西安市冬季采暖期雾霾天气下醛酮类化合物污染特征

为了解冬季采暖期雾霾天气下醛酮类化合物污染特征,利用2,4-二硝基苯肼(DNPH)/高效液相色谱(HPLC)方法,分别于2015年和2016年冬季采暖期对西安市大气中22种醛酮类化合物浓度进行了测定。结果表明,西安市冬季采暖期雾霾天气下醛酮类化合物在1.25～65.40μg/m^3波动,变化较大,其浓度水平与雾霾状态相关。主要的醛酮类化合物是甲醛、乙醛和丙酮,3者约占醛酮类化合物总质量的46%～93%。醛酮类化合物主要来源为机动车尾气,餐饮油烟也是不可忽视的一个来源。

Pollution characterizations of aldehydes and ketones in haze air during winter domestic heating season of Xi'an

In order to obtain aldehydes and ketones pollution characterizations during winter domestic heating season of Xi’an,concentrations of 22 aldehydes and ketones were measured by 2,4-dinitrophenylhydrazine(DNPH)/high performance liquid chromatography(HPLC)method for haze air in 2015 and 2016.The results showed that the concentrations of aldehydes and ketones in Xi’an ranged from 1.25μg/m^3 to 65.40μg/m^3,with a wide fluctuation,due to the difference of air haze state.The main aldehydes and ketones in the atmosphere during the winter domestic heating season of Xi’an were formaldehyde,acetaldehyde and acetone,which accounted for about 46%-93%of the total mass of aldehydes and ketones.The main source of atmospheric aldehydes and ketones was vehicle exhaust,and cooking fume was also a non-negligible source.