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474 results on '"Pekdeger, A."'

16. Methoden der Gewinnung geochemischer Parameter

Author

Engelmann, Frank, Voigt, Hans-Jürgen, van Straaten, Leonardo, Hesser, Fred, Eckelmann, Wolf, Utermann, Jens, Wippermann, Thomas, Böhme, Christian, Flachowsky, Johannes, Kettrup, Antonius, Knecht, Josef, Lintelmann, Jutta, Lucht, Hartmut, Nießner, Reinhard, Kersten, Michael, Pekdeger, Asaf, Maiwald, Ulrike, von Jarmersted, Christian Sommer, Winkler, Andreas, Demmert, Stephan, Asmus, Detlef, Voigt, Hans-Jürgen, and Wippermann, Thomas

Published
1998
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18. Status of organochlorine pesticides in the drinking water well-field located in the Delhi region of the flood plains of river Yamuna

Author

P. K. Mutiyar, A. K. Mittal, and A. Pekdeger

Subjects
Technology, Environmental technology. Sanitary engineering, TD1-1066
Abstract

This study presents the occurrence of pesticides in a well-field located in Yamuna flood plain of Delhi region. Ground water sampling campaigns were carried out during pre-monsoon and post-monsoon periods covering 21 borewells and 5 Ranney wells. Major 17 organochlorine pesticides (OCP's) along with other water quality parameters were monitored during this period. Pesticide concentrations were determined using GC-ECD, while GC-MS was used for confirmatory purposes. OCP's groups like ∑HCH, ∑DDT, endosulfan and aldrin were observed in this well-field. Concentration of OCPs from Ranney well exceeded the limit (1 μg l−1) prescribed by the Bureau of Indian Standards (BIS) in pre-monsoon season, though OCP levels in borewells were within BIS limits. However, these levels were very close to the World Health Organisation (WHO) and European Union (EU) limit of for pesticides (0.5 μg l−1) in many samples. Borewell produced better quality water compared to the water from Ranney wells. Although, the level of OCP's was slightly lower than prescribed limit of national regulatory agency but such low doses may cause long-term damage to human populations if such water is consumed for longer durations. At low doses OCP's acts as endocrine disrupting agent and cause metabolic disorders in local population.

Published
2011
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50. Geochemical processes during riverbank filtration in a polder region bordering the river Oder, Germany

Author

Asaf Pekdeger, Gudrun Massmann, and Christoph Merz

Subjects
Hydrology, geography, geography.geographical_feature_category, Aquifer, River water, Redox, law.invention, chemistry.chemical_compound, Groundwater chemistry, chemistry, law, Environmental science, Sulfate, Drainage, Groundwater, Filtration
Abstract

Large scale geochemical processes were investigated in the river-recharged aquifer of the Oderbruch polder. As a consequence of intensive drainage activities in the past 250 years, river water infiltrates permanently into this shallow confined aquifer. A lateral sequence of redox zones, characterized by either the presence or absence of a redox species, can be found with increasing time and travel distance in the aquifer. Up to 3 km from the river, reduction processes from oxygen respiration to sulfate reduction dominate the groundwater chemistry. Further inland, changing hydraulic conditions cause a predominant influence of the seepage water on the groundwater, resulting in a high sulfate, low pH zone.

Published
2020

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