investigation of these potential interferences for a new DNSH microcatridge technique and describe means of minimizing or completely eliminating them. Studies were carried out using both silanized, controlled-pore, glass beads and octadecylsilane (C 18 ) particles as the reagent support. All intereferencea were minimized by the use of C 18 particles. Ozone was found to cause partial oxidation of the DNSH reagent but had no significant effect on the hydrazone products for mixing ratios up to 300 ppbv O 3 , with or without the presence of up to 100% relative humidity