 |
| Titel |
Urbanization effect on groundwater quality (Paleohydrogeological study) |
| VerfasserIn |
Raghid Sabri, Broder Merkel  , Marion Tichomirowa |
| Konferenz |
EGU General Assembly 2015
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250107628
|
| Publikation (Nr.) |
 EGU/EGU2015-7336.pdf |
|
|
|
|
|
| Zusammenfassung |
| Speleothem growing in caves usually contain hydrological information. Carbonates
precipitation growing in tunnels under cities contain information about anthropological
influence on water system.
Carbonate samples were taken from Roman tunnels in rural and urban area in Nablus
district- Palestine. These laminated samples were analyzed for rare earth elements
(REE), 13C and 18O. For REE, five samples were examined, each lamination was
extracted and diluted with 0.1 ml 65% HNO3 and measured using ICP-MS. Yet,
limited number of lamination was used for isotope analysis using Isotope ratio mass
spectrometry.
Total concentration of rare earth elements were calculated for each of the five samples. In all
examined samples, the newer laminations show higher peaks than the older one
of each sample. On the other hand, one sample (8 measurements) of 13C show
values between -31.6‰ and -36 oṪhese values mean that the carbonate is from
organic origin. In an urban area, wastewater infiltration into groundwater system can
be the source of organic matter. 18O measurements show continues enrichments
within the growth of the carbonate. This increase of the 18O values reflects drier
weather.
Our results can be explained by the increase of water consumption in the household in the
recent 100 years, rather than the increase of using detergents and cleaning products which
have influenced groundwater quality as appeared in the carbonate samples. On the other hand,
18O results could be linked with the expansion of the building up area in the city and
subsequently reduction of groundwater recharge |
|
|
|
|
|
|