中国内地省级无意产生的五氯苯和六氯苯多源大气排放清单

Provincial atmospheric emission inventories for pentachlorobenzene(PeCBz)and hexachlorobenzene(HxCBz)from unintentional sources in the Chinese mainland

基于技术分类方法构建了动态排放因子数据库,再采用排放因子法,自下而上构建了1960~2019年中国内地省级无意产生的五氯苯和六氯苯的多源大气排放清单,并探究其时空分布特征.研究结果显示,五氯苯的最大排放源是含氯化学品生产,而六氯苯的最大排放源则是金属冶炼;五氯苯和六氯苯的排放密度均表现为东部地区高于西部地区的特征.从1960~2019年,五氯苯和六氯苯的排放量从1277.9,81.2kg分别上升至11862.3,439.7kg,但排放强度(单位GDP的排放量)却从869.3,55.2g/亿元分别下降至12.0,0.4g/亿元.

A dynamic emission factor database was constructed utilizing a technical split method.A bottom-up approach based on emission factor method was employed to establish a comprehensive atmospheric emission inventory of pentachlorobenzene(PeCBz)and hexachlorobenzene(HxCBz)from unintentional sources at the provincial level in the Chinese mainland for the years 1960 to 2019.The spatiotemporal distribution characteristics of these emissions were investigated.The results revealed that the primary source of PeCBz emissions was the production of chlorine-containing chemicals,while for HxCBz,it was the production of metals.The emission density for both PeCBz and HxCBz exhibited a pattern of higher values in the eastern regions compared to the western regions.Over the period from 1960 to 2019,the emissions of PeCBz and HxCBz increased from 1277.9 and 81.2kg,respectively,to 11862.3 and 439.7kg.However,the emission intensity(emissions per unit GDP)decreased from 869.3 and 55.2g per billion yuan to 12.0 and 0.4g per billion yuan for PeCBz and HxCBz,respectively.