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| Titel |
Influence of marine aerosols and aerotechnogenic load on chemical composition of rainwaters on small islands (ludas) of the White Sea |
| VerfasserIn |
Tamara Gorbacheva, Svetlana Mazukhina, Ludmila Isaeva, Oleg Shumilov |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250073786
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| Zusammenfassung |
| In June 2001 intensive monitoring plots were established on the island part of Kandalaksha
Bay of the White Sea (the island Tonnaya Luda; 67o06’60”N; 32o24’12”E) with the
installation of stationary rainwater collectors. The purpose was studying the chemical
composition of rain waters in the zone of cumulative influence of marine aerosols and
aerotechnogenic load. Water sampling was carried out monthly during the vegetative season
of 2001 and 2002. pH of rain water was determined by potentiometric method without
preliminary filtration. The samples were passed through the paper filter with the pore
diameter of 1-2.5 microns, the analysis of filtrate carried out by methods of atomic emission
spectrometry (K, Na) and atomic absorption spectrometry (Ca, Mg, Zn, Mn, Cu, Ni, Al, Fe),
total P and P of phosphates, Si and NH4+ - by photocolorimetry, total carbon -
by bichromate method, NO3-, SO42-, Cl--by ion exchange chromatography
method.
Balance method was chosen as a research basis to determine the interrelation of rain
water organic matter and dynamics of its redistribution under the influence of natural and
technogenic factors. The difference between the cations sum (including NH4+and H+) and
mineral acids anions sum (SO42-, Cl-, NO3-) was identified as organic acids anions
concentration (μeq l-1).
The level of Na, Cl-, K, Ca, Mg, SO42-, Sr in rainwaters on the island and the remote
areas is indicative of the possible influence of marine aerosols on the island part of the White
Sea. The increase of Al, Cu, Ni, Cd, Co concentrations in rainwaters up to one order against
the background values points to the cumulative influence of the emissions of industrial
enterprises located in the region.
The relative stability of pH values of rain waters during all seasons indicates to the buffer
action of weak organic acids anions. The correlation analysis of ionic structure in normal
concentrations has allowed us to estimate the distribution of the cationic part from the
interrelation with the anionic part on the basis of statistically significant positive correlation
coefficients (n=15). So, H+and Ca 2+ ions are related mainly with organic acids anions
(r=0.67 and 0.47 respectively), NH4+, K+, Mg 2+- with SO42-(r=0.78, 0.73 and 0.58
respectively). It is impossible to exclude the interrelation of organic acids anions and Mg
2+(r=0.38).
The calculations of input parameters for physical and chemical modeling have been
carried out to estimate the elements distribution through relations metals form with organic
acids’ anions. The findings show the domination of the simple salts of low-molecular organic
acids (acetates, formates) in rainwaters and the presence of metals with a variable valency in
reduced state (Fe2+, Ni2+) that can be caused by the existence of reducers as part of the
organic matter of waters. |
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