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| Titel |
Occurrence of PAH Contamination in a Volcanic Rock Aquifer in Relation to Paleoenvironmental Development |
| VerfasserIn |
Otgonbayar Namkhai, Mehmet Ekmekci, Mustafa Değirmenci, Levent Tezcan |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048064
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| Zusammenfassung |
| The volcanic rock aquifer underlying the large plain of Kayseri City, central Turkey is
recharged mainly from snowmelt water from the snow-ice cover of the Erciyes Volcano. The
aquifer is composed of various volcanic rocks of different hydraulic characteristics and has a
high yield owing to the large openings as lava flow tubes and slag layers. Pumping tests
suggested that well yields may be as high as 400 L/sec/m. With regard to inorganic
constituents including trace elements, the groundwater of the volcanic rock aquifer is
classified as very high quality. The total dissolved solids are about 240 mg/l and the hardness
is lower than 14F The volcanic rock aquifer is overlain by alluvium deposits, which form a
secondary aquifer in the region. The shallow groundwater in the alluvial aquifer is
contaminated mainly by domestic wastes and agrochemicals. No evidence was found that the
volcanic rock aquifer is contaminated although the overlying alluvial aquifer is
contaminated by domestic wastes and agrochemicals. This is because, the alluvial aquifer is
separated from the underlying volcanic rock aquifer by thick massive less fractured
basaltic layers. However, the groundwater in the volcanic rock aquifer was found
to be contaminated by polycyclic aromatic hydrocarbons (PAH), considered as
carcinogenic contaminants. Analyses have revealed that the total PAHs occurs in the
groundwater as high as 0.0536 mg/L. The study on the origin of the PAHs suggested that
peat layers that exist in the alluvial deposits overlying the volcanic rock aquifer
are the source of PAHs. The peat layers have occurred within the alluvial deposit
as a result of sequential warm and humid periods in the geological history of the
plain.
This paper aims at demonstrating the importance of the paleohydrologic/paleoenvironmental
development in understanding the hydrogeological systems in terms of water quantity and
quality. |
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