西安市采暖季与非采暖季环境空气中二噁英类物质浓度特征变化研究  

Study on the Concentration Variation of Dioxin in Ambient Air During Heating and Non-Heating Period in Xi’an

作　　者：白昭 王瑶 马文鹏 张会强 BAI Zhao;WANG Yao;MA Wen-peng;ZHANG Hui-qiang(Shaanxi Provincial Environmental Monitoring Center Station,Xi'an 710048,China;Shaanxi Provincial Academy of EnvironmentalScience,Xi'an 710048,China)

机构地区：[1]陕西省环境监测中心站,西安710048 [2]陕西省环境科学研究院,西安710048

出　　处：《四川环境》2023年第1期7-13,共7页Sichuan Environment

摘　　要：为研究西安环境空气中二噁英类物质的浓度变化特征,选择西安市采暖季和非采暖季开展持续22周监测工作,并使用高分辨气相色谱高分辨质谱法对样品进行分析研究。结果显示:该市采暖季和非采暖季二噁英浓度均低于国内其他城市;采暖季期间化石能源燃烧是二噁英毒性当量质量浓度升高的主要原因;17种二噁英同类物浓度在时间与空间上分布特征基本相同。在采暖季期间,二噁英主要存在于细颗粒物中;在非采暖季,低氯代二噁英及呋喃主要存在于气相中,高氯代二噁英及呋喃主要存在于颗粒物中。采暖季期间,可通过采用非化石能源燃烧和佩戴PM_(2.5)口罩减少二噁英对人体的危害。In order to study the variation characteristics of dioxin concentration in ambient air of Xi′an, heating and non-heating season were selected to carry out continuous monitoring work for 22 weeks. The samples were analyzed by HRGC/HRMS.The results showed that the concentration of dioxin in this city was lower than other cities in China in both heating period and non-heating period.The burning of fossil energy during heating period is the main reason for the increase of toxic equivalent mass concentration of dioxin. The measured mass concentrations and TEQ concentrations of 17 dioxin congeners were basically the same in time and space. During heating period, besides T4CDD/Fs, the other 15 dioxins mainly exist in fine particles. During non-heating period, the T4CDD/Fs, P5CDD/Fs and H6CDD/Fs exist in air, H7CDD/Fs and OCDD/F exist in particle. During the heating season, dioxins can be reduced by using non-fossil fuels and wearing PM_(2.5)masks.

关 键 词：采暖季 环境空气 二噁英 西安 

分 类 号：X831[环境科学与工程—环境工程]