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首页> 外文期刊>Environmental Science & Technology >Mercury speciation in coal-fired power plant plumes observed at three surface sites in the southeastern US
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Mercury speciation in coal-fired power plant plumes observed at three surface sites in the southeastern US

机译：在美国东南部的三个地面站点观察到的燃煤电厂烟气中的汞形态

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摘要

Elemental Hg (Hg-0), reactive gaseous Hg (RGM) and fine particulate Hg (Hg-P) were measured intermittently at three sites in the southeastern U. S. from June 2001 through November 2004. Simultaneous measurements of SO2 and NOy were used to identify plumes from coal fired power plants (CFPPs). Emission signatures and back trajectories were used to identity specific CFPPs, and to compare observed (i.e., at the site) versus expected (i.e., at the stack) Hg speciation. Results for 41 precipitation-free plume events show that observed RGM: SO2 is substantially lower (by a factor of 2-4) than expected RGM: SO2. HgP represented 2%, or less, of total-Hg in CFPP plumes, in general agreement with emission estimates. Results for 21 events, where both RGM and Hg-0 could be estimated, show that total-Hg (i.e., RGM + Hg-0) was essentially conserved from the point of emission to the site, and that Hg-0 was the dominant form ( average 84%). Emission estimates, based on coal analyses and the EPRI-ICR Hg speciation model, indicate that Hg-0 should represent about 42% of Hg in the observed plumes. Possible explanations for these differences include, but are not limited to, in-plume reduction of RGM to Hg-0, measurement error, errors in emission estimates, and depositional losses. Further work is needed to confirm these results and to determine if they apply to CFPPs in general, or the limited set of observed CFPPs.
机译：从2001年6月至2004年11月，在美国东南部的三个地点间断地测量了元素汞（Hg-0），反应性气态汞（RGM）和细颗粒汞（Hg-P）。同时使用SO2和NOy的测量值来确定燃煤电厂（CFPP）的烟羽。排放特征和反向轨迹用于识别特定的CFPP，并比较观察到的（即在现场）与预期的（即在烟囱中）汞形态。 41次无沉淀羽流事件的结果表明，观察到的RGM：SO2大大低于预期的RGM：SO2（降低了2-4倍）。总的来说，HgP占CFPP羽流中总Hg的2％或更少，与排放估算值基本一致。可以估计RGM和Hg-0的21个事件的结果表明，从排放到现场，总Hg（即RGM + Hg-0）基本上是保守的，而Hg-0是主要的形式（平均84％）。基于煤炭分析和EPRI-ICR汞形态模型的排放估算表明，在观察到的羽流中，Hg-0约占Hg的42％。这些差异的可能解释包括但不限于将RGM降低到Hg-0的量内测量，测量误差，排放估算误差和沉积损失。需要进一步的工作来确认这些结果，并确定它们是否适用于CFPP，或者是适用于观察到的CFPP的有限集合。

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