Arsenic contamination of groundwater - wikipedia Arsenic contamination of groundwater Groundwater arsenic contamination areas Arsenic contamination of groundwater is a form of groundwater pollution which is often due to naturally occurring high concentrations of arsenic in deeper levels of groundwater. It is a high - profile problem due to the use of deep tubewells for water supply in the Ganges Delta, causing serious arsenic poisoning to large numbers of people. A 2007 study found that over 137 million people in more than 70 countries are probably affected by arsenic poisoning of drinking water. The problem became serious health concern after mass poisoning of water in Bangladesh. Arsenic contamination of ground water is found in many countries throughout the world, including the US. Approximately 20 major incidents of groundwater floarsenic contamination have been reported. Of these, four major incidents occurred in Asia, in Thailand, Taiwan, and Mainland China. The location of potentially hazardous wells have been mapped in China. Contents 1 Speciation of arsenic compounds in water 2 Contamination specific nations and regions 2.1 Pakistan 2.2 Bangladesh 2.3 Chile 2.4 India and Bangladesh 2.5 Argentina 2.6 United States 2.6. 1 Regulation 2.6. 2 Case studies and incidents 2.7 Nepal 3 Water purification solutions 3.1 Small - scale water treatment 3.2 Large - scale water treatment 4 Dietary intake 5 See also 6 References 7 Further reading 8 External links Speciation of arsenic compounds in water Arsenic contaminated water typically contains arsenous acid and arsenic acid or their derivatives. Their names as `` acids '' is a formality, these species are not aggressive acids but are merely the soluble forms of arsenic near neutral pH. These compounds are extracted from the underlying rocks that surround the aquifer. Arsenic acid tends to exist as the ions ( HAsO ) and ( H AsO ) in neutral water, whereas arsenous acid is not ionized. Arsenic acid ( H AsO ), arsenous acid ( H AsO ) and their derivatives are typically encountered in arsenic contaminated ground water. Contamination specific nations and Regions Pakistan Contaminated Water Could Poison 60 Million in Pakistan in 2017 With ' Alarmingly High ' Arsenic Levels. 50 - 60 million people are consuming highly contaminated water which is above 50 ppb ( WHO recommended is 10 ppb ). A recent report ( Science, 2017 ) Shows more the investigation of 1200 samples was carried out and approximately more than 66 % samples contained arsenic above WHO recommended limit. Bangladesh Bangladesh is the most affected country by arsenic poisoning through drinking water. Govt. and other agencies like UNICEF installed wells to provide fresh water in underdeveloped areas of Bangladesh, but later on they found disease related to consumption of this water. About 7 - 11 million wells or hand pumped wells are providing arsenic polluted water to local people. 20 % of the total deaths are related to arsenic related cancer here. Chile Estimation of Arsenic Intake from Drinking Water and Food ( Raw and Cooked ) in a Rural Village of Northern Chile. Urine as a Biomarker of Recent Exposure ( 2015 ). India and Bangladesh Arsenic contamination of the groundwater in Bangladesh is a serious problem. Prior to the 1970s, Bangladesh had one of the highest infant mortality rates in the world. Ineffective water purification and sewage systems as well as periodic monsoons and flooding exacerbated these problems. As a solution, UNICEF and the World Bank advocated the use of wells to tap into deeper groundwater. Millions of wells were constructed as a result. Because of this action, infant mortality and diarrheal illness were reduced by fifty percent. However, with over 8 million wells constructed, approximately one in five of these wells is now contaminated with arsenic above the government 's drinking water standard. In the Ganges Delta, the affected wells are typically more than 20 meters and less than 100 meters deep. Groundwater closer to the surface typically has spent a shorter time in the ground, therefore likely absorbing a lower concentration of arsenic ; water deeper than 100 m is exposed to much older sediments which have already been depleted of arsenic. The issue came to international attention in 1995. The study conducted in Bangladesh involved the analysis of thousands of water samples as well as hair, nail, and urine samples. They found 900 villages with arsenic above the government limit. Criticism has been leveled at the aid agencies, who denied the problem during the 1990s while millions of tube wells were sunk. The aid agencies later hired foreign experts who recommended treatment plants that were inappropriate to the conditions, were regularly breaking down, or were not removing the arsenic. In West Bengal, India, water is mostly supplied from rivers. Groundwater comes from deep tubewells, which are few in number. Because of the low quantity of deep tubewells, the risk of arsenic poisoning in West Bengal is comparatively less. According to the World Health Organisation, `` In Bangladesh, West Bengal ( India ), and some other areas most drinking - water used to be collected from open dug wells and ponds with little or no arsenic, but with contaminated water transmitting diseases such as diarrhoea, dysentery, typhoid, cholera, and hepatitis. Programmes to provide ' safe ' drinking - water over the past 30 years have helped to control these diseases, but in some areas they have had the unexpected side - effect of exposing the population to another health problem -- arsenic. '' The acceptable level as defined by WHO for maximum concentrations of arsenic in safe drinking water is 0.01 mg / L. The Bangladesh government 's standard is a fivefold greater rate, with 0.05 mg / L being considered safe. WHO has defined the areas under threat : Seven of the twenty districts of West Bengal have been reported to have ground water arsenic concentrations above 0.05 mg / L. The total population in these seven districts is over 34 million while the number using arsenic - rich water is more than 1 million ( above 0.05 mg / L ). That number increases to 1.3 million when the concentration is above 0.01 mg / L. According to a British Geological Survey study in 1998 on shallow tube - wells in 61 of the 64 districts in Bangladesh, 46 percent of the samples were above 0.01 mg / L and 27 percent were above 0.050 mg / L. When combined with the estimated 1999 population, it was estimated that the number of people exposed to arsenic concentrations above 0.05 mg / L is 28 - 35 million and the number of those exposed to more than 0.01 mg / L is 46 - 57 million ( BGS, 2000 ). Throughout Bangladesh, as tube wells get tested for concentrations of arsenic, ones which are found to have arsenic concentrations over the amount considered safe are painted red to warn residents that the water is not safe to drink. One solution is `` By using surface water and instituting effective withdrawal regulation. West Bengal and Bangladesh are flooded with surface water. We should first regulate proper watershed management. Treat and use available surface water, rain - water, and others. The way we 're doing ( it ) at present is not advisable. '' Another avenue would be looking at the nutrition content which is also seen to be responsible for mitigating the effects of Arsenic. Malnutrition is seen to increase the adverse effects of arsenic. In Bihar, Groundwater in 13 districts have been found to be contaminated with Arsenic with quantities exceeding 0.05 mg / L. All these districts are situated close to large rivers like Ganga and Gandak. Argentina The central portion of Argentina is affected by arsenic - contaminated groundwater. Specifically, the La Pampa produces water containing 4 - 5300 microgram As per litre. United States Regulation A drinking water standard of 0.05 mg / L ( equal to 50 parts per billion, or ppb ) arsenic was originally established in the United States by the Public Health Service in 1942. The Environmental Protection Agency ( EPA ) studied the pros and cons of lowering the arsenic Maximum Contaminant Level ( MCL ) for years in the late 1980s and 1990s. No action was taken until January 2001, when the Clinton administration in its final weeks promulgated a new standard of 0.01 mg / L ( 10 ppb ) to take effect January 2006. The Bush administration suspended the midnight regulation, but after some months of study, the new EPA administrator Christine Todd Whitman approved the new 10 ppb arsenic standard and its original effective date of January 2006. Many locations exceed this limit. A 2017 Lancet Public Health study found that this rule change led to fewer cancer deaths. Many public water supply systems across the United States obtained their water supply from groundwater that had met the old 50 ppb arsenic standard but exceeded the new 10 ppb MCL. These utilities searched for either an alternative supply or an inexpensive treatment method to remove the arsenic from their water. In Arizona, an estimated 35 percent of water - supply wells were put out of compliance by the new regulation ; in California, the percentage was 38 percent. The proper arsenic MCL continues to be debated. Some have argued that the 10 ppb federal standard is still too high, while others have argued that 10 ppb is needlessly strict. Individual states are able to establish lower arsenic limits ; New Jersey has done so, setting a maximum of 0.005 mg / L for arsenic in drinking water. A study of private water wells in the Appalachian mountains found that six percent of the wells had arsenic above the U.S. MCL of 0.010 mg / L. Case studies and incidents Fallon, Nevada has long been known to have groundwater with relatively high arsenic concentrations ( in excess of 0.08 mg / L ). Even some surface waters, such as the Verde River in Arizona, sometimes exceed 0.01 mg / L arsenic, especially during low - flow periods when the river flow is dominated by groundwater discharge. A study conducted in a contiguous six - county area of southeastern Michigan investigated the relationship between moderate arsenic levels and 23 selected disease outcomes. Disease outcomes included several types of cancer, diseases of the circulatory and respiratory system, diabetes mellitus, and kidney and liver diseases. Elevated mortality rates were observed for all diseases of the circulatory system. The researchers acknowledged a need to replicate their findings. Nepal Nepal is subject to a serious problem with arsenic contamination. The problem is most severe in the Terai region, the worst being near Nawalparasi District, where 26 percent of shallow wells failed to meet WHO standard of 10 ppb. A study by Japan International Cooperation Agency and the Environment in the Kathmandu Valley showed that 72 % of deep wells failed to meet the WHO standard, and 12 % failed to meet the Nepali standard of 50 ppb. Water purification solutions Small - scale water treatment A review of methods to remove arsenic from groundwater in Pakistan summarizes the most technically viable inexpensive methods. A simpler and less expensive form of arsenic removal is known as the Sono arsenic filter, using three pitchers containing cast iron turnings and sand in the first pitcher and wood activated carbon and sand in the second. Plastic buckets can also be used as filter containers. It is claimed that thousands of these systems are in use and can last for years while avoiding the toxic waste disposal problem inherent to conventional arsenic removal plants. Although novel, this filter has not been certified by any sanitary standards such as NSF, ANSI, WQA and does not avoid toxic waste disposal similar to any other iron removal process. In the United States small `` under the sink '' units have been used to remove arsenic from drinking water. This option is called `` point of use '' treatment. The most common types of domestic treatment use the technologies of adsorption ( using media such as Bayoxide E33, GFH, or titanium dioxide ) or reverse osmosis. Ion exchange and activated alumina have been considered but not commonly used. Chaff - based filters have been reported to reduce the arsenic content of water to 3 microgram / litre. This is especially important in areas where the potable water is provided by filtering the water extracted from the underground aquifer. Large - scale water treatment In some places, such as the United States, all the water supplied to residences by utilities must meet primary ( health - based ) drinking water standards. Regulations may need large - scale treatment systems to remove arsenic from the water supply. The effectiveness of any method depends on the chemical makeup of a particular water supply. The aqueous chemistry of arsenic is complex, and may affect the removal rate that can be achieved by a particular process. Some large utilities with multiple water supply wells could shut down those wells with high arsenic concentrations, and produce only from wells or surface water sources that meet the arsenic standard. Other utilities, however, especially small utilities with only a few wells, may have no available water supply that meets the arsenic standard. Coagulation / filtration ( also known as flocculation ) removes arsenic by coprecipitation and adsorption using iron coagulants. Coagulation / filtration using alum is already used by some utilities to remove suspended solids and may be adjusted to remove arsenic. Iron oxide adsorption filters the water through a granular medium containing ferric oxide. Ferric oxide has a high affinity for adsorbing dissolved metals such as arsenic. The iron oxide medium eventually becomes saturated, and must be replaced. The sludge disposal is a problem here too. Activated alumina is an adsorbent that effectively removes arsenic. Activated alumina columns connected to shallow tube wells in India and Bangladesh have removed both As ( III ) and As ( V ) from groundwater for decades. Long - term column performance has been possible through the efforts of community - elected water committees that collect a local water tax for funding operations and maintenance. It has also been used to remove undesirably high concentrations of fluoride. Ion exchange has long been used as a water softening process, although usually on a single - home basis. Traditional anion exchange resins are effective in removing As ( V ), but not As ( III ), or arsenic trioxide, which does n't have a net charge. Effective long - term ion exchange removal of arsenic requires a trained operator to maintain the column. Both Reverse osmosis and electrodialysis ( also called electrodialysis reversal ) can remove arsenic with a net ionic charge. ( Note that arsenic oxide, As O, is a common form of arsenic in groundwater that is soluble, but has no net charge. ) Some utilities presently use one of these methods to reduce total dissolved solids and therefore improve taste. A problem with both methods is the production of high - salinity waste water, called brine, or concentrate, which then must be disposed of. Subterranean Arsenic Removal ( SAR ) Technology SAR Technology In subterranean arsenic removal ( SAR ), aerated groundwater is recharged back into the aquifer to create an oxidation zone which can trap iron and arsenic on the soil particles through adsorption process. The oxidation zone created by aerated water boosts the activity of the arsenic - oxidizing microorganisms which can oxidize arsenic from + 3 to + 5 state SAR Technology. No chemicals are used and almost no sludge is produced during operational stage since iron and arsenic compounds are rendered inactive in the aquifer itself. Thus toxic waste disposal and the risk of its future mobilization is prevented. Also, it has very long operational life, similar to the long lasting tube wells drawing water from the shallow aquifers. Six such SAR plants, funded by the World Bank and constructed by Ramakrishna Vivekananda Mission, Barrackpore & Queen 's University Belfast, UK are operating in West Bengal. Each plant has been delivering more than 3,000 litres of arsenic and iron - free water daily to the rural community. The first community water treatment plant based on SAR technology was set up at Kashimpore near Kolkata in 2004 by a team of European and Indian engineers led by Bhaskar Sen Gupta of Queen 's University Belfast for TiPOT. SAR technology had been awarded Dhirubhai Ambani Award, 2010 from IChemE UK for Chemical Innovation. Again, SAR was the winner of the St. Andrews Award for Environment, 2010. The SAR Project was selected by the Blacksmith Institute - New York & Green Cross - Switzerland as one of the `` 12 Cases of Cleanup & Success '' in the World 's Worst Polluted Places Report 2009. ( Refer : www.worstpolluted.org ). Currently, large scale SAR plants are being installed in US, Malaysia, Cambodia, and Vietnam. Dietary intake Researchers from Bangladesh and the United Kingdom have claimed that dietary intake of arsenic adds a significant amount to total intake where contaminated water is used for irrigation. See also Arsenic poisoning Grainger challenge Toxic heavy metal References Jump up ^ See : `` Arsenic in drinking water seen as threat, '' USAToday.com, August 30, 2007. See page 6 of : Peter Ravenscroft, `` Predicting the global distribution of arsenic pollution in groundwater. '' Paper presented at : `` Arsenic -- The Geography of a Global Problem, '' Royal Geographic Society Arsenic Conference held at : Royal Geographic Society, London, England, August 29, 2007. This conference is part of The Cambridge Arsenic Project. Jump up ^ Smedley, PL ; Kinniburgh, DG ( 2002 ). `` A review of the source, behaviour and distribution of arsenic in natural waters ''. Applied Geochemistry. 17 ( 5 ) : 517 -- 568. doi : 10.1016 / S0883 - 2927 ( 02 ) 00018 - 5. Jump up ^ Mukherjee A. ; Sengupta M.K. ; Hossain M.A. ( 2006 ). `` Arsenic contamination in groundwater : A global perspective with emphasis on the Asian scenario '' ( PDF ). Journal of Health Population and Nutrition. 24 ( 2 ) : 142 -- 163. Jump up ^ Chowdhury U.K. ; Biswas B.K. ; Chowdhury T.R. ( 2000 ). `` Groundwater arsenic contamination in Bangladesh and West Bengal, India ''. Environmental Health Perspectives. Brogan & # 38. 108 ( 4 ) : 393 -- 397. doi : 10.2307 / 3454378. JSTOR 3454378. PMC 1638054. PMID 10811564. Jump up ^ Rodríguez - Lado L., Sun G., Berg M., Zhang Q., Xue H., Zheng Q., Johnson C.A. ( 2013 ). `` Groundwater arsenic contamination throughout China ''. Science. 341 ( 6148 ) : 866 -- 868. doi : 10.1126 / science. 1237484. CS1 maint : Multiple names : authors list ( link ) Jump up ^ `` Arsenic in drinking water threatens up to 60 million in Pakistan ''. Science AAAS. 2017 - 08 - 23. Retrieved 2017 - 09 - 11. Jump up ^ Uddin, Riaz ; Huda, Naz Hasan ( May 2011 ). `` Arsenic Poisoning in Bangladesh ''. Oman Medical Journal. 26 ( 3 ) : 207. doi : 10.5001 / omj. 2011.51. ISSN 1999 - 768X. PMC 3191694. PMID 22043419. Jump up ^ `` How the West poisoned Bangladesh ''. The Independent. 2010 - 03 - 21. Retrieved 2017 - 09 - 17. Jump up ^ `` Bangladesh : 20 Million Drink Arsenic - Laced Water ''. Human Rights Watch. 2016 - 04 - 06. Retrieved 2017 - 09 - 17. Jump up ^ Diaz, Oscar Pablo ; Arcos, Rafael ; Tapia, Yasna ; Pastene, Rubén ; Velez, Dínoraz ; Devesa, Vicenta ; Montoro, Rosa ; Aguilera, Valeska ; Becerra, Miriam ( 2015 - 05 - 22 ). `` Estimation of Arsenic Intake from Drinking Water and Food ( Raw and Cooked ) in a Rural Village of Northern Chile. Urine as a Biomarker of Recent Exposure ''. International Journal of Environmental Research and Public Health. 12 ( 5 ) : 5614 -- 5633. doi : 10.3390 / ijerph120505614. Jump up ^ Singh A.K. ( 2006 ). `` Chemistry of arsenic in groundwater of Ganges - Brahmaputra river basin '' ( PDF ). Current Science. 91 ( 5 ) : 599 -- 606. Jump up ^ David Bradley, `` Drinking the water of death '', The Guardian, 5 January 1995 Jump up ^ Amit Chatterjee ; Dipankar Das ; Badal K. Mandal ; Tarit Roy Chowdhury ; Gautam Samanta ; Dipankar Chakraborti ( 1995 ). `` Arsenic in ground water in six districts of West Bengal, India : the biggest arsenic calamity in the world. Part I. Arsenic species in drinking water and urine of the affected people ''. Analyst. 120 ( 3 ) : 643 -- 651. doi : 10.1039 / AN9952000643. Jump up ^ Dipankar Das ; Amit Chatterjee ; Badal K. Mandal ; Gautam Samanta ; Dipankar Chakraborti ; Bhabatosh Chanda ( 1995 ). `` Arsenic in ground water in six districts of West Bengal, India : the biggest arsenic calamity in the world. Part 2. Arsenic concentration in drinking water, hair, nails, urine, skin - scale and liver tissue ( biopsy ) of the affected people ''. Analyst. 120 ( 3 ) : 917 -- 925. doi : 10.1039 / AN9952000917. PMID 7741255. Jump up ^ New Scientist, Interview : Drinking at the west 's toxic well 31 May 2006. ^ Jump up to : The Times of India, ' Use surface water. Stop digging ', interview, 26 September 2004. ^ Jump up to : World Health Organization, Arsenic in Drinking Water, accessed 5 February 2007. Jump up ^ Pierce, Brandon L. ; Maria Argos ; Yu Chen ; Stephanie Melkonian ; Faruque Parvez ; Tariqul Islam ; Alauddin Ahmed ; Rabiul Hasan ; Paul J. Rathouz ; Habibul Ahsan ( December 22, 2010 ). `` Arsenic Exposure, Dietary Patterns, and Skin Lesion Risk in Bangladesh : A Prospective Study ''. American Journal of Epidemiology. 173 : 345 -- 354. doi : 10.1093 / aje / kwq366. PMC 3105269. PMID 21178101. Jump up ^ `` Groundwater in 13 Districts of Bihar contaminated with Arsenic ''. Biharprabha News. Retrieved 25 September 2013. Jump up ^ Smedley P.L., Kinniburgh D.G., Macdonald D.M.J., Nicolli H.B., Barros A.J., Tullio J.O., Pearce J.M., Alonso M.S. ( 2005 ). `` Arsenic associations in sediments from the loess aquifer of La Pampa, Argentina ''. Applied Geochemistry. 20 : 989 -- 1016. doi : 10.1016 / j. apgeochem. 2004.10. 005. CS1 maint : Multiple names : authors list ( link ) Jump up ^ The history of arsenic regulation, Southwest Hydrology, May / June 2002, p. 16. Jump up ^ EPA announces arsenic standard for drinking water of 10 parts per billion, EPA press release, 10 / 31 / 2001. Jump up ^ Twarakavi, N.K.C. ; Kaluarachchi, J.J. ( 2006 ). `` Arsenic in the shallow ground waters of conterminous United States : assessment, health risks, and costs for MCL compliance ''. Journal of American Water Resources Association. 42 ( 2 ) : 275 -- 294. doi : 10.1111 / j. 1752 - 1688.2006. tb03838. x. Jump up ^ Bakalar, Nicholas ( 2017 - 10 - 24 ). `` Arsenic Reductions in Drinking Water Tied to Fewer Cancer Deaths ''. The New York Times. ISSN 0362 - 4331. Retrieved 2017 - 10 - 26. Jump up ^ Nigra, Anne E. ; Sanchez, Tiffany R. ; Nachman, Keeve E. ; Harvey, David E. ; Chillrud, Steven N. ; Graziano, Joseph H. ; Navas - Acien, Ana ( 2017 - 10 - 22 ). `` The effect of the Environmental Protection Agency maximum contaminant level on arsenic exposure in the USA from 2003 to 2014 : an analysis of the National Health and Nutrition Examination Survey ( NHANES ) ''. The Lancet Public Health. 0 ( 0 ). doi : 10.1016 / S2468 - 2667 ( 17 ) 30195 - 0. ISSN 2468 - 2667. Jump up ^ Alison Bohlen ( 2002 ) States move forward to meet new arsenic standard, Southwest Hydrology, May / June 2002, p. 18 - 19. Jump up ^ Megan A. Ferguson and others, Lowering the detection limit for arsenic : implications for a future practical quantitation limit, American Water Works Association Journal, Aug. 2007, p. 92 - 98. Jump up ^ John G. Shiber, `` Arsenic in domestic well water and health in Central Appalachia, USA '' Jump up ^ Frederick Rubel Jr. and Steven W. Hathaway ( 1985 ) Pilot Study for removal of arsenic from drinking water at the Fallon, Nevada, Naval Air Station, Environmental Protection Agency, EPA / 600 / S2 - 85 / 094. Jump up ^ M. Taqueer A. Qureshi ( 1995 ) Sources of Arsenic in the Verde River and Salt River Watersheds, Arizona, M.S. thesis, Arizona State University, Tempe. Jump up ^, Jaymie R. Meliker, Arsenic in drinking water and cerebrovascular disease, diabetes mellitus, and kidney disease in Michigan : a standardized mortality ratio analysis Environmental Health Magazine. Volume 2 : 4. 2007. Accessed 9 Sept. 2008. Jump up ^ http://southasia.oneworld.net/todaysheadlines/nepal-filters-to-provide-arsenic-free-drinking-water Jump up ^ Fatima Hashmi and Joshua M. Pearce, `` Viability of Small - Scale Arsenic - Contaminated Water Purification Technologies for Sustainable Development in Pakistan '', Sustainable Development, 19 ( 4 ), pp. 223 - 234, 2011. pdf Open access full text Jump up ^ `` Evaluation of Performance of Sono 3 - Kolshi Filter for Arsenic Removal from Groundwater Using Zero Valent Iron Through Laboratory and Field Studies '' ( PDF ). ( 272 KiB ) Jump up ^ `` SONO ARSENIC FILTER FROM BANGLADESH - 1 '' ( PDF ). ( 102 KiB ) - pictures with descriptions. Jump up ^ Newspaper article ( in Hungarian ) published by Magyar Nemzet on April 15, 2012. Jump up ^ SARKAR, S ; GUPTA, A ; BISWAS, R ; DEB, A ; GREENLEAF, J ; SENGUPTA, A ( 1 May 2005 ). `` Well - head arsenic removal units in remote villages of Indian subcontinent : Field results and performance evaluation ''. Water Research. 39 ( 10 ) : 2196 -- 2206. doi : 10.1016 / j. watres. 2005.04. 002. PMID 15913703. Jump up ^ 12 Cases of Cleanup & Success Jump up ^ `` World 's Worst Polluted Places Report 2009 '' Jump up ^ Scientific American Jump up ^ Reuters Global Jump up ^ Mustak Hossain ( 2006 - 07 - 13 ). `` Toxic rice harvested in southwestern Bangladesh ''. SciDev.Net. Jump up ^ Williams, P.N. ; Islam, M.R. ; Adomako, E.E. ; Raab, A. ; Hossain, S.A. ; Zhu, Y.G. ; Feldmann, J. ; Meharg, A.A. ( 2006 ). `` Increase in Rice Grain Arsenic for Regions of Bangladesh Irrigating Paddies with Elevated Arsenic in Groundwaters ''. Environ. Sci. Technol. 40 ( 16 ) : 4903 -- 4908. doi : 10.1021 / es060222i. PMID 16955884. Jump up ^ * Raghvan T. `` Screening of Rice Cultivars for Grain Arsenic Concentration and Speciation ''. American Society of Agronomy Proceeding. Further reading Nickson RT, McArthur JM, Ravenscroft P ( 2000 ). `` Mechanism of arsenic release to groundwater, Bangladesh and West Bengal ''. Applied Geochemistry. 15 ( 4 ) : 403 -- 413. doi : 10.1016 / S0883 - 2927 ( 99 ) 00086 - 4. Korte N.E. ; Fernando Q. ( 1991 ). `` A Review of Arsenic ( III ) in Groundwater ''. Critical Reviews in Environmental Control. 21 ( 1 ) : 1 -- 39. doi : 10.1080 / 10643389109388408. Smith AH, Lingas EO, Rahman M ( 2000 ). `` Contamination of drinking - water by arsenic in Bangladesh : a public health emergency ''. Bulletin of the World Health Organization. 78 ( 9 ) : 1093 -- 1103. doi : 10.1590 / S0042 - 96862000000900005. PMC 2560840. PMID 11019458. Harvey CF, Swartz CH, Badruzzaman AB ( 2002 ). `` Arsenic mobility and groundwater extraction in Bangladesh ''. Science. 298 ( 5598 ) : 1602 -- 1606. doi : 10.1126 / science. 1076978. PMID 12446905. Raghvan T. `` Screening of Rice Cultivars for Grain Arsenic Concentration and Speciation ''. American Society of Agronomy Proceeding. Hossain MF ( 2006 ). `` Arsenic contamination in Bangladesh - An overview ''. Agriculture, Ecosystems & Environment. 113 ( 1 -- 4 ) : 1 -- 16. doi : 10.1016 / j. agee. 2005.08. 034. External links ATSDR - Case Studies in Environmental Medicine : Arsenic Toxicity Arsenic in groundwater IGRAC International Groundwater Resources Assessment Centre Arsenic in Groundwater : A World Problem - IAH publication, Netherlands National Chapter, 2008 SOS-Arsenic.net - information and awareness raising site, focused on Bangladesh. Contamination of drinking - water by arsenic in Bangladesh : a public health emergency - at SOS-Arsenic.net Subterranean Arsenic Treatment Technology in West Bengal 12 Cases of Cleanup & Success www.wbphed.gov.in - Arsenic Scenario of West Bengal Drinking Death in Groundwater : Arsenic Contamination as a Threat to Water Security for Bangladesh, ACDIS Occasional Paper by Mustafa Moinuddin St Andrews Prize for Environment 2010 Food safety Adulterants, food contaminants 3 - MCPD Aldicarb Cyanide Formaldehyde Lead poisoning Melamine Mercury in fish Sudan I Flavorings Monosodium glutamate ( MSG ) Salt Sugar High - fructose corn syrup Microorganisms Botulism Campylobacter jejuni Clostridium perfringens Escherichia coli O104 : H4 Escherichia coli O157 : H7 Hepatitis A Hepatitis E Listeria Norovirus Rotavirus Salmonella Parasitic infections through food Amoebiasis Anisakiasis Cryptosporidiosis Cyclosporiasis Diphyllobothriasis Enterobiasis Fasciolopsiasis Fasciolosis Giardiasis Gnathostomiasis Paragonimiasis Toxoplasmosis Trichinosis Trichuriasis Pesticides Chlorpyrifos DDT Lindane Malathion Methamidophos Preservatives Benzoic acid Ethylenediaminetetraacetic acid ( EDTA ) Sodium benzoate Sugar substitutes Acesulfame potassium Aspartame Saccharin Sodium cyclamate Sorbitol Sucralose Toxins, poisons, environment pollution Aflatoxin Arsenic contamination of groundwater Benzene in soft drinks Bisphenol A Dieldrin Diethylstilbestrol Dioxin Mycotoxins Nonylphenol Shellfish poisoning Food contamination incidents Devon colic 1858 Bradford sweets poisoning 1989 Chilean grape scare 1993 Jack in the Box E. coli outbreak 1996 Odwalla E. coli outbreak 1999 Sun Orchard salmonellosis outbreak 2005 Indonesia food scare 2006 North American E. coli O157 : H7 outbreaks 2007 Vietnam food scare 2008 Canada listeriosis outbreak 2008 Chinese milk scandal 2008 Irish pork crisis 2008 United States salmonellosis outbreak 2011 Germany E. coli O104 : H4 outbreak 2011 Taiwan food scandal 2011 United States listeriosis outbreak 2013 European aflatoxin contamination 2013 horse meat scandal 2013 Taiwan food scandal 2014 Taiwan food scandal 2015 United States E. coli outbreak 2017 Brazil weak meat scandal Food safety incidents in China Foodborne illness outbreaks death toll United States ICA meat repackaging controversy Minamata disease StarLink corn recall Toxic oil syndrome Regulation, standards, watchdogs Acceptable daily intake E number Food labeling regulations Food libel laws International Food Safety Network ISO 22000 Quality Assurance International Institutions Centre for Food Safety European Food Safety Authority Institute for Food Safety and Health International Food Safety Network Ministry of Food and Drug Safety Retrieved from `` https://en.wikipedia.org/w/index.php?title=Arsenic_contamination_of_groundwater&oldid=808861452 '' Categories : Water pollution Water chemistry Aquifers Arsenic Hidden categories : CS1 maint : Multiple names : authors list All articles with unsourced statements Articles with unsourced statements from July 2013 Talk Contents About Wikipedia Edit links This page was last edited on 5 November 2017, at 17 : 38. 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Question: problem of water pollution with arsenic is maximum in which state of india
Answer: West Bengal