Observations of the chemistry and concentrations of reactive Hg at locations with different ambient air chemistry
Observations of the chemistry and concentrations of reactive Hg at locations with different ambient air chemistry
复制标题
在不同环境空气化学成分的地点观察活性汞的化学成分和浓度
DOI：
10.1016/j.scitotenv.2023.166184
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发表时间：
2023
影响因子：
9.8
通讯作者：
Dommergue, Aurélien
中科院分区：
文献类型：
--
作者：
Gustin, Mae Sexauer;Dunham-Cheatham, Sarrah M.;Allen, Natalie;Choma, Nicole;Johnson, William;Lopez, Sam;Russell, Armistead;Mei, Eric;Magand, Olivier;Dommergue, Aurélien
汞研究界需要更准确地测量大气汞浓度和化学性质的方法。活性汞活性系统（RMAS）使用阳离子交换、尼龙和PTFE膜来测定活性汞（RM）、气态氧化汞和颗粒结合汞（PBM）的浓度和化学性质。格鲁吉亚亚特兰大（NRGT）的新数据表明，颗粒结合汞占主导地位，化学成分主要是N和S汞化合物。在犹他州的大盐湖（GSL），RM主要是PBM，N双键>有机物>卤素> O Hg II化合物。在得克萨斯州瓜达拉哈拉山国家公园（GUMO），卤代化合物浓度最低时，与该网站的空气相互作用主要来自中西部，最高时，空气来自墨西哥。在阿姆斯特丹岛，南印度洋，化合物主要是卤化与一些N，S和有机HgII化合物可能与生物活性。应用GEOS-Chem模型，看它是否预测了五个实地点的测量结果。模型值高于GSL的观测值，略低于NRGT，观测值比GUMO和内华达州里诺的模型值高一个数量级。在一般情况下，从13个地点收集的数据表明，N，S和有机RM化合物与城市和森林的位置，卤代化合物来源于海洋边界层，和O化合物与远程传输。目前和过去开发的数据表明，建模者必须考虑多种形式的RM，而PBM是RM的重要组成部分。
The Hg research community needs methods to more accurately measure atmospheric Hg concentrations and chemistry. The Reactive Mercury Active System (RMAS) uses cation exchange, nylon, and PTFE membranes to determine reactive mercury (RM), gaseous oxidized mercury, and particulate-bound mercury (PBM) concentrations and chemistry. New data for Atlanta, Georgia (NRGT) demonstrated that particulate-bound Hg was dominant and the chemistry was primarily N and S HgIIcompounds. At Great Salt Lake, Utah (GSL), RM was predominately PBM, with Ndouble bondS > organics > halogen > O HgIIcompounds. At Guadalupe Mountains National Park, Texas (GUMO), halogenated compound concentrations were lowest when air interacting with the site was primarily derived from the Midwest, and highest when the air was sourced from Mexico. At Amsterdam Island, Southern Indian Ocean, compounds were primarily halogenated with some N, S, and organic HgIIcompounds potentially associated with biological activity. The GEOS-Chem model was applied to see if it predicted measurements at five field sites. Model values were higher than observations at GSL, slightly lower at NRGT, and observations were an order of magnitude higher than modeled values for GUMO and Reno, Nevada. In general, data collected from 13 locations indicated that N, S, and organic RM compounds were associated with city and forest locations, halogenated compounds were sourced from the marine boundary layer, and O compounds were associated with long-range transport. Data being developed currently, and in the past, suggest there are multiple forms of RM that modelers must consider, and PBM is an important component of RM.