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It was reported a clear temporal and seasonal variability of As concentrations in different water samples of Ballia district of eastern U. P. During post monsoon season As concentration decreases in Samples. A definite relationship exists between the behavior of arsenic and rainfall intensity. With increasing rainfall intensity rate of dilution increases which minimizes the arsenic concentration in the groundwater. During monsoon period there is considerable decrease in the arsenic concentration. Groundwater stream design is influenced by water level surface and subsurface redox potential because of seasonal rainfall. During monsoon seasons groundwater level is increased due to its low-land shallow basin and flooding condition also help in rising its groundwater level. For an extensive stretch of the year, the land remains water-logged and this prompts low groundwater flushing rates. In this manner, the watched varieties in mean As concentrations during storm season contrasted with pre rainstorm season. During monsoon time arsenic goes into groundwater by disintegration of Fe(III)- oxy hydroxides and in pre monsoon time arsenic reversibly adsorb on Fe(III)- oxyhydroxides. So these two processes control arsenic concentration during pre monsoon and post monsoon time.
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