Size distribution and chemical characteristics of particles from crop residue open burning in North China  

作　　者：Tingkun Li Qili Dai Xiaohui Bi Jianhui Wu Yufen Zhang Yinchang Feng 

机构地区：[1]State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control,College of Environmental Science and Engineering,Nankai University,Tianjin,300350,China.

出　　处：《Journal of Environmental Sciences》2021年第11期66-76,共11页环境科学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2016YFC0208500);the Tianjin Science and Technology Program(No.18ZXSZSF00160);the Fundamental Research Funds for the Central Universities of China(Nos.ZB19500210,ZB19000804).

摘　　要：Crop residue open burning is an important emission source of ambient particles in China.This study analyzed the particle emission characteristics of crop residue open burning through combustion experiments with a novel open combustion simulation device using three typical crop straws in north China(corn,wheat,and rice).Particle samples size ranging from 0.006–9.890μm were collected by an Electrical Low Pressure Impactor plus,a high size-resolution instrument capable of dividing particles into 14 size stages.The size distributions of organic carbon(OC),elemental carbon(EC),water-soluble ions,and elements were analyzed,and source chemical profiles were constructed for PM0.1,PM1,PM2.5,and PM10.The number concentration of particles was concentrated in the Aiken nuclei mode(0.006–0.054μm),accounting for 75%of the total number,whereas the mass concentration was concentrated in the accumulation mode(0.054–0.949μm),accounting for 85.43%of the mass loading.OC,EC,Cl−,and K(include total K and water-soluble K)were the major chemical components of the particles,whose mass percentage distributions differed from those of other components.These fivemain components exhibited a bell-shaped size distribution in the 0.006–9.890μm range,whereas the other components exhibited a U-shaped distribution.Among the chemical profiles for PM0.1–PM10,OC was the most important component at 10–30%,followed by EC at 2%–8%.The proportions of K^(+),Cl^(−),and K varied substantially in different experimental groups,ranging from 0–15%,and K+and Cl−were significantly correlated(r=0.878,α=0.000).

关 键 词：Crop residue Open burning Size distribution Source profile Electrical Low Pressure Impactor plus(ELPI+) 

分 类 号：X51[环境科学与工程—环境工程] X71