Underground tube-well water is one of the most important sources of pure drinking water in the world.Drinking water contamination with heavy metals (iron and arsenic) is a burning question nowadays for public health and also environmental perspectives. Our present task is for determination of iron and arsenic concentration in ground tube-well with possible health risk in Bangladesh. The water samples were collected from Tangail district of Bangladesh during January 2017. Iron and arsenic concentration were analyzed by using Atomic Absorption Spectrophotometer. Iron concentration ranged from 4.483 to 20.698 mg/l where arsenic concentration was obtained from <0.001 to 0.01969 mg/l in the studied samples. Arsenic concentration for most of the samples and all iron samples were higher than the maximum permissible level of World Health Organization due to drinking these water. Iron is a heavy metal may cause serious health risk to study area people. In Bangladesh, permissible limit of iron is 0.3-1.0 mg/l, whereas WHO standard level is 0.3 mg/l. All the samples were exceeded the standard levels of iron. A range of 20 to 60 times higher iron concentration reported than permissible limits in tube-well water of the study area. These higher iron concentrations found in the study area may be harmful to those people who are consuming the water from these sources on regular basis and they may pose a high health risk. Thus, to overcome this problem, the consumers should not drink groundwater containing higher amounts of iron, and they should find other sources or replace the tube-well or treat the water for drinking and other domestic and household purposes.
This study investigated the long-term changes in climatological condition, such as temperature, rainfall, humidity, storms, and tidal surge and flooding in Barguna district of Bangladesh. The BMD (Bangladesh Meteorological Department) data were used for temperature, rainfall, and humidity. The data for storms have been collected from secondary sources i.e. various journals, website and various records. This study applied the time series statistical test to examine the long-term changes in climatological condition, such as temperatures (1970-2015), rainfall (1975-2013), humidity (1975-2013), and storms (1987-2007). A parametric technique of trend analysis was used in this study for its inclusive use and simplicity. Data screening and filling missing values were also done before the analyses. The analyses of measured temperature indices that the annual average maximum and minimum mean temperature has increased 1.16°C and 0.56°C respectively at the end of 2015 since 1982 indicating that the weather has been becoming hotter. The analysis of the last 30 years rainfall data of Barguna was compared with national total annual rainfall and no significant change observed. The number of wetter days has been increasing over the time and more rainfall has been happening within small time. There is also a significant change in relative humidity. A total of thirty-five depressions, storms and cyclones hit Barguna district during the last 130 years among which hard hit severe cyclones have occurred in 1935, 1965, 1970 and the most recent cyclone SIDR in 2007 was notable. The study found that storm surge level and surge induced coastal flooding reached from the outfall of Baleshwar River up to 50 km upstream at Morrelganj with high surge level. Therefore, this study will provide a condensed view in further studies in advanced statistical modeling in combination with future scenario analysis for micro and macro scale climate variable changes in Bangladesh.
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