光照对大气细颗粒物中汞形态分布的影响  

Effect of illumination on mercury speciation in PM_(2.5)

作　　者：唐军婷 宋党育[1,2] 李云波 汤顺林 TANG Junting;SONG Dangyu;LI Yunbo;TANG Shunin(Institute of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Henan Cooperative Innovation Center of Coalbed Methane(Shale)in Central Plains Economic Zone,Henan Polytechnic University,Jiaozuo 454000,Henan,China)

机构地区：[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

出　　处：《河南理工大学学报（自然科学版）》2023年第4期86-91,共6页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(41272173,41602175)。

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Hg^(2+);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。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 re-gional 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 Hg^(2+).The transformation of PBM_(2.5) to Hg0 was mainly affected by illumination,which pro-moted 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.

关 键 词：汞 PM_(2.5) 化学形态 光还原 

分 类 号：P595[天文地球—地球化学]