Arsenic in Surface Water of Murshidabad, West Bengal, India: An Unprecedented Situation

2016 ◽  
Vol 3 (1) ◽  
pp. 49-55
Keyword(s):  
Surface Water ◽  
West Bengal

Assessment of the surface water quality improvement during pandemic lockdown in ecologically stressed Hooghly River(Ganges) Estuary, West Bengal, India

2021 ◽  
Vol 171 ◽  
pp. 112711
Author(s):  
Santanu Chakraborty ◽  
Kunal Sarkar ◽  
Shreya Chakraborty ◽  
Ananya Ojha ◽  
Arjun Banik ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Surface Water ◽  
West Bengal ◽  
Surface Water Quality ◽  
Water Quality Improvement ◽  
River Ganges

The geochemical and isotopic composition of ground waters in West Bengal: tracing ground-surface water interaction and its role in arsenic release

2008 ◽  
Vol 72 (1) ◽  
pp. 441-444 ◽  
Author(s):  
M. Lawson ◽  
C. J. Ballentine ◽  
D. A. Polya ◽  
A. J. Boyce ◽  
D. Mondal ◽  
...  
Keyword(s):  
Surface Water ◽  
Isotopic Composition ◽  
Ground Water ◽  
Meteoric Water ◽  
West Bengal ◽  
Concentration Limit ◽  
Future Health ◽  
Rock Interaction ◽  
Ground Waters ◽  
Deep Aquifers

AbstractIn many areas of south and south-eastern Asia, concentrations of As in ground water have been found to exceed the WHO maximum concentration limit of 10 μg/l. This is adversely affecting the health of millions of people and has grave current and future health implications. It has recently been suggested that extensive abstraction of ground water in these areas may accelerate the release of As to ground water. This study uses geochemical and isotopic data to assess this hypothesis. The area investigated in this study is in the Chakdaha block of the Nadia District, West Bengal. The ground water is predominantly of the Ca-Mg-HCO3 type, although some samples were found to contain elevated concentrations of Na, Cl and SO4. This is thought to reflect a greater degree of water-rock interaction at the locations of these particular samples. Arsenic concentrations exceeded the national limit of 50 μg/l in 13 of the 22 samples collected. Four of the 13 samples with high As were recovered from tubewells with depths of 60 m or more. Shallow ground water samples were found to have a stable isotopic composition which falls subparallel to the Global Meteoric Water Line. This probably represents a contribution of evaporated surface water to the ground water, possibly from surface ponds or re-infiltrating irrigation water. Deep ground water, conversely, was shown to have a composition that closely reflects that of meteoric water. The data presented in this study suggest that, whilst the drawdown of surface waters may drive As release in shallow ground waters, it is not responsible for driving As release in deep ground water. However, local abstraction may have resulted in changes in the ground water flow regime of the area, with contaminated shallow ground waters being drawn into previously uncontaminated deep aquifers.

Application of a Simple Cold Stub to the Direct Observation of Frozen Hydrated Sand

1973 ◽  
Vol 31 ◽  
pp. 212-213
Author(s):  
John M. Wehrung ◽  
Richard J. Harniman
Keyword(s):  
United States ◽  
Surface Water ◽  
Direct Observation ◽  
Controlled Study ◽  
Clay Particles ◽  
Organic Debris ◽  
Rock Formations ◽  
Water Tables ◽  
Permeable Rock ◽  
Natural Means

Water tables in aquifer regions of the southwest United States are dropping off at a rate which is greater than can be replaced by natural means. It is estimated that by 1985 wells will run dry in this region unless adequate artificial recharging can be accomplished. Recharging with surface water is limited by the plugging of permeable rock formations underground by clay particles and organic debris.A controlled study was initiated in which sand grains were used as the rock formation and water with known clay concentrations as the recharge media. The plugging mechanism was investigated by direct observation in the SEM of frozen hydrated sand samples from selected depths.

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