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Automated Stable Isotope Sampling of Gaseous Elemental Mercury (ISO-GEM): Insights into GEM Emissions from Building Surfaces

Jiskra, Martin and Marusczak, Nicolas and Leung, Kin-Hung and Hawkins, Lucas and Prestbo, Eric and Sonke, Jeroen E.. (2019) Automated Stable Isotope Sampling of Gaseous Elemental Mercury (ISO-GEM): Insights into GEM Emissions from Building Surfaces. Environmental Science and Technology, 53 (8). pp. 4346-4354.

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Official URL: https://edoc.unibas.ch/70268/

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Abstract

Atmospheric monitoring networks quantify gaseous elemental mercury (GEM) concentrations, but not isotopic compositions. Here, we present a new method for automated and quantitative stable isotope sampling of GEM (ISO-GEM) at the outlet of a commercial Hg analyzer. A programmable multivalve manifold selects Hg at the analyzer inlet and outlet based on specific criteria (location, time, GEM concentration, auxiliary threshold). Outlet Hg recovery was tested for gold traps, oxidizing acidic solution traps, and activated carbon traps. We illustrate the ISO-GEM method in an exploratory study on the effect of building walls on local GEM. We find that GEM concentrations directly at the building surface (wall inlet) are significantly enhanced (mean 3.8 ± 1.8 ng/m; 3; ) compared to 3 m from the building wall (free inlet) (mean 1.5 ± 0.4 ng/m; 3; ). GEM δ; 202; Hg (-1.26‰ ± 0.41‰, 1 SD, n = 16) and Δ; 199; Hg (-0.05‰ ± 0.10‰, 1 SD, n = 16) at the wall inlet were different from ambient GEM δ; 202; Hg (0.76‰ ± 0.09‰, 1 SD, n = 16) and Δ; 199; Hg (-0.21‰ ± 0.05‰, 1 SD, n = 16) at the free inlet. The isotopic fingerprint of GEM at the wall inlet suggests that GEM emission from the aluminum building surface affected local GEM concentration measurements. These results illustrate the versatility of the automated Hg isotope sampling.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften
UniBasel Contributors:Jiskra, Martin
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
ISSN:0013-936X
e-ISSN:1520-5851
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:09 Jul 2019 14:09
Deposited On:09 Jul 2019 14:09

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