Interrelationship of TOC, As, Fe, Mn, Al and Si in shallow alluvial aquifers in Chapai-Nawabganj, Northwestern Bangladesh: implication for potential source of organic carbon

摘要: Two boreholes and ten piezometers in the Ganges flood plain were drilled installed for collecting As-rich sediments groundwater. Groundwater samples from collected analysis of cations (Ca2+, Mg2+, K+, Na+), anions (Cl−, NO3−, SO42−), total organic carbon (TOC), trace elements (As, Mn, Fe, Sr, Se, Ni, Co, Cu, Mo, Sb, Pb). X-ray powder diffraction was performed to characterize major mineral contents aquifer fluorescence (XRF) analyze chemical composition alluvial sediments. Results XRF clearly show that fine-grained contain higher amounts element because their high surface area adsorption. Relative index (15–38 QSU) humic substance groundwater measured using spectrofluorometer, results revealed contains less matter (OM). Arsenic concentration water ranges 2.8 170 μg/L (mean 50 μg/L) plain. content 2.1 14 mg/kg 4.58 mg/kg) plains. TOC 0.49 3.53 g/kg 1.64 g/kg) is positively correlated with (R2 = 0.55) this Humic substances extracted Fourier transform infrared substances. The source assigned δ13C values obtained elemental analysis-isotope ratio mass spectrometry (EA-IRMS); (−10 −29.44‰) strongly support hypothesis OM terrestrial origin.