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| Titel |
Geogenic Groundwater Contamination: A Case Study Of Canakkale - Western Turkey |
| VerfasserIn |
Ozan Deniz, Ayten Çalık |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250133235
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| Publikation (Nr.) |
 EGU/EGU2016-13820.pdf |
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| Zusammenfassung |
| Study area is located NW of Turkey. Total area of the drainage basin is 465 square kilometers
and mostly covered by volcanic rocks. Majority of these rocks have highly altered and lost
their primary properties because of alteration processes. Especially argillic alteration is
common. Tectonic movements and cooling fractures were created suitable circulation
environment of groundwater in the rocks (secondary porosity). Alteration affects the
composition of groundwater and some rock elements pass into groundwater during the
movement of water in the cavities of rocks.
High concentration of natural contaminants related to water-rock interaction in spring
water has been studied in this research. Field measurements such as pH, electrical
conductivity, temperature, oxidation-reduction potential and salinity carried out in 500 water
points (spring, drilling, well and stream). 150 water samples taken from the water points and
50 rock samples taken from the source of springs has been investigated in point of major
anion-cations, heavy metals and trace elements. Some components in the water such as pH
(3.5-9.1), specific electrical conductivity (84-6400 microS/cm), aluminum (27-44902 ppb),
iron (10-8048 ppb), manganese (0.13-8740 ppb), nickel (0.2-627 ppb), lead (0.1-42.5 ppb)
and sulphate (10 to 1940 ppm) extremely high or low in the springs sourced from especially
highly altered Miocene aged volcanic rocks. Some measured parameters highly above
according to European Communities Drinking Water Regulations (2007) and TS266
(2015-Intended for Human Consumption Water Regulations of Turkey) drinking water
standards.
The most common element which is found in the groundwater is aluminum that is higher
than to the drinking water standards (200 microg/L). The highest levels of the Al values
measured in acidic waters with very low pH (3.4) emerging from altered volcanic rocks
because of acid mine drainage in Obakoy district, north of the study area. The abundance of
this element in some water sources is believed to be closely associated with the
alteration of feldspar minerals in the andesite and basalts of the Middle Eocene Sahinli
Formation.
Various studies related to topic show that consumption of these water containing high
aluminum, iron, manganese, nickel and lead for drinking purposes cause serious health
problems (Alzheimer’s, Parkinson’s, physical and mental development disorders in children,
various cancers, stomach - intestinal disorders and skin diseases). This situation limits
the usable groundwater potential and causes potable water scarcity in the region.
Consequently, while using of these groundwater resources in the region, taking
several precautions are necessary and doing new water resource explorations are
recommended.
This study is supported by The Turkish Scientific and Technical Research Institute
(Project number: 113Y577).
Keywords: Geogenic groundwater contamination, Water-Rock Interaction, Canakkale |
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