In coastal regions of Bangladesh, sources of irrigation are rain, surface and groundwater. Due to... more In coastal regions of Bangladesh, sources of irrigation are rain, surface and groundwater. Due to rainfall anomaly and saline contamination, it is important to identify deep groundwater that is eligible for irrigation. The main goal of the study was to identify deep groundwater which is suitable for irrigation. Satkhira Sadar Upazila, at the southwestern coastal zone of Bangladesh, was the study area, which was divided into North, Center and South zones. Twenty samples of groundwater were analyzed for salinity (0.65- ...
Low and Intermediate level wastes (LILW) in Bangladesh are being generated from operation, repair... more Low and Intermediate level wastes (LILW) in Bangladesh are being generated from operation, repair and maintenance of 3MW TRIGA MARK-II research reactor (RR), 14 MeV Neutron Generator and research & commercial irradiators such as Co-60 and isotope production for medical purposes. The wastes arising from these sources are generally spent ion exchange resins, graphite, lead and polythene plugs, contaminated vials, hand gloves, plastic syringes, tissue papers, shoe-covers, protective cloths, plastic and metallic wares, spent and disused sources (SRS), activated carbon, gaseous discharges, etc. The radionuclides involved with these wastes areCo-60, Cs134 & 137, Sr-90, Ir-192, Tc-99m, I-131, I-125, C-14, H-3, Ra-226, Am-Be neutron sources, Cm-244, Am-241, Cr-51, Mn-54, Zn-65, P-32, Sc-46, etc. Solid radioactive wastes are collected, segregated at the place of generation and stored in interim-storage rooms of the Central Radioactive Waste Processing and Storage Facility (CWPSF), developed ...
Journal of Radioanalytical and Nuclear Chemistry, 2021
The study investigates the measurement of radon concentration in soils and rocks as a natural tra... more The study investigates the measurement of radon concentration in soils and rocks as a natural tracer for exploring uranium mineralization, first of its kind in Bangladesh. The range of radon concentration was measured as 8–4360 Bq/m3 with an average of 851.41 Bq/m3. Among the measured values, 2120–4360 Bq/m3 was observed in the Tertiary sediments whereas 8–584 Bq/m3 was found in the Recent alluvial soil of different bils and haors. These high radon concentrations are explained by geogenic factors such as mineral content in rocks, alluvium cover, sufficient porosity, probable subsurface fault, and flooding by water streamed through adjacent uranium-rich areas in India. The radon values indicate that the rock formations are promising for uranium mineralization. The radon concentration in rocks and soils are well comparable to the similar studies of the other parts of the world. The results are in good agreement with the previous radiometric survey results, suggestive to extensive exploration activities to confirm uranium mineralization in the area. Moreover, the average annual effective dose of 0.008092 mSv/y in the region calculated from the radon values is within the WHO and ICRP safety limits.
Vertical electrical sounding has been carried out in a coastal area in the southern part of Bangl... more Vertical electrical sounding has been carried out in a coastal area in the southern part of Bangladesh to locate the groundwater aquifers containing fresh water. The Interpex1X1Dv3 computer program was used to process the field apparent resistivity data sets obtained from the vertical electrical sounding. Geoelectric layers were identified in the context of resistivity and thickness from the vertical electrical sounding data. From the initial parameters layered model was achieved using the inversion technique. Correlation of the obtained layer model with a nearby lithologic log concludes the groundwater aquifer system of the area. From the electrical properties of the subsurface layers, water bearing layers were detected and characterized. Very fine sand geoelectric layer with a thickness varying from 20 to 143 meters is an upper aquifer and has 0.66–14.02 Ωm apparent resistivity value. Fine sand geoelectric layer with 0.21-5.99 Ωm apparent resistivity value is lower aquifer with m...
To understand the groundwater flow systems of Bengal Delta, Bangladesh, shallow, intermediate and... more To understand the groundwater flow systems of Bengal Delta, Bangladesh, shallow, intermediate and deep groundwater; major river water and monthly weighted rainfall samples were collected from the study area for major ions and environmental isotope analyses. The shallow and intermediate depth groundwaters are dominantly Ca-Mg-HCO 3 and/or Na-Ca-Mg-HCO 3 types, and the deep groundwaters are mainly of Na-Cl-HCO 3 , Na-Cl and Na-Ca-Mg-Cl types. In deep groundwater, the loss of Ca 2+ are ion exchanged for Na + along the flow paths, which are initially enriched in Ca 2+. A plot of δ 18 O versus δ 2 H of monthly weighted rainfall data collected in Savar area is considered as the Local Meteoric Water Line (δD = 7.7δ 18 O + 10.7) for the study area. Most of the groundwater falls on the meteoric water line, indicating an origin from monsoon rain and floodwater with some evaporation effects for shallow groundwater. The shallow groundwater tritium content varies from 0 to 4.6 TU that are within...
The shallow aquifers (depths <70m) in Meghna basin in eastern Bangladesh contain unacceptably ... more The shallow aquifers (depths <70m) in Meghna basin in eastern Bangladesh contain unacceptably high arsenic concentration (> permissible limit 50 g/L). A comprehensive isotope geochemical study was conducted in four high-arsenic upazilas - Laksham, Chandpur Sadar, Kachua and Lakshmipur to understand the potential of deep aquifer. Two major hydrochemical problems were identified in the deep aquifer, specifically high salinity and unacceptable concentrations of trace elements like iron and manganese. The range of arsenic concentration in all shallow wells is 244–733 g/L. Except for two deep wells in Kachua, which are at intermediate depths ranging from 128 to 137m, contain high arsenic concentrations (range 115–200 g/L). These two samples have heavier stable isotope compositions of oxygen-18 (–2.23 & –3.11 ‰) and deuterium (–16.3 & –17.6 ‰) compared with water samples from similar depths. The compositions also appear to have been affected by evaporation. The isotopic compositi...
Low and Intermediate level wastes (LILW) in Bangladesh are being generated from operation, repair... more Low and Intermediate level wastes (LILW) in Bangladesh are being generated from operation, repair and maintenance of 3MW TRIGA MARK-II research reactor (RR), 14 MeV Neutron Generator and research & commercial irradiators such as Co-60 and isotope production for medical purposes. The wastes arising from these sources are generally spent ion exchange resins, graphite, lead and polythene plugs, contaminated vials, hand gloves, plastic syringes, tissue papers, shoe-covers, protective cloths, plastic and metallic wares, spent and disused sources (SRS), activated carbon, gaseous discharges, etc. The radionuclides involved with these wastes areCo-60, Cs134 & 137, Sr-90, Ir-192, Tc-99m, I-131, I-125, C-14, H-3, Ra-226, Am-Be neutron sources, Cm-244, Am-241, Cr-51, Mn-54, Zn-65, P-32, Sc-46, etc. Solid radioactive wastes are collected, segregated at the place of generation and stored in interim-storage rooms of the Central Radioactive Waste Processing and Storage Facility (CWPSF), developed ...
A total number of twenty topsoil samples were analyzed for heavy metals using X-ray Fluorescence ... more A total number of twenty topsoil samples were analyzed for heavy metals using X-ray Fluorescence System where as radioactivity levels of seven samples were determined by High Purity Germanium (HPGe) detector. The average concentrations of Mn, Zn, Cr, Co and Cu were 584.68, 213.04, 190.33, 164.63 and 100.18 mg/kg respectively in topsoil, which were much above the recommended level as well as higher than their corresponding background values thus indicating environmental pollution. The order of average heavy metal contents was Mn>Zn>Cr>Co>Cu>As>Pb in topsoil. Soil pollution assessment was carried out by using enrichment factor (EF), geoaccumulation index (Igeo), contamination factor (CF), degree of contamination (Cd) and pollution load index (PLI). The soil shows moderate enrichment of Cu and minimal enrichment with Zn, Pb, Cr, As, and Co. Whereas Igeo and CF exhibit moderate to high contamination for Mn, Zn, Cu, Cr and Co. The results of PLI of analyzed heavy metals...
Journal of Radioanalytical and Nuclear Chemistry, 2021
The study investigates the measurement of radon concentration in soils and rocks as a natural tra... more The study investigates the measurement of radon concentration in soils and rocks as a natural tracer for exploring uranium mineralization, first of its kind in Bangladesh. The range of radon concentration was measured as 8–4360 Bq/m3 with an average of 851.41 Bq/m3. Among the measured values, 2120–4360 Bq/m3 was observed in the Tertiary sediments whereas 8–584 Bq/m3 was found in the Recent alluvial soil of different bils and haors. These high radon concentrations are explained by geogenic factors such as mineral content in rocks, alluvium cover, sufficient porosity, probable subsurface fault, and flooding by water streamed through adjacent uranium-rich areas in India. The radon values indicate that the rock formations are promising for uranium mineralization. The radon concentration in rocks and soils are well comparable to the similar studies of the other parts of the world. The results are in good agreement with the previous radiometric survey results, suggestive to extensive exploration activities to confirm uranium mineralization in the area. Moreover, the average annual effective dose of 0.008092 mSv/y in the region calculated from the radon values is within the WHO and ICRP safety limits.
Heavy metals (Pb, As, Zn, Cu, Ni, Co and Cd) concentrations are determined from the Buriganga riv... more Heavy metals (Pb, As, Zn, Cu, Ni, Co and Cd) concentrations are determined from the Buriganga riverbed sediments to evaluate their levels and the distribution by using X-ray fluorescence spectroscopy (XRF). The average concentrations of heavy metals Pb, As, Zn, Cu, Ni, Co and Cd are 4.00, 34.90, 50.70, 49.80, 64.50, 8.90 and 1.17 mg/kg, respectively in river sediments. The average concentration of As, Cu, Ni, Co and Cd exceeds the threshold effect level of Canadian sediment quality guideline in relation to river sediment. Hence, the high concentration of these heavy metals in river sediments may cause serious threat to the aquatic environment and the public health of adjacent people. The order of heavy metal abundances is Ni > Zn > Cu > As > Co> Pb > Cd in present study. Multivariate statistical analyses such as principal component analysis, cluster analysis and correlation matrix shows significant anthropogenic and geogenic intrusions of Pb, As, Zn, Cu, Ni, Co and...
The radioactivity levels of naturally occurring radionuclides 226 Ra, 232 Th and 40 K in thirteen... more The radioactivity levels of naturally occurring radionuclides 226 Ra, 232 Th and 40 K in thirteen topsoil samples, collected from Savar industrial area of Bangladesh, were measured by gamma ray spectrometry system using a High Purity Germanium (HPGe) detector of 40% relative efficiency. The calculated average activity concentrations of 226 Ra, 232 Th and 40 K in the collected samples were 23.31 Bq.kg-1 , 42.24 Bq.kg-1 and 733.19 Bq.kg-1 , respectively. The average activity concentration of 232 Th and 226 Ra in the present study is lower than that of the worldwide average value but the concentration for 40 K is much higher than the world average of 420 Bq.kg-1. The estimated average absorbed dose rate (D), the outdoor annual effective dose (E) and the external hazard index (H ex) were found as 67.08 nGyh-1 , 0.08 mSvy-1 and 0.38 Bq.Kg-1 , respectively. The absorbed dose rate and outdoor annual effective dose are slightly higher than the world average value but the external hazard ind...
Vertical electrical sounding has been carried out in a coastal area in the southern part of Bangl... more Vertical electrical sounding has been carried out in a coastal area in the southern part of Bangladesh to locate the groundwater aquifers containing fresh water. The Interpex1X1Dv3 computer program was used to process the field apparent resistivity data sets obtained from the vertical electrical sounding. Geoelectric layers were identified in the context of resistivity and thickness from the vertical electrical sounding data. From the initial parameters layered model was achieved using the inversion technique. Correlation of the obtained layer model with a nearby lithologic log concludes the groundwater aquifer system of the area. From the electrical properties of the subsurface layers, water bearing layers were detected and characterized. Very fine sand geoelectric layer with a thickness varying from 20 to 143 meters is an upper aquifer and has 0.66–14.02 Ωm apparent resistivity value. Fine sand geoelectric layer with 0.21-5.99 Ωm apparent resistivity value is lower aquifer with m...
A total number of twenty water samples of which seven groundwater, six river water and seven effl... more A total number of twenty water samples of which seven groundwater, six river water and seven effluent samples were collected from Savar industrial area in Bangladesh for heavy metals analysis using ICP-MS system. The average concentration of Fe, Mn, Cr, Zn, As, Ni and Pb were 929.97, 101.01, 6.08, 33.36, 9.18, 2.03 and 3.99 mg/L in groundwater; 286.48, 37.65, 0.13, 9.18, 1.39, 1.53 and 1.26 mg/L in river water and 606.64, 72.71, 5.04, 25.05, 1.72, 2.37 and 1.56 mg/L in effluent, respectively. The average concentration of Cr, Mn, Ni, Fe, Pb, Zn and As exceed WHO and DoE, Bangladesh limits in relation to river water and groundwater. The order of average heavy metal content was Fe>Mn>Zn>Cr>Ni>As>Pb in effluent water, Fe>Mn>Zn>Cr>Pb>Ni>As in groundwater and Fe>Mn>Zn>Ni>As>Pb>Cr in river water. Multivariate statistical analyses such as principal component, cluster analysis and correlation matrix shows significant anthropogenic and geo...
A total number of twenty topsoil samples were analyzed for heavy metals using X-ray Fluorescence ... more A total number of twenty topsoil samples were analyzed for heavy metals using X-ray Fluorescence System where as radioactivity levels of seven samples were determined by High Purity Germanium (HPGe) detector. The average concentrations of Mn, Zn, Cr, Co and Cu were 584.68, 213.04, 190.33, 164.63 and 100.18 mg/kg respectively in topsoil, which were much above the recommended level as well as higher than their corresponding background values thus indicating environmental pollution. The order of average heavy metal contents was Mn>Zn>Cr>Co>Cu>As>Pb in topsoil. Soil pollution assessment was carried out by using enrichment factor (EF), geoaccumulation index (Igeo), contamination factor (CF), degree of contamination (Cd) and pollution load index (PLI). The soil shows moderate enrichment of Cu and minimal enrichment with Zn, Pb, Cr, As, and Co. Whereas Igeo and CF exhibit moderate to high contamination for Mn, Zn, Cu, Cr and Co. The results of PLI of analyzed heavy metals...
The radioactivity levels of naturally occurring radionuclides 226 Ra, 232 Th and 40 K in thirteen... more The radioactivity levels of naturally occurring radionuclides 226 Ra, 232 Th and 40 K in thirteen topsoil samples, collected from Savar industrial area of Bangladesh, were measured by gamma ray spectrometry system using a High Purity Germanium (HPGe) detector of 40% relative efficiency. The calculated average activity concentrations of 226 Ra, 232 Th and 40 K in the collected samples were 23.31 Bq.kg-1 , 42.24 Bq.kg-1 and 733.19 Bq.kg-1 , respectively. The average activity concentration of 232 Th and 226 Ra in the present study is lower than that of the worldwide average value but the concentration for 40 K is much higher than the world average of 420 Bq.kg-1. The estimated average absorbed dose rate (D), the outdoor annual effective dose (E) and the external hazard index (H ex) were found as 67.08 nGyh-1 , 0.08 mSvy-1 and 0.38 Bq.Kg-1 , respectively. The absorbed dose rate and outdoor annual effective dose are slightly higher than the world average value but the external hazard ind...
In coastal regions of Bangladesh, sources of irrigation are rain, surface and groundwater. Due to... more In coastal regions of Bangladesh, sources of irrigation are rain, surface and groundwater. Due to rainfall anomaly and saline contamination, it is important to identify deep groundwater that is eligible for irrigation. The main goal of the study was to identify deep groundwater which is suitable for irrigation. Satkhira Sadar Upazila, at the southwestern coastal zone of Bangladesh, was the study area, which was divided into North, Center and South zones. Twenty samples of groundwater were analyzed for salinity (0.65- ...
Low and Intermediate level wastes (LILW) in Bangladesh are being generated from operation, repair... more Low and Intermediate level wastes (LILW) in Bangladesh are being generated from operation, repair and maintenance of 3MW TRIGA MARK-II research reactor (RR), 14 MeV Neutron Generator and research & commercial irradiators such as Co-60 and isotope production for medical purposes. The wastes arising from these sources are generally spent ion exchange resins, graphite, lead and polythene plugs, contaminated vials, hand gloves, plastic syringes, tissue papers, shoe-covers, protective cloths, plastic and metallic wares, spent and disused sources (SRS), activated carbon, gaseous discharges, etc. The radionuclides involved with these wastes areCo-60, Cs134 & 137, Sr-90, Ir-192, Tc-99m, I-131, I-125, C-14, H-3, Ra-226, Am-Be neutron sources, Cm-244, Am-241, Cr-51, Mn-54, Zn-65, P-32, Sc-46, etc. Solid radioactive wastes are collected, segregated at the place of generation and stored in interim-storage rooms of the Central Radioactive Waste Processing and Storage Facility (CWPSF), developed ...
Journal of Radioanalytical and Nuclear Chemistry, 2021
The study investigates the measurement of radon concentration in soils and rocks as a natural tra... more The study investigates the measurement of radon concentration in soils and rocks as a natural tracer for exploring uranium mineralization, first of its kind in Bangladesh. The range of radon concentration was measured as 8–4360 Bq/m3 with an average of 851.41 Bq/m3. Among the measured values, 2120–4360 Bq/m3 was observed in the Tertiary sediments whereas 8–584 Bq/m3 was found in the Recent alluvial soil of different bils and haors. These high radon concentrations are explained by geogenic factors such as mineral content in rocks, alluvium cover, sufficient porosity, probable subsurface fault, and flooding by water streamed through adjacent uranium-rich areas in India. The radon values indicate that the rock formations are promising for uranium mineralization. The radon concentration in rocks and soils are well comparable to the similar studies of the other parts of the world. The results are in good agreement with the previous radiometric survey results, suggestive to extensive exploration activities to confirm uranium mineralization in the area. Moreover, the average annual effective dose of 0.008092 mSv/y in the region calculated from the radon values is within the WHO and ICRP safety limits.
Vertical electrical sounding has been carried out in a coastal area in the southern part of Bangl... more Vertical electrical sounding has been carried out in a coastal area in the southern part of Bangladesh to locate the groundwater aquifers containing fresh water. The Interpex1X1Dv3 computer program was used to process the field apparent resistivity data sets obtained from the vertical electrical sounding. Geoelectric layers were identified in the context of resistivity and thickness from the vertical electrical sounding data. From the initial parameters layered model was achieved using the inversion technique. Correlation of the obtained layer model with a nearby lithologic log concludes the groundwater aquifer system of the area. From the electrical properties of the subsurface layers, water bearing layers were detected and characterized. Very fine sand geoelectric layer with a thickness varying from 20 to 143 meters is an upper aquifer and has 0.66–14.02 Ωm apparent resistivity value. Fine sand geoelectric layer with 0.21-5.99 Ωm apparent resistivity value is lower aquifer with m...
To understand the groundwater flow systems of Bengal Delta, Bangladesh, shallow, intermediate and... more To understand the groundwater flow systems of Bengal Delta, Bangladesh, shallow, intermediate and deep groundwater; major river water and monthly weighted rainfall samples were collected from the study area for major ions and environmental isotope analyses. The shallow and intermediate depth groundwaters are dominantly Ca-Mg-HCO 3 and/or Na-Ca-Mg-HCO 3 types, and the deep groundwaters are mainly of Na-Cl-HCO 3 , Na-Cl and Na-Ca-Mg-Cl types. In deep groundwater, the loss of Ca 2+ are ion exchanged for Na + along the flow paths, which are initially enriched in Ca 2+. A plot of δ 18 O versus δ 2 H of monthly weighted rainfall data collected in Savar area is considered as the Local Meteoric Water Line (δD = 7.7δ 18 O + 10.7) for the study area. Most of the groundwater falls on the meteoric water line, indicating an origin from monsoon rain and floodwater with some evaporation effects for shallow groundwater. The shallow groundwater tritium content varies from 0 to 4.6 TU that are within...
The shallow aquifers (depths <70m) in Meghna basin in eastern Bangladesh contain unacceptably ... more The shallow aquifers (depths <70m) in Meghna basin in eastern Bangladesh contain unacceptably high arsenic concentration (> permissible limit 50 g/L). A comprehensive isotope geochemical study was conducted in four high-arsenic upazilas - Laksham, Chandpur Sadar, Kachua and Lakshmipur to understand the potential of deep aquifer. Two major hydrochemical problems were identified in the deep aquifer, specifically high salinity and unacceptable concentrations of trace elements like iron and manganese. The range of arsenic concentration in all shallow wells is 244–733 g/L. Except for two deep wells in Kachua, which are at intermediate depths ranging from 128 to 137m, contain high arsenic concentrations (range 115–200 g/L). These two samples have heavier stable isotope compositions of oxygen-18 (–2.23 & –3.11 ‰) and deuterium (–16.3 & –17.6 ‰) compared with water samples from similar depths. The compositions also appear to have been affected by evaporation. The isotopic compositi...
Low and Intermediate level wastes (LILW) in Bangladesh are being generated from operation, repair... more Low and Intermediate level wastes (LILW) in Bangladesh are being generated from operation, repair and maintenance of 3MW TRIGA MARK-II research reactor (RR), 14 MeV Neutron Generator and research & commercial irradiators such as Co-60 and isotope production for medical purposes. The wastes arising from these sources are generally spent ion exchange resins, graphite, lead and polythene plugs, contaminated vials, hand gloves, plastic syringes, tissue papers, shoe-covers, protective cloths, plastic and metallic wares, spent and disused sources (SRS), activated carbon, gaseous discharges, etc. The radionuclides involved with these wastes areCo-60, Cs134 & 137, Sr-90, Ir-192, Tc-99m, I-131, I-125, C-14, H-3, Ra-226, Am-Be neutron sources, Cm-244, Am-241, Cr-51, Mn-54, Zn-65, P-32, Sc-46, etc. Solid radioactive wastes are collected, segregated at the place of generation and stored in interim-storage rooms of the Central Radioactive Waste Processing and Storage Facility (CWPSF), developed ...
A total number of twenty topsoil samples were analyzed for heavy metals using X-ray Fluorescence ... more A total number of twenty topsoil samples were analyzed for heavy metals using X-ray Fluorescence System where as radioactivity levels of seven samples were determined by High Purity Germanium (HPGe) detector. The average concentrations of Mn, Zn, Cr, Co and Cu were 584.68, 213.04, 190.33, 164.63 and 100.18 mg/kg respectively in topsoil, which were much above the recommended level as well as higher than their corresponding background values thus indicating environmental pollution. The order of average heavy metal contents was Mn>Zn>Cr>Co>Cu>As>Pb in topsoil. Soil pollution assessment was carried out by using enrichment factor (EF), geoaccumulation index (Igeo), contamination factor (CF), degree of contamination (Cd) and pollution load index (PLI). The soil shows moderate enrichment of Cu and minimal enrichment with Zn, Pb, Cr, As, and Co. Whereas Igeo and CF exhibit moderate to high contamination for Mn, Zn, Cu, Cr and Co. The results of PLI of analyzed heavy metals...
Journal of Radioanalytical and Nuclear Chemistry, 2021
The study investigates the measurement of radon concentration in soils and rocks as a natural tra... more The study investigates the measurement of radon concentration in soils and rocks as a natural tracer for exploring uranium mineralization, first of its kind in Bangladesh. The range of radon concentration was measured as 8–4360 Bq/m3 with an average of 851.41 Bq/m3. Among the measured values, 2120–4360 Bq/m3 was observed in the Tertiary sediments whereas 8–584 Bq/m3 was found in the Recent alluvial soil of different bils and haors. These high radon concentrations are explained by geogenic factors such as mineral content in rocks, alluvium cover, sufficient porosity, probable subsurface fault, and flooding by water streamed through adjacent uranium-rich areas in India. The radon values indicate that the rock formations are promising for uranium mineralization. The radon concentration in rocks and soils are well comparable to the similar studies of the other parts of the world. The results are in good agreement with the previous radiometric survey results, suggestive to extensive exploration activities to confirm uranium mineralization in the area. Moreover, the average annual effective dose of 0.008092 mSv/y in the region calculated from the radon values is within the WHO and ICRP safety limits.
Heavy metals (Pb, As, Zn, Cu, Ni, Co and Cd) concentrations are determined from the Buriganga riv... more Heavy metals (Pb, As, Zn, Cu, Ni, Co and Cd) concentrations are determined from the Buriganga riverbed sediments to evaluate their levels and the distribution by using X-ray fluorescence spectroscopy (XRF). The average concentrations of heavy metals Pb, As, Zn, Cu, Ni, Co and Cd are 4.00, 34.90, 50.70, 49.80, 64.50, 8.90 and 1.17 mg/kg, respectively in river sediments. The average concentration of As, Cu, Ni, Co and Cd exceeds the threshold effect level of Canadian sediment quality guideline in relation to river sediment. Hence, the high concentration of these heavy metals in river sediments may cause serious threat to the aquatic environment and the public health of adjacent people. The order of heavy metal abundances is Ni > Zn > Cu > As > Co> Pb > Cd in present study. Multivariate statistical analyses such as principal component analysis, cluster analysis and correlation matrix shows significant anthropogenic and geogenic intrusions of Pb, As, Zn, Cu, Ni, Co and...
The radioactivity levels of naturally occurring radionuclides 226 Ra, 232 Th and 40 K in thirteen... more The radioactivity levels of naturally occurring radionuclides 226 Ra, 232 Th and 40 K in thirteen topsoil samples, collected from Savar industrial area of Bangladesh, were measured by gamma ray spectrometry system using a High Purity Germanium (HPGe) detector of 40% relative efficiency. The calculated average activity concentrations of 226 Ra, 232 Th and 40 K in the collected samples were 23.31 Bq.kg-1 , 42.24 Bq.kg-1 and 733.19 Bq.kg-1 , respectively. The average activity concentration of 232 Th and 226 Ra in the present study is lower than that of the worldwide average value but the concentration for 40 K is much higher than the world average of 420 Bq.kg-1. The estimated average absorbed dose rate (D), the outdoor annual effective dose (E) and the external hazard index (H ex) were found as 67.08 nGyh-1 , 0.08 mSvy-1 and 0.38 Bq.Kg-1 , respectively. The absorbed dose rate and outdoor annual effective dose are slightly higher than the world average value but the external hazard ind...
Vertical electrical sounding has been carried out in a coastal area in the southern part of Bangl... more Vertical electrical sounding has been carried out in a coastal area in the southern part of Bangladesh to locate the groundwater aquifers containing fresh water. The Interpex1X1Dv3 computer program was used to process the field apparent resistivity data sets obtained from the vertical electrical sounding. Geoelectric layers were identified in the context of resistivity and thickness from the vertical electrical sounding data. From the initial parameters layered model was achieved using the inversion technique. Correlation of the obtained layer model with a nearby lithologic log concludes the groundwater aquifer system of the area. From the electrical properties of the subsurface layers, water bearing layers were detected and characterized. Very fine sand geoelectric layer with a thickness varying from 20 to 143 meters is an upper aquifer and has 0.66–14.02 Ωm apparent resistivity value. Fine sand geoelectric layer with 0.21-5.99 Ωm apparent resistivity value is lower aquifer with m...
A total number of twenty water samples of which seven groundwater, six river water and seven effl... more A total number of twenty water samples of which seven groundwater, six river water and seven effluent samples were collected from Savar industrial area in Bangladesh for heavy metals analysis using ICP-MS system. The average concentration of Fe, Mn, Cr, Zn, As, Ni and Pb were 929.97, 101.01, 6.08, 33.36, 9.18, 2.03 and 3.99 mg/L in groundwater; 286.48, 37.65, 0.13, 9.18, 1.39, 1.53 and 1.26 mg/L in river water and 606.64, 72.71, 5.04, 25.05, 1.72, 2.37 and 1.56 mg/L in effluent, respectively. The average concentration of Cr, Mn, Ni, Fe, Pb, Zn and As exceed WHO and DoE, Bangladesh limits in relation to river water and groundwater. The order of average heavy metal content was Fe>Mn>Zn>Cr>Ni>As>Pb in effluent water, Fe>Mn>Zn>Cr>Pb>Ni>As in groundwater and Fe>Mn>Zn>Ni>As>Pb>Cr in river water. Multivariate statistical analyses such as principal component, cluster analysis and correlation matrix shows significant anthropogenic and geo...
A total number of twenty topsoil samples were analyzed for heavy metals using X-ray Fluorescence ... more A total number of twenty topsoil samples were analyzed for heavy metals using X-ray Fluorescence System where as radioactivity levels of seven samples were determined by High Purity Germanium (HPGe) detector. The average concentrations of Mn, Zn, Cr, Co and Cu were 584.68, 213.04, 190.33, 164.63 and 100.18 mg/kg respectively in topsoil, which were much above the recommended level as well as higher than their corresponding background values thus indicating environmental pollution. The order of average heavy metal contents was Mn>Zn>Cr>Co>Cu>As>Pb in topsoil. Soil pollution assessment was carried out by using enrichment factor (EF), geoaccumulation index (Igeo), contamination factor (CF), degree of contamination (Cd) and pollution load index (PLI). The soil shows moderate enrichment of Cu and minimal enrichment with Zn, Pb, Cr, As, and Co. Whereas Igeo and CF exhibit moderate to high contamination for Mn, Zn, Cu, Cr and Co. The results of PLI of analyzed heavy metals...
The radioactivity levels of naturally occurring radionuclides 226 Ra, 232 Th and 40 K in thirteen... more The radioactivity levels of naturally occurring radionuclides 226 Ra, 232 Th and 40 K in thirteen topsoil samples, collected from Savar industrial area of Bangladesh, were measured by gamma ray spectrometry system using a High Purity Germanium (HPGe) detector of 40% relative efficiency. The calculated average activity concentrations of 226 Ra, 232 Th and 40 K in the collected samples were 23.31 Bq.kg-1 , 42.24 Bq.kg-1 and 733.19 Bq.kg-1 , respectively. The average activity concentration of 232 Th and 226 Ra in the present study is lower than that of the worldwide average value but the concentration for 40 K is much higher than the world average of 420 Bq.kg-1. The estimated average absorbed dose rate (D), the outdoor annual effective dose (E) and the external hazard index (H ex) were found as 67.08 nGyh-1 , 0.08 mSvy-1 and 0.38 Bq.Kg-1 , respectively. The absorbed dose rate and outdoor annual effective dose are slightly higher than the world average value but the external hazard ind...
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