Effect of acidity on the s ampling and analysis of carbonyls using NDPH derivatization method

摘要

Determination of carobnyl compounds in ambinet air as well as in industrial stacks is receiving increased attention because of the critical role these compounds play in tropospheric organic chemistry including ozone formation and photochemical smog. Aldehydes and ketones are sampled using DNPH derivatization methods (EPA 0011, TO-11, and CARB 430) followed by HPLC/UV analysis. The chemistry associated with derivatization reaction is complex and may lead to ambiguous results which can be minimized by optimization of field and laboratory conditions. In this investigation the dampling and alalysis of carbonyls using EPA method 0011 is discussed in terms of the equlibrium chemistry and the stability of aldehydes and ketones under different acidic conditions.