 |
| Titel |
Chemical composition of background aerosols sampled in Siberia |
| VerfasserIn |
Mikhail Yu. Arshinov, Denis V. Simonenkov, Boris D. Belan, Gennadii N. Tolmachev, Tatyana M. Rasskazchikova, Tatyana K. Sklyadneva, Nina V. Uzhegova |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250050812
|
|
|
|
|
|
| Zusammenfassung |
| The IAO SB RAS has the background measurement site “Fonovaya” located in rural area 60
km west of Tomsk. The aerosol sampling was performed in the framework of field
measurement campaign carried out in July 2010. Two types AFA-HP-20 filters
were used for sampling. Filters of both types were places in one and the same filter
holder to separate particles of two size ranges. The filters of NEL type were used to
collect particles bigger than 0.3 μm, and FPP filters to catch particles less than
0.3 μm. Filter packs were changed daily in the morning. The mean air volume
aspirated through each filter pack was 350 m3. Thus, 20 aerosol samples had been
collected. Then they were analyzed at the Laboratory of Environmental Monitoring
of Tomsk State University. Physico-chemical techniques of quantitative analysis
are used to analyze the chemical composition of the aerosols (Si, Al, Fe, Mg, Ca,
Ti, Cu, Mn, Cr, Ag, Pb, Ni, Ba, Sn, V, Mo, Co, B, Be, K+, Na+, Cl-, SO42-,
NO3-).
It was found that under background conditions a number of heavy and toxic
metals, such as Pb, Cr, Ni, Mo have a tendency to accumulate on fine particles. Their
average relative content in particulate matter collected onto second stage filters were
61, 74, 81 and 50 %, respectively. Also one third of Cu is accumulated on fine
particles. The mean ratio of total inorganic mass in fine and course particles equals 0.1
(M = 0.3 μg/m3 for particles less than 0.3 μ and M = 3 μg/m3 for particles more
than 0.3 μ). The total concentrations of above elements lie in the range from 1
to 5 ng/m3. Moreover, ratios of their standard deviations to average values were
minimal, especially for fine particles. It means that their content in background aerosol
matter is very stable. Evidently, a significant part of these elements are of natural
origin.
This work was funded by Presidium of RAS (Program No. 4), Brunch of Geology,
Geophysics and Mining Sciences of RAS (Program No 5), Russian Foundation for Basic
Research (grants No 11-05-00470 and 11-05-00516), and Ministry of Education
and Science of Russia (State Contracts No 02.740.11.0674 and 14.740.11.0204). |
|
|
|
|
|
|