Al Mahmud Tushar - Academia.edu (original) (raw)
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Papers by Al Mahmud Tushar
Environmental science and pollution research international, Jan 7, 2021
High concentrations of naturally-occurring and man-accentuated boron in groundwater possess a pot... more High concentrations of naturally-occurring and man-accentuated boron in groundwater possess a potential threat to the health and well-being of humans worldwide. In Bangladesh, only a few studies focused on the health risks of boron-containing groundwater. Therefore, the present study investigated the spatiotemporal distribution of boron concentrations in groundwater and its associated health risks in the coastal districts of Bangladesh. A total of 268 samples from the shallow and deep wells during the wet and dry season (137 and 131 samples, respectively) were collected to determine the level of boron concentrations and health risk status. The groundwater boron concentrations ranged from 0 to 4.10 mg/L with an average concentration of 0.68 mg/L, which was much lower than the WHO and the values of Bangladesh drinking water standard guideline. The boron concentrations in the shallow wells override the deep ones with insignificant seasonal variation. Boron contamination affected 10% of...
Journal of the Asiatic Society of Bangladesh, Science, 2019
The study deals with pteropods which is an important group of Holoplanktonic mollusks belonging t... more The study deals with pteropods which is an important group of Holoplanktonic mollusks belonging to the class Gastropod. The study attempted to disclose the available pteropods in this region and to attain a clear concept of their abundance and diversity in and around Saint Martin’s Island. The study also attempted to establish pteropods as another significant environmental indicator along with other microfossils in this region. Among the 41 identified species included both Thecosomata and Gymnosomata orders with having a total of 17 families and 19 genera were described. The study was conducted from the ferry ghat to Uttar para and Dakkshin para and covering to the southernmost part of Chera Dwip of the Saint Martin’s island. The study also reveals the diversity and variation of the species with the gradual distance and water depth from land to ocean area. The study identified both the freshwater and Pelagic pteropods. Abundance of Thecosomes was a significant finding which can boos...
Because of having a very good relationship with water column and water chemistry foraminifera are... more Because of having a very good relationship with water column and water chemistry foraminifera are very popular in Paleoenvironmental studies. The present research has assessed the indicative values of salt-marsh foraminifera to reconstruct Paleo-coastline and Mid-Holocene sea level change based on some taxonomic, statistical and morphological parameters derived from the recorded species from Cox’s Bazar to Bardeil area. A total of 51 species representing 40 genera and 35 families were recorded. The plot of the aforementioned parameters of these species on various schematic diagrams reveals marginal-marine to inner-shelf as Paleoenvironment. The paleodepth was estimated as 36.19m from van der Zwaan equation (1990). The age of the recorded species was estimated as 3490 to 3880 years B.P. by carbon dating. A Paleo-coastline has been drawn and about 8mm/year of coastline shifting has been estimated in a GIS environment. Based on the Paleoenvironmental significance of recorded species, a...
The scarcity of arsenic and iron-free safe drinking water is an alarming issue in the southern pa... more The scarcity of arsenic and iron-free safe drinking water is an alarming issue in the southern part of the Bengal Basin. The objectives of the present study were to investigate the spatial distribution of manganese (Mn) concentration in the shallow and deep groundwater and its associated health risks for the children and adults of entire southern Bengal Basin. The Mn concentration in the groundwater varied from 0 to 5.4 mg/L with an average value of 0.47 mg/L that exceeded the WHO’s and Bangladesh drinking water guideline values of 0.4 and 0.1 mg/L, respectively. Mn concentration in the shallow wells overrode the deep ones. About 23% of the shallow wells and 11% of deep wells exceeded theWHO’s safety limit of Mn concentration for human health. The human health risk related toMn contamination was estimated by computing the average daily dosage (ADD) and hazard quotient (HQ) values for children and adults. The average computed HQ values found 0.108 and 0.099 for children and adults, r...
Environmental science and pollution research international, Jan 7, 2021
High concentrations of naturally-occurring and man-accentuated boron in groundwater possess a pot... more High concentrations of naturally-occurring and man-accentuated boron in groundwater possess a potential threat to the health and well-being of humans worldwide. In Bangladesh, only a few studies focused on the health risks of boron-containing groundwater. Therefore, the present study investigated the spatiotemporal distribution of boron concentrations in groundwater and its associated health risks in the coastal districts of Bangladesh. A total of 268 samples from the shallow and deep wells during the wet and dry season (137 and 131 samples, respectively) were collected to determine the level of boron concentrations and health risk status. The groundwater boron concentrations ranged from 0 to 4.10 mg/L with an average concentration of 0.68 mg/L, which was much lower than the WHO and the values of Bangladesh drinking water standard guideline. The boron concentrations in the shallow wells override the deep ones with insignificant seasonal variation. Boron contamination affected 10% of...
Journal of the Asiatic Society of Bangladesh, Science, 2019
The study deals with pteropods which is an important group of Holoplanktonic mollusks belonging t... more The study deals with pteropods which is an important group of Holoplanktonic mollusks belonging to the class Gastropod. The study attempted to disclose the available pteropods in this region and to attain a clear concept of their abundance and diversity in and around Saint Martin’s Island. The study also attempted to establish pteropods as another significant environmental indicator along with other microfossils in this region. Among the 41 identified species included both Thecosomata and Gymnosomata orders with having a total of 17 families and 19 genera were described. The study was conducted from the ferry ghat to Uttar para and Dakkshin para and covering to the southernmost part of Chera Dwip of the Saint Martin’s island. The study also reveals the diversity and variation of the species with the gradual distance and water depth from land to ocean area. The study identified both the freshwater and Pelagic pteropods. Abundance of Thecosomes was a significant finding which can boos...
Because of having a very good relationship with water column and water chemistry foraminifera are... more Because of having a very good relationship with water column and water chemistry foraminifera are very popular in Paleoenvironmental studies. The present research has assessed the indicative values of salt-marsh foraminifera to reconstruct Paleo-coastline and Mid-Holocene sea level change based on some taxonomic, statistical and morphological parameters derived from the recorded species from Cox’s Bazar to Bardeil area. A total of 51 species representing 40 genera and 35 families were recorded. The plot of the aforementioned parameters of these species on various schematic diagrams reveals marginal-marine to inner-shelf as Paleoenvironment. The paleodepth was estimated as 36.19m from van der Zwaan equation (1990). The age of the recorded species was estimated as 3490 to 3880 years B.P. by carbon dating. A Paleo-coastline has been drawn and about 8mm/year of coastline shifting has been estimated in a GIS environment. Based on the Paleoenvironmental significance of recorded species, a...
The scarcity of arsenic and iron-free safe drinking water is an alarming issue in the southern pa... more The scarcity of arsenic and iron-free safe drinking water is an alarming issue in the southern part of the Bengal Basin. The objectives of the present study were to investigate the spatial distribution of manganese (Mn) concentration in the shallow and deep groundwater and its associated health risks for the children and adults of entire southern Bengal Basin. The Mn concentration in the groundwater varied from 0 to 5.4 mg/L with an average value of 0.47 mg/L that exceeded the WHO’s and Bangladesh drinking water guideline values of 0.4 and 0.1 mg/L, respectively. Mn concentration in the shallow wells overrode the deep ones. About 23% of the shallow wells and 11% of deep wells exceeded theWHO’s safety limit of Mn concentration for human health. The human health risk related toMn contamination was estimated by computing the average daily dosage (ADD) and hazard quotient (HQ) values for children and adults. The average computed HQ values found 0.108 and 0.099 for children and adults, r...