香烟自由燃烧产生的PM_(2.5) 及其碳组分谱特征

PM_(2.5)and carbon components generated from cigarettes burning in smoldering method

通过对箱体实验仓内PM_(2.5)的采集、称重与PM_(2.5)中碳组分的分析,研究香烟自由燃烧过程PM_(2.5)的一次排放和燃烧结束后仓内PM_(2.5)的二次生成。结果表明:单支某品牌香烟自由燃烧时PM_(2.5)一次排放量为1200μg,排放速率为3μg·s^(-1),1 h内30 m^(3)空间室内连续9支香烟自由燃烧,PM_(2.5)质量浓度最大可增加360μg·m^(-3)。香烟自由燃烧直接排放的PM_(2.5)中碳组分的分布特征:碳组分占PM_(2.5)的比重为57.7%,高于环境空气PM_(2.5)中碳组分比重;OC_(1)、OC_(2)、OC_(3)是香烟自由燃烧过程一次排放PM_(2.5)中碳组分的优势组分,ρ(OC_(1))/ρ(TC)为34.6%,ρ(OC_(2))/ρ(TC)为23.9%,ρ(OC_(3))/ρ(TC)为17.8%;香烟自由燃烧排放PM_(2.5)中ρ(OC)/ρ(EC)的特征值为14.8,ρ(Char)/ρ(Soot)的特征值为1.2。香烟自由燃烧结束后仓内PM_(2.5)及碳组分的分布反映香烟自由燃烧烟气对于PM_(2.5)的二次生成有一定的贡献。

PM_(2.5)samples in experimental chamber were collected and weighted during cigarettes burning in smoldering method and after the burning.The carbon components in PM_(2.5)were determined.Primary emission of PM_(2.5)in the process of cigarettes burning in smoldering method and secondary generation of PM_(2.5)after cigarette burning were studied.The results showed that 1200μg PM_(2.5)was directly emitted during the combustion of a single ordinary brand cigarette,with the emission rate of 3μg·s^(-1).In a 30 m^(3)space within 1 hour,indoor PM_(2.5)mass concentration could increase by a maximum of 360μg·m^(-3)when 9 cigarettes burned in smoldering method in the room.The distribution characteristics of carbon components in PM_(2.5)directly emitted by cigarettes burning in smoldering method was as follows.The proportion of carbon components in PM_(2.5)from cigarettes burning in smoldering method was 57.7%,which was higher than that of ambient PM_(2.5).OC_(1),OC_(2),and OC_(3)were the dominant components of carbon components in PM_(2.5)from cigarettes burning in smoldering method.The ratio ofρ(OC_(1)),ρ(OC_(2))andρ(OC_(3))toρ(TC)was 34.6%,23.9%,and 17.8%,respectively.The characteristic value ofρ(OC)/ρ(EC)in PM_(2.5)from cigarettes burning in smoldering method was 14.8,and the characteristic value ofρ(Char)/ρ(Soot)was 1.2.It was considered that the smoke from cigarettes burning in smoldering method had a certain contribution to the secondary generation of PM_(2.5)by analyzing the PM_(2.5)and carbon components in PM_(2.5)collected after the burning of cigarette.