120 4.4.2 Results of the Injection Spike Test.121 5 Recommendations.
111 4.3 Influence of pumping tests on water chemistry.117 4.3.1 On-site parameters during water withdrawal.117 4.3.2 Effects of water withdrawals on Arsenic and other water quality parameters. 78 4.2.2 Depth-dependent variation of the groundwater chemistry.88 4.2.3 Seasonal changes of the groundwater chemistry. 70 4.1.5 Potential evaporation (PE) and actual evapotranspiration (AET).72 4.1.6 Stationary flow modelling.72 4.2 Groundwater chemistry at the test site.78 4.2.1 Quality evaluation of the analyses. 69 Cornelia Härtig Master Thesis page 4 of 150 4.1.4 Levelled water tables at irrigation and test site wells. 66 4.1.3 Conceptual model of the subsurface. 65 4.1.1 Results of water table measurements at the test site.65 4.1.2 Results of the Aquifer tests. 63 3.3.9 Modelling with Visual Modflow.64 4 Results and Discussion.65 4.1 Hydraulic properties of the subsurface at the test site. 58 3.3.4 Hydraulical permeability K based on grain size analyses.59 3.3.5 Transmissivities T and hydraulical permeability K based on aquifer tests.60 3.3.6 Actual evapotranspiration in 2007.62 3.3.7 Map of Titas geography and irrigation wells.63 3.3.8 Contour map of land surface elevation. 55 3.3.1 Error of the analysis and Conductivity check.55 3.3.2 Limit of detection (LOD) and limit of quantitation (LOQ).56 3.3.3 Statistical methods. 52 3.2.1 Determination of TIC and DOC.52 3.2.2 Analysis of anions and cations with IC.52 3.2.3 Flouride determination with an ion sensitive probe.54 3.2.4 Speciation and totals of As and P with AEC-ICP-MS and ICP-MS. 49 3.1.6 Field injection spike.50 3.2 Analytical methods used in laboratory. 36 3.1 Methods in the field.37 3.1.1 Monitoring of the hydro-geochemistry at test site Daudkandi.37 Cornelia Härtig Master Thesis page 3 of 150 3.1.2 Water levels at the test site.44 3.1.3 Aquifer tests.44 3.1.4 Water tables at irrigation wells.48 3.1.5 Well head positions and elevation of the land surface adjacent to wells. 30 2.2.3 Local climate conditions and the water balance. 26 2.2.2 Local groundwater chemistry and water tables. 25 2.2.1 Local geology and sediment geochemistry at Titas.
24 2.2 The test site at the Titas hospital complex. 19 2.1.2 Mobilisation of Arsenic.22 2.1.3 Arsenic speciation in groundwater. 18 2.1.1 Arsenic in the (hydro)geological and (hydro)geochemical context. 18 2.1 General overview on the Arsenic crisis in Bangladesh. 16 1.1 Objectives.16 1.2 Deliverables.16 2 Introduction.