4 research outputs found
STUDY OF SEASONAL VARIATION OF ARSENIC CONCENTRATION IN GROUNDWATER IN GHAZIPUR DISTRICT OF UTTAR PRADESH
No full textIt was reported a clear temporal and seasonal variability of as concentrations in different water samples of Ghazipur 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. Groundwater quality depends on the composition of recharging water, the mineralogy and reactivity of the geological formations in aquifers, anthropogenic activities and environmental conditions that may affect the geochemical mobility of certain constituents. Arsenic concentrations in groundwater of the Kathmandu Valley show a wide range and some of groundwater sources investigated were found to be in elevated levels in some parts of the valley could be due to the nature of the sediments there. The high degree of spatial variability in groundwater quality over short distances indicates that groundwater movement has been limited and is poorly mixed. The higher concentration of arsenic under reduced groundwater environment may be due to Fe/Mn oxides and direct reduction of As(V) into As(III). After an initial increase, arsenic concentration often decreases again as a function of time below water table due to sulfide precipitation, whereas it increases with increasing sulfate concentrations above water table. Under moderately reduced environment (0 to 100 mV), arsenic solubility seemed to be controlled by the dissolution of Fe ox hydroxides. But at highly reduced condition, e.g., at −250 mV, arsenic chemistry is dominated by the formation of insoluble sulfides FeAsS, As, As2S3 attenuating concentration of arsenic in the groundwater
TEMPORAL AND SEASONAL VARIATION OF ARSENIC IN BALLIA DISTRICT OF EASTERN U. P.
No full textIt 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
PATH OF GREEN CHEMISTRY AND SUSTAINABLE DEVELOPMENT
No full textScience achieved medicinal unrest till about the center of twentieth century wherein medications and anti-infection agents were found. The world's sustenance supply likewise expanded massively because of the disclosure of half and half assortments, improved techniques for cultivating, better seeds and utilization of bug sprays, herbicides and manures. The personal satisfaction on earth turned out to be vastly improved because of the disclosure of colors, plastics, beauty care products and different materials. Before long, the evil impacts of science likewise wound up articulated, fundamental among them being the contamination of land, water and environment. This is caused basically because of the impacts of results of compound businesses, which are being released into the air, streams/seas and the land. The utilization of harmful reactants and reagents additionally exacerbate things. The contamination achieved such levels that various governments made laws to limit it. This denoted the start of Green Chemistry by the center of 29th century. Practical Chemistry is an idea which adds to accomplishing various objectives of the 2030 Agenda for Sustainable Development (SDGs). It is based among others on the standards of "green science" and has interfaces with significant points for example asset protection, squander the board, word related security, worker and purchaser wellbeing and nourishment. Supportable science joins environmentally suitable arrangements with financial accomplishment under thought of societal and social requests
The Significance of Polymeric Ligand Exchange (PLE) Technique for Arsenic Removal from Polluted Groundwater: A Review
No full textPresently, the global concern over the toxic effects of arsenic and its wide distribution is particularly pronounced in India. This study adopts a specialized geochemical perspective to shed light on the issue. Groundwater in the northeastern states of India has been found to contain notably high concentrations of arsenic (ranging from 50 to 986 μg/l). This geographical region has come under scrutiny due to the escalating worldwide apprehension about arsenic toxicity and its pervasive presence of particular distress is the substantial disparity between the observed arsenic levels and the recommended limits defined by authoritative bodies such as the World Health Organization (WHO) and the Bureau of Indian Standards (BIS), which have set the acceptable arsenic levels in drinking water at 10 μg/l and 50 μg/l, respectively. In response to this critical situation, diverse techniques tailored for targeted removal of arsenic have emerged. These techniques encompass a range of processes including precipitation, adsorption, and modified iron-based and ligand exchange methods.
The inherent characteristics of various arsenic species further compound the challenge of selectively eliminating arsenic, especially when dealing with natural environmental contexts. Notably, hydrated Fe(III) oxides have played a vital role in most selective removal techniques through the mechanism of Lewis acid-base interaction. In this context, a pioneering approach known as Polymeric Ligand Exchange (PLE) has surfaced. This method has exhibited promising results by selectively extracting arsenic from drinking water, even in the presence of formidable competing anions such as sulfate. The efficacy of PLE in overcoming this complex chemical milieu marks a significant stride in the ongoing efforts to mitigate the arsenic contamination crisis
