Experimental Design for Performance Measurements of C1 to C4 Carbonyls Using DNPH-Coated Silica Gel and C-18 Cartridges

摘要

Carbonyl compounds are important constituents in urban and global atmospheres. In urban atmospheres these compounds frequently serve to initiate photochemical smog and certainly sustain the chain reactions leading to ozone formation. Measurement of carbonyl compounds under atmospheric conditions requires techniques that are both sensitive and free of interferences. For low molecular-weight aldehydes and ketones derivatization techniques with 2,4-dinitrophenylhydrazine (DNPH) have been used with some frequency in recent times. In the study, DNPH coated on two of the most popular substrates (silica gel and c(18)) have been examined for measuring C(1) to C(4) carbonyl components found in the atmosphere. The study is designed to evaluate the sensitivity, reproducibility, and effect of interferences, particularly ozone, on carbonyl measurements using these systems.