 |
| Titel |
Measuring and modeling mercury in the atmosphere: a critical review |
| VerfasserIn |
Mae Sexauer Gustin, H. M. Amos, J. Huang, M. B. Miller, K. Heidecorn |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 10 ; Nr. 15, no. 10 (2015-05-26), S.5697-5713 |
| Datensatznummer |
250119750
|
| Publikation (Nr.) |
 copernicus.org/acp-15-5697-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| Mercury (Hg) is a global health concern due to its toxicity and ubiquitous
presence in the environment. Here we review current methods for measuring
the forms of Hg in the atmosphere and models used to interpret these data.
There are three operationally defined forms of atmospheric Hg: gaseous
elemental mercury (GEM), gaseous oxidized mercury (GOM), and particulate
bound mercury (PBM). There is relative confidence in GEM measurements
(collection on a gold surface), but GOM (collection on potassium chloride
(KCl)-coated denuder) and PBM (collected using various methods) are less
well understood. Field and laboratory investigations suggest the methods to
measure GOM and PBM are impacted by analytical interferences that vary with
environmental setting (e.g., ozone, relative humidity), and
GOM concentrations measured by the KCl-coated denuder can be too low by a
factor of 1.6 to 12 depending on the chemical composition of GOM. The
composition of GOM (e.g., HgBr2, HgCl2, HgBrOH) varies across
space and time. This has important implications for refining existing
measurement methods and developing new ones, model/measurement comparisons,
model development, and assessing trends. Unclear features of previously
published data may now be re-examined and possibly explained, which is
demonstrated through a case study. Priorities for future research include
identification of GOM compounds in ambient air and development of
information on their chemical and physical properties and GOM and PBM
calibration systems. With this information, identification of redox
mechanisms and associated rate coefficients may be developed. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|