唐军婷, 宋党育, 李云波,等.光照对大气细颗粒物中汞形态分布的影响[J].河南理工大学学报（自然科学版）,2023,42(4):86-91.

TANG J T, SONG D Y, LI Y B,et al.Effect of illumination on mercury speciation in PM_2.5 [J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(4):86-91.

光照对大气细颗粒物中汞形态分布的影响

唐军婷1, 宋党育1,2, 李云波1,2, 汤顺林1

1.河南理工大学 资源环境学院，河南 焦作  454000;2.河南理工大学 中原经济区煤层（页岩）气河南省协同创新中心，河南 焦作  454000

摘要:为探究颗粒态汞的光还原及可能的二次释放结果，以细颗粒物（PM_2.5）为载体，采用Bloom法和冷原子荧光法，在不同光照时长下，收集、测定细颗粒物中汞（PBM_2.5）质量和形态分布。结果表明：模拟太阳光照射下PBM_2.5发生的化学反应以光还原反应为主，产生的气态汞中90%以上为Hg⁰，少量为Hg²⁺；光照促进PBM_2.5向Hg⁰转化；光照时间增加，F5/PBM_2.5增加（F5为硫化物态汞），其余形态汞质量主要以指数形式降低；光照促进大气PBM_2.5以更稳定的形态存在，正向影响汞沉降。

关键词:汞;PM;化学形态;光还原

doi:10.16186/j.cnki.1673-9787.2021050042

基金项目:国家自然科学基金资助项目（41272173，41602175）

收稿日期:2021/05/11

修回日期:2021/08/08

出版日期:2023/07/25

Effect of illumination on mercury speciation in PM_2.5

TANG Junting1, SONG Dangyu1,2, LI Yunbo1,2, TANG Shunlin1

1.Institute of Resources and Environment， Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.Henan Cooperative Innovation Center of Coalbed Methane （Shale） in Central Plains Economic Zone，Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract:In order to reflect the photo-reduction and possible secondary release of particle-bound mercury，the distribution variations of PM_2.5 bound mercury（PBM_2.5）under simulated sunlight were analyzed by using PM_2.5  as the carrier，which provided a reference for the study of PBM_2.5 speciation transformation and regional mercury pollution assessment.Mercury speciation in PM_2.5  was extracted and determined by Bloom and CVAFS respectively.The gaseous mercury produced by PBM_2.5 under different light duration was also collected and determined simultaneously.The results showed that under simulated sunlight，photo-reduction was the mainly chemical reaction of PBM_2.5.More than 90% of the produced gaseous mercury was Hg⁰，and a small amount was Hg²⁺.The transformation of PBM_2.5 to Hg⁰ was mainly affected by illumination，which promoted the transformation.With the increase of illumination time，the volume concentrations of each mercury speciation in PM_2.5 decreased exponentially.F5/ PBM_2.5 increased with the progress of illumination，while other mercury speciation showed the opposite trend，indicating that illumination could promote the existence of particle-bound mercury in a more stable geochemical form and positively affect the deposition of mercury.

Key words:mercury;PM;chemical speciation;photo-reduction

光照对大气细颗粒物中汞形态分布的影响_唐军婷.pdf