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

... (Acharyya 20 02) . 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 ... Holocene entrenched floodplain in parts of lower-middle Gangetic plain in Bihar and eastern UP. Sediment cover on Pleistocene uplands in the Bengal Basin as well as, in i...

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... K + 40 f 20 80 60 4 0 60 - 40 40 SO 4 60 20 d b a 40 60 e c 20 g Ca + Mg 2+ 40 20 2- SO 4 + Cl + NO 3 20 - - 80 80 Mg 2+ Cl - + NO 3 - 2- Figure 3. Representation of major ion chemistry in groundwater ... 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...

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... reported in the top layer of soils (Huq et al. 20 01). The increased As content after 30 d 122 0 10 20 30 40 50 60 70 0 2. 5 12. 5 25 .0 50.0 Arsenic applied in water (mg) As content in algae, mg kg -1 Figure ... management of arsenic patients in Bangladesh. In Arsenic in the Asia-Pacific Region Abstracts, p. 65, CSIRO-ACIAR, Australia. 124 Copyright © 20 05...

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... acceptors in a reaction like: 141 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 400 300 20 0 100 1000 Component 1 Component 2 2000 3000 0 -1 00 -2 00 Figure ... 8 .26 ϫ 10 Ϫ3 24 59.4 0.08 Ϫ0.03 Ϫ1.51 Ϫ1.31 1 .24 ϫ 10 2 25 62. 5 Ϫ0.55 Ϫ1.91 Ϫ1.41 Ϫ1. 42 1.13 ϫ 10 2 26 64.0 0. 82 2.66 0.48 2. 18 2. 45 ϫ 10 Ϫ3 27 64.0 0....

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... meters (from WT-1 to WT -2 ) did not increase the dissolved oxygen concentration at the hypothetical arsenic contaminated layers at L-6 and L-10 (Fig. 2) . The oxygen concentration in Case-1 at layer L-6 was ... that introduction of organic carbon by over-pumping of irrigation wells can be a factor in increasing arsenic mobility in shal- low groundwater in Bangladesh (Roach 20...

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... 0.103 16.3 2. 35 0.1 12 17 .2 0. 72 0.14 23 .0 2. 02 0. 124 23 .9 2. 78 0.069 24 .5 3.50 0.099 24 .8 3.54 0 .21 6 25 .1 3.64 Leaching does not occur 25 .8 0.74 Leaching does not occur 28 .2 63.1* Leaching does ... 2. 43 1.90 2. 39 0.09 0.14 15 0.44 21 .5 62. 15 15.96 6.96 0.81 2. 65 1.73 1.56 3.00 0. 12 0. 12 55 0.58 21 .5 68.15 12. 77 5 .25 0.61 2. 02 2. 02 1.97 2....

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... 1.4 0.1 2. 8 36.4 2. 1 21 .8 1 02. 4 22 .7 3 .2 120 .4 120 .1 99.78 3. 82 0.08 N- 12 27.539 83.670 16.8 6.49 Ϫ0.131 525 18.0 0 .2 0.1 53.6 1.6 29 .4 96.9 21 .2 1.4 120 .3 115.9 96.33 2. 01 0.10 N-13 27 .544 83.676 ... 89.8 28 .2 1.6 26 5.4 26 2.5 98.88 3 .28 0.03 N-5 27 . 522 83. 627 16.8 7 .29 Ϫ0.105 440 1.0 0.1 bdl 24 .0 1.4 30.5 91.9 25 .1 0.9 34.9 33.7 96.55 3.30 0.07...

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... 23 1 9 6 32 77 17 0.4 1 2 1 0.9 8 25 2 Taxco el – 24 6.3 22 7 1 1037 161 11 1 10 42 27 0.3 20 5 190 Viejo Juliantla – 22 6.6 173 1 994 138 17 1 19 64 22 0 .2 211 24 3 Coxcatlán 35 18 6.9 181 1 10 62 179 ... 7.3 22 0 4 590 69 33 0 2 2 5 1 33 25 0 Mixicapan 1.8 16 6.8 186 5 735 78 36 2 5 8 1 1 52 310 Los Sabinos – 20 6.7 188 2 776 81 39 0.1 1 2 0 1 8 27 0 Regional wat...

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... (␮S/cm) R 2 As conc Ϫ0.653 0.105 Ϫ0 .21 8 Ϫ1.8 82 Ϫ1.895 57.5 (Ϫ0.543) (1.9 32) ( 2. 001) ( 2. 308) (Ϫ1.544) As conclogTf Ϫ8. 729 1.173 2. 696 Ϫ0 .20 7 2. 214 58 .2 (Ϫ0. 620 ) (1.841) ( 2. 006) ( 2. 429 ) (Ϫ1.543) Values ... 0.04 Elebute 23 .0 23 .5 7.0–7.5 3.6–4 .2 316–334 0.06–0.14 0.10 Egbado 23 .0 24 .0 7.4–7.8 3.6–4 .2 146–193 0.06–0.08 0.07 Lapeleke 24 .0 24 .1 7.1–8.0 1.9 2. 3...

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... Perspective.ITN-Bangladesh, BUET, Dhaka, Bangladesh, ISBN 98 4-3 2- 0 350-X, pp. 20 3 22 6. Huq, S.M.I., Rahman, A., Sultana, N. & Naidu, R. 20 03. Extent and severity of arsenic contamination in soils of ... 95 Natural Arsenic in Groundwater: Occurrence, Remediation and Management – Bundschuh, Bhattacharya and Chandrasekharam (eds) © 20 05, Taylor & Fra...

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