... local drinking water standard of 50g/L. The first symptoms of arsenic
related diseases were detected in 1983 within the counties of La Banda and Robles, and in the fol-
lowing year investigations ... oxalate
clearly indicated dominance of Al- and Mn-oxides and -hydroxides as compared to Fe-oxides and
hydroxides (Fig. 6). Much higher concentrations at site CH 47 seem to be re...
... 2002).
2 ARSENIC AFFECTED FLOOD-DELTA PLAINS IN WEST BENGAL
Pandemic arsenic contamination in the Bengal Basin is essentially confined to the low-lying
Ganga-Brahmaputra flood-delta plain located ... Jharkhand and eastern Uttar
Pradesh (UP; Fig. 1). The upper permissible limit of arsenic in potable water is set at 50g/L in
17
Natural Arsenic in Groundwater: Occurren...
... P.N. 1983. Arsenic, Antimony, Germanium and Tin in the Jyo estuary,
Portugal-modeling a polluted estuary. Environ. Sci. Tech. 17: 73 1 73 7.
BADC 2002. Survey Report on Irrigation Equipment and Irrigated ... nutrient recycling process. This is obviously a major concern vis-a-vis soil
pollution and contamination of the food chain through water-soil-crop transfer of contaminants.
This...
... ϽϪ0.254 1.55
Similarity
HCO
3
-
CI
-
Na
+
NO
-
3
Mn
Fe
tot
PO
4
3-
K
+
pH
SO
4
2-
Mg
2+
Ca
2+
EC
As
tot
0
-1 00
-2 00
-3 00
-4 00
-5 00
-6 00
-7 00
-8 00
12345 678 91011121314
Figure 5. Results of Hierarchical ... 19 97. , Occurrence of arsenic contaminated groundwater in allu-
vial aquifers from Delta Plains, Eastern India: Options for safe dri...
... dur-
ing pumping. But arsenic contaminated wells do not show any concentration gradient during
pumping in Bangladesh. In addition, the oxidation theory of arsenic release can not explain why
arsenic ... value always remains low in SW and SE region. Only
mixing with oxygenated water or lack of reductant minerals can maintain the desired oxic condi-
tion in SW and SE regions,...
... composition the water characterization in the
aquifer of the study area fit into the three main types, viz. Na-(K)-Cl-SO
4
, Ca-(Mg)-Na-(K)-SO
4
and Ca-(Mg)-Na-(K)-HCO
3
das reported by the earlier ... previous study in which high levels of arsenic were obtained in the soils collected
85
Natural Arsenic in Groundwater: Occurrence, Remediation and Management –
Bunds...