Arsenic in groundwater
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 2 pptx
... 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 downstream of ... unaffected by arsenic contamination However, Holocene alluvium within narrow entrenched floodplain in the parts of lower-middle Ganga plain in Bihar, Jharkhand and UP are arsenic con...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 4 doc
... -1 0 -1 0 -1 0 -1 0 -1 5 -1 5 -1 5 -1 5 -2 0 -2 0 -2 0 -2 0 -2 5 -2 5 -2 5 -2 5 -3 0 -3 0 -3 0 -3 0 -3 5 -3 5 -3 5 -3 5 -4 0 -4 0 -4 0 -4 0 Depth (meter) 0 10 15 20 25 30 50 100 150 200 -4 5 -4 5 -4 5 -4 5 Total As (mg/kg) ... determined based on the relative intensity of the strongest peak of the constitu...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 5 doc
... Ca2ϩ DOC NHϩ Astot As(III) As(III) Fetot Mn 44 N-1 N-2 N-3 N-4 N -5 N-6 N-7 N-8 N-10 N-11 N-12 N-13 N-14 (deg N) 27.438 27.474 27 .52 0 27 .53 8 27 .52 2 27 .53 4 27 .53 7 27 .54 2 27 .53 7 27 .52 8 27 .53 9 27 .54 4 ... 0. 35 2. 05 0.78 3.82 2.01 1.77 0.23 (mg/L) 0.04 0.32 0.09 0.03 0.07 0.02 1 .55 0.01 0.07 0.08 0.10 0.12 0.18 N- 15 N-16 N-17 N-18 N-20 N-21 N-22 N-23 N-24 N- 25 N-26...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 7 pptx
... the local drinking water standard of 50 g/L The first symptoms of arsenic related diseases were detected in 1983 within the counties of La Banda and Robles, and in the following year investigations ... As (Asox) in all the samples ranging between 0.4–1.4 mg/kg (Fig 5) Comparison of Fe, Al and Mn concentrations extracted by oxalate clearly indicated dominance of Al- and Mn-oxi...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 8 docx
... δ2Η ‰ -5 5 -6 0 -6 5 -7 0 -7 5 -1 1 -1 0 -9 -8 -7 δ 18 ‰ Figure ␦18O vs ␦2H for Tlama well waters plotted with LMWL-Mexico City occurring by PO4-As competitive sorption Phosphate is sorbed and arsenic ... present in five of the nine drinking water sources of Tlamacazapa Four of the five wells used for drinking water contain arsenic concentrations exceeding...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 10 docx
... composition the water characterization in the aquifer of the study area fit into the three main types, viz Na-(K)-Cl-SO4, Ca-(Mg)-Na-(K)-SO4 and Ca-(Mg)-Na-(K)-HCO3 das reported by the earlier works ... Keefer 1994, Bhattacharya et al 2002) in two main inorganic forms: As(III) and As(V) These two forms of inorganic arsenic are mostly found in natural and drinking water (Mariso...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 11 pot
... Natural Arsenic in Groundwater: Occurrence, Remediation and Management – Bundschuh, Bhattacharya and Chandrasekharam (eds) © 2005, Taylor & Francis Group, London, ISBN 04 1536 700 X Arsenic in ... possible contamination from arsenic through the food chain In Groundwater Arsenic Contamination in the Bengal Delta Plains of Bangladesh (Proceedings of the KTH-Dhaka U...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 14 pptx
... arable land and air dried in the laboratory For hastening the drying it was exposed to sunlight After drying in air, the larger aggregate were broken gently by crushing it in a wooden mortar and ... filtration and were allowed to dry in air After drying the algae in air, these were oven-dried and dusted by a blender and the dust algae were latter used for mineralization pr...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 15 ppsx
... 2001) Arsenic is mainly associated with Fe and Mn oxyhydroxides and residual fractions in sediments Arsenopyrite was identified in As-rich sediments influenced by tailings and in the mineralized ... oxyhydroxides and clays in the aquifer matrix (Romero et al 2004b) ARSENIC IN TAILINGS Old and some recent tailing piles are found along the Zimapán town margins The main m...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 16 pptx
... Astot SImackinawite NO-3 Eh (V) S(VI)/S(-II) Na+ Eh (V) As(V)/As(III) CI- Field Eh (V) HCO 3- Sample ID/ Parameter 10 11 12 13 14 -1 00 -2 00 Similarity -3 00 -4 00 -5 00 -6 00 -7 00 -8 00 Figure Results ... Natural Arsenic in Groundwater: Occurrence, Remediation and Management – Bundschuh, Bhattacharya and Chandrasekharam (eds) © 2005, Taylor & Fr...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 17 ppt
... to sub-oxic (2–3 mg/L dissolved oxygen; obtained by bubbling Ar through the medium and storing samples in N2 filled box) conditions containing mM, mM, and mM As(V) and lactate During sampling Eh, ... usually consist of fine-to-medium grained sands Air jet drilling was used to install an 18-m deep well The aquifer sediments were collected in Anero™ (Mitsubishi, Inc.) bags and shipp...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 18 pdf
... meandering stream channels Some of the HFO would be colloidal in size and transported in suspension, larger grains, including HFO-coated sand grains, reside in stream bed load Both suspended and ... 3a and 3b along with As coprecipitation in Fe-sulfide) Thus As-bearing pyrite is a sink for As rather than a source GEO-BIO-HYDRO (GBH) ARSENIC- CYCLING MODEL We propose that a seri...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 20 pptx
... layer L-6 and L-10 after lowering of water table m from the position of WT-1 to WT-2 the water table elevation before and after large-scale well installation and Case-1 and Case-2 reflect hydrologic ... change in oxygen exposure took place at layer L-6 and L-10 before and after introduction of large-scale shallow irrigation wells in Bangladesh was investigated In the diffusi...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 21 ppsx
... 1986 Arsenic( III)-oxidation and removal from drinking water USEPA 60 0-5 2-8 6/ 021 Jekel, M.R 1994 Arsenic removal in water treatment In: Nriagu J (ed.) Arsenic in the Environment, Part 1, Cycling and ... findings about the toxicity of arsenic, especially for long term exposure to low levels in drinking water and food Thus, a number of countries have lowered their dr...
NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 25 ppt
... removal of arsenic and antimony using reverse osmosis membranes Proceedings of the conference on membranes in drinking and industrial water production, volume 1, pages 489–494 ISBN 0-8 668 9-0 6 0-2 , October, ... valence and species of inorganic arsenic are dependent on the oxidation–reduction conditions and the pH of the water Environmental arsenic is mainly found in...