کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6308040 1618840 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Gas-exchange chamber analysis of elemental mercury deposition/emission to alluvium, ore, and mine tailings
ترجمه فارسی عنوان
تجزیه و تحلیل محفظه مبدل گاز رسوب / انتشار جیوه عنصر به آلومینیوم، سنگ معدن و معادن
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


- Atmospheric deposition and emission of Hg was investigated in a laboratory setting.
- Deposition/emission of elemental Hg to and from 3 materials was investigated.
- The impact of water addition, light, and ozone showed synergistic effects.
- Mean elemental Hg deposition velocities (0.13-0.46 cm s−1) varied with material.
- Flux was also influenced by material grain size, chemistry, and primary mineralogy.

Deposition of mercury (Hg) from the atmosphere is an important source of this contaminant to terrestrial ecosystems. Once deposited, all forms of Hg can be retained or emitted back to the atmosphere. Distinguishing between volatilization of geogenic or indigenous Hg and that deposited from the atmosphere is difficult. Field flux measurements in the general area of two industrial scale gold mining operations, showed local deposition of Hg emitted from point and nonpoint sources, and subsequent re-emission. The work presented in this paper investigated deposition/emission of elemental Hg to and from alluvium and two mine materials before, during, and after exposure to high air concentrations, for both wet and dry conditions, using a laboratory gas exchange chamber and a Hg permeation source. In general, results showed a range in mean elemental Hg deposition velocities ranging from 0.13 to 0.46 cm s−1 that varied with material. A significant influence of atmospheric ozone (O3) on flux was observed that depended on the material and whether wet or dry. A synergistic relationship existed between O3 and light promoting Hg flux, and flux was also influenced by material grain size, chemistry, and primary mineralogy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 131, July 2015, Pages 209-216
نویسندگان
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