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首页> 外文会议>International symposium on the measurement of toxic and related air pollutants >Comparison of Mercury Measurements in Snow with ISCST3 Model-Predicted Deposition Near an Industrial Emission Source in Southeastern Idaho
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Comparison of Mercury Measurements in Snow with ISCST3 Model-Predicted Deposition Near an Industrial Emission Source in Southeastern Idaho

机译：爱达荷州东南部工业排放源附近ISCST3模型预测的沉积物中雪中汞测量的比较

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摘要

Snow samples collected within 12 km of a major (9 g/hour) mercury emissions source inrnsoutheastern Idaho were evaluated for total and methylmercury concentrations (ng L~(-1)),rnconverted to mercury deposition using the sample location snow water equivalent (SWE),rnand compared to predicted deposition values from the ISCST3 air dispersion/depositionrnmodel. Model runs were made for a range of scavenging coefficients for both particulaternand vapor form. Mercury concentrations in snow near the source (μ = 5.3 ng L~(-1)) werernsimilar to published values in precipitation at other remote U.S. locations and were aboutrntwice those measured in the Teton Range (μ= 2.7 ng L~(-1)) located 180 km downwind tornthe east. Estimated deposition was very low at the site because of the low annualrnprecipitation (22 cm y~(-1)). ISCST3 model predicted-to-observed (P/O) ratios forrndeposition averaged from 0.6 to 1.9 across all sampling locations with the best modelrnperformance obtained using a scavenging coefficient for small (0.1 – 0.25 um)rnparticulates and the assumption that all of the mercury is reactive Hg(II) and subject tornlocal deposition. The default modeling assumptions recommended by the U.S. EPA forrnmercury Hg(II) vapor speciation in combustion facility risk assessments would havernunderpredicted local mercury deposition from this source by a factor of approximately 2.
机译：在爱达荷州东南部主要爱达荷州汞排放源（12 g /小时）的12 km内收集的雪样的总和甲基汞浓度（ng L〜（-1））进行了评估，使用样品位置当量雪水当量（SWE）转换为汞沉积），并与ISCST3空气扩散/沉积模型的预测沉积值进行比较。针对颗粒形式和蒸气形式的清除系数范围进行模型运行。源附近雪中的汞浓度（μ= 5.3 ng L〜（-1））与美国其他偏远地区的降水中公布的值相似，约为提顿范围内测得的汞浓度的两倍（μ= 2.7 ng L〜（-1））。 ）位于下风向东180公里处。由于年降水量低（22 cm y〜（-1）），该地点的估计沉积量非常低。 ISCST3模型在所有采样位置的沉积沉积的预测观测值（P / O）平均值平均为0.6至1.9，使用小（0.1 – 0.25 um）清除系数并假设所有汞均为活性Hg（II）并易于局部沉积。在燃烧设施风险评估中，美国EPA推荐的汞汞（II）蒸汽形态建议的默认建模假设可能会将这种来源的局部汞沉积预测降低了约2倍。

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