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Journal Article 
A survey of arsenic, manganese, boron, thorium, and other toxic metals in the groundwater of a West Bengal, India neighbourhood 
Bacquart, T; Bradshaw, K; Frisbie, S; Mitchell, E; Springston, G; Defelice, J; Dustin, H; Sarkar, B 
In Press 
ISSN: 1756-5901
EISSN: 1756-591X 
Around 150 million people are at risk from arsenic-contaminated groundwater in India and Bangladesh. Multiple metal analysis in Bangladesh has found other toxic elements above the World Health Organization (WHO) health-based drinking water guidelines which significantly increases the number of people at risk due to drinking groundwater. In this study, drinking water samples from the Bongaon area (North 24 Parganas district, West Bengal, India) were analyzed for multiple metal contamination in order to evaluate groundwater quality on the neighbourhood scale. Each sample was analyzed for arsenic (As), boron (B), barium (Ba), chromium (Cr), manganese (Mn), molybdenum (Mo), nickel (Ni), lead (Pb), and uranium (U). Arsenic was found above the WHO health-based drinking water guideline in 50% of these tubewells. Mn and B were found at significant concentrations in 19% and 6% of these tubewells, respectively. The maps of As, Mn, and B concentrations suggest that approximately 75% of this area has no safe tubewells. The concentrations of As, Mn, B, and many other toxic elements are independent of each other. The concentrations of Pb and U were not found above WHO health-based drinking water guidelines but they were statistically related to each other (p-value = 0.001). An analysis of selected isotopes in the Uranium, Actinium, and Thorium Radioactive Decay Series revealed the presence of thorium (Th) in 31% of these tubewells. This discovery of Th, which does not have a WHO health-based drinking water guideline, is a potential public health challenge. In sum, the widespread presence and independent distribution of other metals besides As must be taken into consideration for drinking water remediation strategies involving well switching or home-scale water treatment. 
• Arsenic Hazard ID
     1. Initial Lit Search
     4. Considered through Oct 2015
     6. Cluster Filter through Oct 2015
• Arsenic (Inorganic)
     1. Literature
          Toxline, TSCATS, & DART
          Web of Science
     5. Susceptibility Screening
          Excluded/Not relevant
• Arsenic Susceptibility
     1. Susceptibility Literature Screening
          Keyword Search
     2. Excluded
          Not Relevant
• Uranium
     Merged reference set
     Secondary Refinement
          Retained for manual screening
     Additional Resource
          Risk assessments
     Uranium Update 3/2017