Geostatistical analysis of arsenic concentration in the groundwater of Malda district of West Bengal, India

Abstract

The problem of arsenic (As) poisoning in the upper deltaic plain of the Ganga-Bhagirathi river system in the Bengal Basin of West Bengal, India is an alarming issue. Four blocks (Kaliachak-1, 2, 3 and English Bazar) of Malda district, West Bengal were critically studied. Geomorphologically, the area exhibits three terraces: the present Youngest terrace (T₀-terrace), the Older Shaugaon Surface (T₁-terrace) and the Oldest Baikunthapur Surface (T₂-terrace). On the basis of numerous measurements, including As-content, pH, DO, specific conductivity and salinity, it was observed that maximum As-content beyond the permissible limit (0.05 mg/L, Indian standard) occurs within a depth range of 10–30 m with a non-linear distribution pattern. Variance test also found that a block effect was highly significant in an As-distribution pattern. Mean arsenic level of Kaliachak block-1 is 0.2253 mg/L, followed by Kaliachak-2 with arsenic level 0.1923, Kaliachak-3 with arsenic level 0.1755 and English Bazar with arsenic level 0.1324. The arsenious belt lies mainly within the Older terrace (T₁). The very recent flood plain deposits of silvery white, fine sands lying very close to the Ganga River margin do not contain significant amounts of As. Elevated As-concentration in the ground water was observed in alluvial sands, grayish white to brownish in color and occurring away from the Ganga margin. The Oldest terrace (T₂) further away from the Ganga margin (e.g. English Bazar) and Barind surface contains less arsenic. Barind surface acts as a hard capping with ferruginous sands and lateritic concretions - chocolate, mottled and purple brown in color - occurring northeast of the studied area. Arsenic content of ground water in the same locality within a radius of ∼ 20 m varies within wide limits. Thus, it poses problem to delineate its distribution pattern. Such a patchy occurrence possibly could not be explained satisfactorily solely by geomorphology. Chemical analysis of aquifer clay samples of the cores shows a maximum As-content of up to 3 mg/kg, whereas the bulk samples (sand-clay mixture) of the cores contain a maximum of 17 mg/kg As-value. Therefore, it is not always true that clay contains elevated As-value.

References

1. Acharyya S K, Chakraborty P, Lahiri S, et al. (1999). Brief communication: Arsenicpoisoning in the Ganges delta. The natural contamination of drinkingwater by arsenic needs to be urgently addressed. Nature, 401: 545. doi: 10.1038/44052
2. Acharyya S K, Lahiri S, Raymahashay B C, et al. (2000). Arsenic toxicity of groundwaterin parts of the Bengal Basin in India and Bangladesh: the role ofQuaternary stratigraphy and Holocene sea-level fluctuations. Environmental Geology, 39: 1127–1137. doi:10.1007/s002540000107
3. Ahmann D, Roberts A L, Krumholz L R, et al. (1994). Microbe grows by reducingarsenic. Nature, 371: 750. doi: 10.1038/371750a0
4. Alam M K, Hassan A K M S, Khan M R, et al. (1990). Geological Map of Bangladesh,scale 1:1 000 000, Geological Survey of Bangladesh, Dhaka
5. Anawar H M, Komaki K, Akai J, et al. (2002). Diagenetic control on arsenicpartitioning in sediments of the Meghna River delta, Bangladesh. Environmental Geology, 41: 816–825. doi:10.1007/s00254-001-0459-x
6. Bandyopadhyay R K (2002). Hydrochemistry of arsenic in Nadia District, West Bengal. Journal Geological Society of India, 59: 33–46
7. Bandyopadhyay U, Mukherjee A, Purkait B (2007). Nonparametric partial sequentialtests for patterned alternatives in multi-sample problems.Sequential Analysis, 26: 443–466. doi: 10.1080/07474940701620915
8. Bibi M H, Ahmed F, Ishiga H (2006). Distribution of arsenic and othertrace elements in the Holocene sediments of the Meghna River Delta,Bangladesh. Environmental Geology, 50: 1243–1253. doi:10.1007/s00254-006-0298-x
9. Berg M, Tran H C, Nguyen T C, et al. (2001). Arsenic contamination ofgroundwater and drinking water in Vietnam: a human health treat. Environ Sci Technol, 35(13): 2621–2626. doi:10.1021/es010027y
10. BGS-DPHE. (2001). Arsenic contamination of groundwater in Bangladesh. In: Kinniburgh D G, Smedley P L, eds. BGS Technical Report WC/00/19. Keyworth: British Geological Survey
11. British Geological Survey, Mott MacDonaldLtd. (1999). Main report:Groundwater studies for arsenic contamination in Bangladesh, Keyworth,UK
12. Chakraborty A K, Saha K C (1987). Arsenicaldermatosis from tube well water in West Bengal. Indian J Med Res, 85: 326–334
13. Chatterjee A, Das D, Mandal B K, et al. (1995). Arsenic in groundwater insix districts of West Bengal, India: the biggest arsenic calamityin the world, Part 1: Arsenic species in drinking water and urineof affected people. Analyst, 120: 643–650. doi:10.1039/an9952000643
14. Chowdhury U K, Rahman M M, Mandal B K, et al. (2001). Groundwater arsenic contaminationand human sufferings in West Bengal, India and Banladesh. Environ Sci, 8: 393–415
15. Das D, Chatterjee A, Mandal B K, et al. (1995). Arsenic in groundwater insix districts of West Bengal, India: the biggest arsenic calamityin the world, Part 2: Arsenic concentration in drinking water, hair,nails, urine, skin-scale and liver tissue (biopsy) of affected people. Analyst, 120(3): 917–924. doi:10.1039/an9952000917
16. Das D, Samanta G, Mandal B K, et al. (1996). Arsenic in groundwater insix districts of West Bengal, India. EnvironmentalGeochemistry and Health, 18(1): 5–15. doi:10.1007/BF01757214
17. Dhar R K, Biswas B K, Samanta G, et al. (1997). Groundwater arsenic calamityin Bangladesh. Current Science, 73(1): 48–59
18. Dowling C B, Poreda R J, Basu A R, et al. (2002). Geochemical study of arsenicrelease mechanisms in the Bengal Basin groundwater. Water Resources Research, 38: 1173–1190. doi:10.1029/2001WR000968
19. Goodbred S L, Kuehl S A (1999). Holoceneand modern sediment budgets for the Ganges-Brahmaputra river system:Evidence for highstand dispersal to flood-plain, shelf and deep-seadepocenters. Geology, 27: 559–562. doi:10.1130/0091-7613(1999)027<0559:HAMSBF>2.3.CO;2
20. Goodbred S L, Kuehl S A (2000). The significanceof large sediment supply, active tectonism, and eustasy on marginsequence development: Late Quaternary stratigraphy and evolution ofthe Ganges-Brahmaputra delta. SedimentGeol, 133: 227–248. doi:10.1016/S0037-0738(00)00041-5
21. Harvey C F, Swartz C H, Badruzzaman A B M, et al. (2002). Arsenicmobility and groundwater extraction in Bangladesh. Science, 298: 1602–1606. doi:10.1126/science.1076978
22. Hastie T, Tibshirani R (1990). Generalizedadditive models. London: Chapman and Hall, 1–334
23. Herbel M, Fendorf S (2006). Biogeochemicalprocesses controlling the speciation and transport of arsenic withiniron coated sands. Chem Geol, 228: 16–32
24. Karim M, Komori Y, Alam M (1997). Arsenic occurrence and depth of contaminationin Bangladesh. J Environ Chem, 7: 783–792
25. Mandal B K, Chowdhury T R, Samanta G, et al. (1996). Arsenic in groundwater inseven districts of West Bengal, India - the biggest arsenic calamityin the world. Current Science, 70(11): 976–986
26. McArthur J M, Banerjee D M, Hudson-Edwards K A, et al. (2004). Naturalorganic matter in sedimentary basins and its relation to arsenic inanoxic groundwater: the example of West Bengal and its worldwide implications. Applied Geochemistry, 19: 1225–1293. doi:10.1016/j.apgeochem.2004.02.001
27. McArthur J M, Ravenscroft P, Safiullah S, et al. (2001). Arsenic in groundwater:testing pollution mechanisms for sedimentary aquifers in Bangladesh. Water Resources Research, 37: 109–117. doi:10.1029/2000WR900270
28. Nickson R T, McArthur J M, Ravenscroft P, et al. (2000). Mechanism of arsenic releaseto groundwater, Bangladesh and West Bengal. Applied Geochemistry, 15(4): 403–413. doi:10.1016/S0883-2927(99)00086-4
29. Oremland R S, Stolz J F (2005). Arsenicmicrobes and contaminated aquifers. Trendsin Microbiology, 13(2): 45–49. doi:10.1016/j.tim.2004.12.002
30. Oremland R S, Kulp T R, Blum J S, et al. (2005). A microbial arsenic cyclein a salt-saturated, extreme environment. Science, 308: 1305–1307. doi:10.1126/science.1110832
31. Pal T, Mukherjee P K, Sengupta S, et al. (2002). Arsenic pollution in groundwaterof West Bengal, India - an insight into the problem by subsurfacesediment analysis. Gondwana Research, 5: 501–512. doi:10.1016/S1342-937X(05)70738-3
32. Purkait B (2007). Incidence of arsenic in the groundwater of upper deltaicplain of the Ganga-Bhagirathi river system, Malda district, West Bengal. Mining, Geological and Metallurgical Institute(MGMI) Transactions, 103(1&2): 99–112
33. Purkait B, Bandyopadhyay R (2007). Arsenictoxicity in the upper Gangetic plain of West Bengal, India. In: Ghosh A, BhattacharyaB, eds. Ecotoxicology and EnvironmentalSciences. Kolkata: acb publications, 28–42
34. Purkait B, Mukherjee A (2006). A statisticalapproach to correlate arsenic contamination in groundwater with somerelated parameters - a case study from Malda district, West Bengal,Eastern India. In: Dandapat B S, Mazumder B S, eds. Proceedings of the International Conference on Application of FluidMechanics in Industry and Environment. Chennai/Singapore: Research Publishing, 173–184
35. Rahman M M, Mandal B K, Chowdhury T R, et al. (2003). Arsenic groundwater contaminationand sufferings of people in North 24-Parganas, one of the nine arsenicaffected districts of West Bengal, India. J Environ Sci Health, art A: Toxic/Hazard Subst Environ Eng, 28: 259
36. Ravenscroft P (2003). An overview of the hydrogeology of Bangladesh, In: Rahman A A, RavenscroftP, Hug S, eds. Groundwater Resources and Development in Bangladesh - Backgroundto the Arsenic Crisis, Agricultural Potential and the Environment. Dhaka: UniversityPress Ltd
37. Ravenscroft P, McArthur J M, Hoque B A (2001). Geochemical and palaeohydrologicalcontrols on pollution of groundwaters by arsenic. In: Chappell W R, Abernathy C O, Calderon R, eds. Arsenic Exposure and Health Effects IV. Oxford: Elsevier Science Ltd
38. Reimann K U (1993). The geology of Bangladesh, Gebrüder Borntraeger,Stuttgart, Germany
39. Sengupta S, Mukherjee P K, Pal T, et al. (2004). Nature and origin of arseniccarriers in shallow aquifer sediments of Bengal Delta, India. Environmental Geology, 45: 1071–1081. doi:10.1007/s00254-004-0965-8
40. Smedley P L, Kinniburgh D G (2002). A reviewof the source, behaviour and distribution of arsenic in natural waters. Appl Geochem, 17: 517–568. doi:10.1016/S0883-2927(02)00018-5
41. van Geen A, Zheng Y, Versteeg R, et al. (2003). Spatial variability of arsenicin 6000 tubewells in a 25 km² area of Bangladesh. Water Resources Research, 39(HWC 3): 1–16
42. Venables W N, Ripley B D (2002). Modernapplied statistics with S. New York: Springer
43. Umitsu M (1993). Late Quaternary sedimentary environments and landformsin the Ganges delta. Sed Geol, 83: 177–186. doi:10.1016/0037-0738(93)90011-S
44. World Health Organization, Geneva. (1993). Guidelines for drinking water quality,recommendations, 2nd ed. 141
45. Yu W, Harvey C M, Harvey C F (2003). Arsenic in groundwater in Bangladesh:A geostatistical and epidemiological framework for evaluating healtheffects and potential remedies. Water ResourcesResearch, 39(WES 1): 1–17