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Title: Arsenic in the groundwater of Majulithe largest river Island of the Brahmaputra: prevalence, exposure impacts and removal using a novel nano adsorbent
Researcher: Goswami, Ritusmita
Guide(s): Sarma, K P
Deb, P
Keywords: Environment Science
largest river
novel nano adsorbent
Upload Date: 20-May-2013
University: Tezpur University
Completed Date: 2011
Abstract: Arsenic has recently become a matter of great concern due to the increased knowledge of its toxicological and carcinogenic effects on human health, causing the guideline value to be lowered from 100 µg/L to 50 µg/L and further to 10 µg/L by WHO (World Health Organization). As the source of arsenic is the Himalayan mountain and the Tibet Plateau, the flood plains of all the rivers that originated from those sources are expected to be arsenic contaminated. It is anticipated that, the groundwater As contamination is from the deposition of newer alluvium (Holocene) sediment. Groundwater of Majuli island in Assam on this basis is expected to be arsenic contaminated. Therefore, in the present study an attempt has been made to gain an understanding about the As contamination status and the health risk of the people in Majuli- the largest river island of the Brahmaputra, Assam by investigating the water and sediment chemistry as well as the urine, hair and nail of the people who are drinking arsenic contaminated water. The subsequent removal study of arsenic from highly contaminated water of Majuli island has also been undertaken in the study. In the present study, surveys have been conducted in Majuli to understand the magnitude of contamination. Total 380 tube-well water samples were analyzed for arsenic (by FI-HG-AAS). Of the total groundwater samples analyzed, 37.6 % of samples exceeded 10 and#61549;g/L (WHO limit), 14% contained gt50 and#61549;g/L (maximum arsenic concentration recorded was 468 µg/L). The relation between the depth of the tubewell and arsenic concentration has also been studied. Depth information of 303 tubewells from the Majuli island out of 380 analyzed samples, 77% of those tubewells are shallow tubewells in the depth range up to 15 m and it appears that in the Majuli island arsenic concentration gradually decreased beyond 25 m depth with few exceptions. Tube-well water samples were also analyzed for iron (n=319) and found elevated iron content (minimum=36 and#61549;g/L and maximum=22000).
Pagination: xxi, 174p.
Appears in Departments:Department of Environmental Science

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01_title.pdfAttached File88.95 kBAdobe PDFView/Open
02_dedication.pdf10.27 kBAdobe PDFView/Open
03_abstract.pdf25.97 kBAdobe PDFView/Open
04_declaration.pdf51.76 kBAdobe PDFView/Open
05_certificates.pdf68.13 kBAdobe PDFView/Open
06_acknowledgements.pdf14.99 kBAdobe PDFView/Open
07_contents.pdf28.13 kBAdobe PDFView/Open
08_list of tables.pdf58.07 kBAdobe PDFView/Open
09_list of figures.pdf59.07 kBAdobe PDFView/Open
10_abbreviations.pdf12.24 kBAdobe PDFView/Open
11_notations.pdf10.11 kBAdobe PDFView/Open
12_chapter 1.pdf73.47 kBAdobe PDFView/Open
13_chapter 2.pdf476.46 kBAdobe PDFView/Open
14_chapter 3.pdf1.3 MBAdobe PDFView/Open
15_chapter 4.pdf2.43 MBAdobe PDFView/Open
16_chapter 5.pdf497.89 kBAdobe PDFView/Open
17_chapter 6.pdf133.6 kBAdobe PDFView/Open
18_chapter 7.pdf41.04 kBAdobe PDFView/Open
19_references.pdf165.87 kBAdobe PDFView/Open

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