This thesis takes a combined socio-hydrologic approach to managing problems of groundwater contamination. Groundwater flow and transport modeling and the economics of remediation are considered here. This thesis presents two illustrative examples. The first example considers the…
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Groundwater is used in Terai region of Nepal as a major source of drinking water since surface water is vulnerable to microbial contamination. But the presence of arsenic, a toxic element in groundwater poses a threat to human health and environment. Arsenic in groundwater is a …
A field, laboratory, and modeling study of As in groundwater discharging to Waquoit Bay, MA, shed light on coupled control of chemistry and hydrology on reactive transport of As in a coastal aquifer. Precipitation of Fe(III) oxides, along with oxidation and adsorption of As occu…
Arsenic(As), one of most toxic contaminants found in water, is well known to have adverse effects on human health, such as skin cancer. The consumption of arsenic contaminated water has led to human health crises in many countries such as Bangladesh, China and even the western U…
In rural Bangladesh people drink water from an estimated 10-11 million tube wells, many with arsenic concentrations well above the national standard of 50μg/L. Characteristic skin lesions and more serious health effects are probable. The research reported here was designed to de…
This thesis is an examination of the geochemical and hydrological processes controlling the arsenic concentrations in shallow aquifers in Araihazar, Bangladesh. The relationship between dissolved arsenic and the oxidation state of the leachable fraction of iron oxyhydroxide sedi…
Background. Millions worldwide are being exposed to arsenic through drinking water, which is associated with increased risks of skin cancer. Results from experimental research have found that dietary protein and specific amino acids may assist with arsenic methylation and conseq…
The mechanisms of arsenic’s atherogenicity, toxicity and carcinogenicity remain to be elucidated. The lung is an established target of arsenic exposure. Therefore, the present studies address the effects of arsenic on the lung and examine the role of arsenic induced oxidative st…
Exposure to arsenic (As)-contaminated drinking water affects tens of millions people worldwide. The health effects of As are well established yet the mechanisms and dose-response relationships of As toxicity are not fully understood. Inaccurate exposure assessment, limited sensi…
Arsenic is a highly toxic and ubiquitous metalloid dispersed throughout the earth's crust. It can be mobilized in the environment through a combination of natural processes. The mobilization of arsenic from aquifer materials usually occurs under reducing conditions and is microb…
The objectives of this dissertation are to: (1) assess the validity of a food frequency questionnaire (FFQ) designed for the Health Effects of Arsenic Longitudinal Study (HEALS); (2) examine the associations between intakes of major dietary factors, dietary patterns and blood pr…
Arsenic contamination in drinking water sources is one of the major health concern in the human history. Throughout this study, inorganic arsenic removal using commercially available iron-based porous adsorbents has been studied. A large number of iron oxide/hydroxide based adso…