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Atmospheric Mercury Concentrations and Isotopic Compositions Impacted by Typical Anthropogenic Mercury Emissions Sources
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-09-10 , DOI: 10.1021/acs.est.4c07649 Chuan Wang 1, 2 , Shaochen Yang 1 , Ruolan Li 1, 2 , Junyao Yan 1 , Yanxin Hu 1 , Chuyan Lai 1, 2 , Zhonggen Li 3 , Ping Li 1 , Leiming Zhang 4 , Xinbin Feng 1, 2
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-09-10 , DOI: 10.1021/acs.est.4c07649 Chuan Wang 1, 2 , Shaochen Yang 1 , Ruolan Li 1, 2 , Junyao Yan 1 , Yanxin Hu 1 , Chuyan Lai 1, 2 , Zhonggen Li 3 , Ping Li 1 , Leiming Zhang 4 , Xinbin Feng 1, 2
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Coal-fired power plants (CFPPs) and cement plants (CPs) are important anthropogenic mercury (Hg) emission sources. Mercury speciation profiles in flue gas are different among these sources, leading to significant variations in local atmospheric Hg deposition. To quantify the impacts of Hg emissions from CFPPs and CPs on local-scale atmospheric Hg deposition, this study determined concentrations and isotopes of ambient gaseous elemental mercury (GEM), particulate-bound mercury (PBM), and precipitation total Hg (THg) at multiple locations with different distances away from a CFPP and a CP. Higher concentrations of GEM and precipitation THg in the CFPP area in summer were caused by higher Hg emission from the CFPP, resulting from higher electricity demand. Higher concentrations of GEM, PBM, and precipitation THg in the CP area in winter compared to those in summer were related to the higher output of cement. Atmospheric Hg concentration peaked near the CFPP and CP and decreased with distance from the plants. Elevated GEM concentration in the CFPP area was due to flue gas Hg0 emissions, and high PBM and precipitation Hg concentrations in the CP area were attributed to divalent Hg emissions. It was estimated that Hg emissions from the CFPP contributed 58.3 ± 20.9 and 52.3 ± 25.9% to local GEM and PBM, respectively, and those from the CP contributed 47.0 ± 16.7 and 60.0 ± 25.9% to local GEM and PBM, respectively. This study demonstrates that speciated Hg from anthropogenic emissions posed distinct impacts on the local atmospheric Hg cycle, indicating that Hg speciation profiles from these sources should be considered for evaluating the effectiveness of emission reduction policies. This study also highlights the Hg isotope as a useful tool for monitoring environmental Hg emissions.
中文翻译：
典型人为汞排放源影响的大气汞浓度和同位素组成
燃煤电厂（CFPP）和水泥厂（CP）是重要的人为汞（Hg）排放源。这些来源中烟气中的汞形态分布各不相同，导致当地大气汞沉积存在显着变化。为了量化 CFPP 和 CP 排放的汞对局部大气汞沉降的影响，本研究测定了环境气态元素汞 (GEM)、颗粒结合汞 (PBM) 和降水总汞 (THg) 的浓度和同位素。距CFPP和CP不同距离的多个位置。夏季 CFPP 地区 GEM 和降水 THg 浓度较高，是由于电力需求增加导致 CFPP 汞排放量增加所致。 CP区冬季GEM、PBM和降水THg浓度高于夏季，与水泥产量较高有关。大气汞浓度在 CFPP 和 CP 附近达到峰值，并随着距植物距离的增加而降低。 CFPP 区域中 GEM 浓度升高是由于烟气 Hg 0排放，而 CP 区域中 PBM 和降水 Hg 浓度升高是由于二价 Hg 排放。据估计，CFPP 的汞排放量对当地 GEM 和 PBM 的贡献率分别为 58.3 ± 20.9 和 52.3 ± 25.9%，CP 的汞排放量对当地 GEM 和 PBM 的贡献率分别为 47.0 ± 16.7 和 60.0 ± 25.9%。这项研究表明，人为排放中的汞形态对当地大气汞循环产生了明显的影响，这表明在评估减排政策的有效性时应考虑这些来源的汞形态特征。 这项研究还强调汞同位素是监测环境汞排放的有用工具。
更新日期：2024-09-10
中文翻译：
典型人为汞排放源影响的大气汞浓度和同位素组成
燃煤电厂（CFPP）和水泥厂（CP）是重要的人为汞（Hg）排放源。这些来源中烟气中的汞形态分布各不相同，导致当地大气汞沉积存在显着变化。为了量化 CFPP 和 CP 排放的汞对局部大气汞沉降的影响，本研究测定了环境气态元素汞 (GEM)、颗粒结合汞 (PBM) 和降水总汞 (THg) 的浓度和同位素。距CFPP和CP不同距离的多个位置。夏季 CFPP 地区 GEM 和降水 THg 浓度较高，是由于电力需求增加导致 CFPP 汞排放量增加所致。 CP区冬季GEM、PBM和降水THg浓度高于夏季，与水泥产量较高有关。大气汞浓度在 CFPP 和 CP 附近达到峰值，并随着距植物距离的增加而降低。 CFPP 区域中 GEM 浓度升高是由于烟气 Hg 0排放，而 CP 区域中 PBM 和降水 Hg 浓度升高是由于二价 Hg 排放。据估计，CFPP 的汞排放量对当地 GEM 和 PBM 的贡献率分别为 58.3 ± 20.9 和 52.3 ± 25.9%，CP 的汞排放量对当地 GEM 和 PBM 的贡献率分别为 47.0 ± 16.7 和 60.0 ± 25.9%。这项研究表明，人为排放中的汞形态对当地大气汞循环产生了明显的影响，这表明在评估减排政策的有效性时应考虑这些来源的汞形态特征。 这项研究还强调汞同位素是监测环境汞排放的有用工具。
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