history occurrence detection and management

NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 2 pptx

Ngày tải lên : 12/08/2014, 02:20

... valley courses and converted their lower and adjacent parts to fluvial marshes, lagoons and estuary The ‘middle unit’ comprises silt dominated mud and fine sand that commonly contain wood and other ... Bhagirathi, Jamuna and old Bhramhaputra rivers is entrenched and incised on the Pleistocene terraces during the low stand setting of the terminal Pleistocene period The Pleistocene upland (and hilly belt ... sediments on incised up-lands are oxidized to iron-stained, heavy mineral deficient sand and brown-orange stiff clay These were well flushed by groundwater over longer period and are arsenic free...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 4 doc

Ngày tải lên : 12/08/2014, 02:20

... present geomorphic and groundwater scenario the detection of jarosite and alunite in the recent sedimentary sequence of GBM is very unusual But the presence of peat, iron stained sand and dispersed ... cross-laminations and clay drapes A medium to coarse-grained micaceous yellowish brown thickly bedded sand sequence was encountered between 21 and 30 m Clay drapes were also observed within this sandy sequence ... tidal influence based on the presence of clay drapes and sand lenticels through out the sequence The coarser sandy horizons in the middle and lower part of the sequence can also be interpreted...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 5 doc

Ngày tải lên : 12/08/2014, 02:20

... Kushma Sand 27.46 Coarse sand with gravel 30 Swathi 27.44 Sand-silty clay Gravel km 83.64 Gravel 83.66 Rampurwa 83.68 83.7 83.72 83.74 Rampurwa Clay Clay Sand with gravel Gravel Silty sand-clay Sand-silty ... groundwater (based on Tandukar et al 2001) Sunawal Somnath Sunawal 27.6 Clay Choti Pratappur Khairani Badera Chowk 27.58 Sand Badera Gravel 27.56 Sand-silty clay Silty sand-clay Sukrauli Gravel ... (Fig 2) shows the sequence of gravel and sand-silty clay-clay sequence, which has been exploited for groundwater abstraction MATERIALS AND METHODS 27 private and public tubewells extending to a...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 7 pptx

Ngày tải lên : 12/08/2014, 02:20

... ClϪ and SO2Ϫ were analyzed by a Dionex 120 ion chromatograph, and NOϪ and PO3Ϫ were analyzed using Tecator AQUATEC 5400 analyzer at wavelengths 540 nm and 690 nm, respectively The major and trace ... volcanic ash layer with resulting release of As and Al; (b) precipitation of Al oxide and hydroxides and adsorption of As on Al and Fe mineral phases; and (c) release of As under high pH conditions ... alluvial cone 3.1 MATERIALS AND METHODS Groundwater and sediment sampling Groundwater samples were collected during September–October 2002 from the counties Robles and La Banda (Fig 2), both within...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 8 docx

Ngày tải lên : 12/08/2014, 02:20

... Caliente Complex and is overlain by Mesozoic marine and continental sequences (Fig 1) Massive platform carbonates of the Morelos Formation and thin-bedded calcareous shales, sandstones and conglomerates ... fetching by hand An alternate source of water called Los Sabinos is located km northeast of Tlama (Fig 2) Water is collected and pumped uphill through three pump -and- hold stations and held in ... is dominated by Ca, Mg, and HCO3, as expected for waters interacting with carbonate rocks and/ or calcium-rich soils High concentrations of Cl, K, Na, NO3-N, and SO4, and high electrical conductivity...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 10 docx

Ngày tải lên : 12/08/2014, 02:20

... essentially basal conglomerate and arkosic sandstone of Abeokuta Formation; the limestone and shale members of Ewekoro Formation; the massive and poorly consolidated sandstone of Ilaro Formation ... on this issue LOCATION AND GEOLOGICAL SETTING The study area (i.e Ewekoro Limestone belt of the Dahomey Basin) falls within latitude 6°50ЈN and 7°15ЈN and longitude 3°05ЈE and 3°20ЈE The major ... Plain sands to Late Oligocene Ogwashi Asaba Late Middle & Early Eocene Paleocene Ilaro Late Senonian Ewekoro Formation Coastal Plain sands Eocene Early Oligocene To Middle Eocene Early Eocene and...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 11 pot

Ngày tải lên : 12/08/2014, 02:20

... Groundwater: Occurrence, Remediation and Management – Bundschuh, Bhattacharya and Chandrasekharam (eds) © 2005, Taylor & Francis Group, London, ISBN 04 1536 700 X Arsenic in groundwater and contamination ... the toxic element and eventual exposure of the food chain to As contamination through plant uptake and animal consumption Water (hand tube wells and irrigation pumps), soil and vegetables/crop ... accumulation of this toxic element and eventual exposure to the food chain through plant uptake and animal consumption Between 30 to 40% of net cultivable land is under irrigation and more than 60% of this...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 14 pptx

Ngày tải lên : 12/08/2014, 02:20

... harvested carefully from the pot by 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 ... noncalcareous Grey Floodplain and represented the Dhamrai series, a Typic Haplaquept (mixed, nonacid, silty clay) The soil samples were collected from arable land and air dried in the laboratory ... gently by crushing it in a wooden mortar and passed through a mm sieve Plastic pots of 250 mL sizes, washed with detergent and rinsed with distill water and dried in sunlight, were used for the...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 15 ppsx

Ngày tải lên : 12/08/2014, 02:20

... dissolution and oxidation of As-rich pyrite) may release As and sulfate to those wells FeAsS oxidation is reflected 2Ϫ also in the relatively lower Eh, higher temperature (Armienta et al 2001) and lower ... associated with the low mobility Fe and Al oxyhydroxides, and other residual fractions in four tailing piles in Zimapán Arsenic associated with the most mobile soluble and exchangeable fractions was ... the Fe and Al fraction This indicates that only part of the arsenic may be available to be mobilized The formation of arsenic-bearing secondary minerals, mainly beudantite and jarosite, and As...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 16 pptx

Ngày tải lên : 12/08/2014, 02:20

... Barind and Madhupur tracts, floored with thick surficial oxidized clay and silty clay deposits, and the Holocene lowlands The Holocene lowlands include piedmont plains, flood plains, delta plains and ... PO and low Fetot, and anomalous SO concentrations; Domain with high concentrations of 3Ϫ Astot, and PO , and low concentrations of Fetot, and sulfate; Domain with low concentrations of Astot, and ... to the Chandina Formation The Chandina Formation is overlain by the Meghna alluvium and underlain by the Pleistocene Madhupur Clay and Pliocene Dupi Tila Formation Neotectonic uplifts and course...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 17 ppt

Ngày tải lên : 12/08/2014, 02:20

... coarse to medium sand, fine sand, silt, and clay Aquifer sediments in the deep wells are mostly coarse sands, whereas the shallow wells usually consist of fine-to-medium grained sands Air jet drilling ... implications on As remediation for groundwater treatment and management at these sites 2.1 MATERIALS AND METHODS Sampling sites Adak mine tailings: The abandoned mine tailings at Adak in Västerbotten district ... 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, pH, and oxygen were measured in the microcosms...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 18 pdf

Ngày tải lên : 12/08/2014, 02:20

... overlie Pennsylvanian strata of limestone and shale Alluvial deposits typically consist of sand and gravel deposits of locally intermittent lenses of sand, silt, and clay Groundwater at the KCP site ... at the Alabama field site and collected solid samples below the water table for microbiologic and chemical analyses Both FeRB and SRB were cultured from the aquifer, and enumeration using the ... initially to streams and then through meandering stream channels Some of the HFO would be colloidal in size and transported in suspension, larger grains, including HFO-coated sand grains, reside...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 20 pptx

Ngày tải lên : 12/08/2014, 02:20

... concentration in 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 ... between current theory of arsenic release and role of oxygen shortage and are further addressed in the results and discussion section 2.3 Hydrological factors and their relation to arsenic contamination ... zone would be less than SW and SE zones On the contrary, the SW and SE zones were mostly built up through the sedimentary deposition, and the hydraulic gradient in the SW and SE zones is less; therefore,...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 21 ppsx

Ngày tải lên : 12/08/2014, 02:20

... Natural Arsenic in Groundwater: Occurrence, Remediation and Management – Bundschuh, Bhattacharya and Chandrasekharam (eds) © 2005, Taylor & Francis Group, London, ... water and food Thus, a number of countries have lowered their drinking water standards within the last 13 years (WHO 2001) The lowered standards, mostly to 10 ␮g/L and the “As calamity” in India and ... i.e in the UK and the USA, to smaller decentralized waterworks in Germany and France to a supply by hand pumps, missing any distribution network in the affected areas of West Bengal and Bangladesh...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 25 ppt

Ngày tải lên : 12/08/2014, 02:20

... greensand filtration and other iron/manganese removal processes, and emerging technologies not yet identified (USEPA 2003) Pre-oxidation technology includes chlorination, potassium permanganate, and ... chemical reagents (sulfamic acid and powdered zinc) and test strips Representative samples were also sent to an accredited laboratory for ICP-MS detection 3.1 RESULTS AND DISCUSSION Preliminary test ... natural waters in both organic and inorganic forms but the inorganic arsenic is the most prevalent and is the most likely to exist in significant concentrations The valence and species of inorganic...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 26 pdf

Ngày tải lên : 12/08/2014, 02:20

... up to 475 and 500 pore volumes for the gravity and pump flow conditions, respectively Breakthrough (Ͼ65 ␮g/L and Ͼ60 ␮g/L for gravity and pump flow, respectively) occurred after 333 and 400 h ... Subsequent inline hydride generation with argon and sodium borohydride reductants (3% NaBH4 in 1% NaOH solution) and HG-AAS detection allowed detection of surely total arsenic species down to ... minutes and only the surface areas of the sorbent are highly active during this time period (Vaishya and Prasad 1991) High flow rate might break the binding surface between arsenic and SB and, therefore,...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 29 doc

Ngày tải lên : 12/08/2014, 02:20

... material and sand (Table 2) clearly indicate that the reactant material is nothing but 99% iron and acts as zero-valent iron Surface area value of sand indicates that its adsorption capacity is low and ... (Fig 1) has been designed and fabricated both in plastic and in stainless steel Two filter systems have been designed and evaluated, one operating at a flow rate of 15 L/h and the other operating ... using in the filter The sand used is subjected to physical treatment (washing and heat treatment) prior to using it in the arsenic removal filter The reactant material and sand have been characterized...

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NATURAL ARSENIC IN GROUNDWATER: OCCURRENCE, REMEDIATION AND MANAGEMENT - CHAPTER 30 ppsx

Ngày tải lên : 12/08/2014, 02:20

... Arsenic in Groundwater: Occurrence, Remediation and Management – Bundschuh, Bhattacharya and Chandrasekharam (eds) © 2005, Taylor & Francis Group, London, ISBN 04 1536 700 X Management of the groundwater ... the management by raising the level of awareness about the quality and quantity of the vital resource INTRODUCTION Bangladesh relies intensely on groundwater for rural and urban water supply and ... drinking and irrigation purposes being questioned Groundwater management is in poor state despite large dependence on groundwater The theme of this paper is management of groundwater for safe and...

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Early detection and management of mental disorders - part 1 pps

Ngày tải lên : 12/08/2014, 03:21

... YYePG, c=US, o=TeAm YYePG, ou=TeAm YYePG, email=yyepg@msn.com Reason: I attest to the accuracy and integrity of this document Date: 2005.05.08 17:19:50 +08'00' ...

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Early detection and management of mental disorders - part 3 pptx

Ngày tải lên : 12/08/2014, 03:21

... depression and anxiety disorders (including panic disorder and social phobia), eating disorders and medical conditions The 76 EARLY DETECTION AND MANAGEMENT OF MENTAL DISORDERS onset and course ... behaviour is anti-preventive and demands chronicity and severity as criteria for initial and sustained access Although a consequence of underresourcing and rationing, it stands in stark contrast to ... and structure does make this more achievable and sustainable They are based on recognizing the special characteristics of such patients and applying current standards of optimal care CRISIS MANAGEMENT, ...

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