Hydrogeochemical controls on arsenic mobility in an arid inland basin, Southeast of Iran: the role of alkaline conditions and salt water intrusion
Article
Article Title | Hydrogeochemical controls on arsenic mobility in an arid inland basin, Southeast of Iran: the role of alkaline conditions and salt water intrusion |
---|---|
ERA Journal ID | 5823 |
Article Category | Article |
Authors | Dehbandi, Reza (Author), Abbasnejad, Ahmad (Author), Karimi, Zohreh (Author), Herath, Indika (Author) and Bundschuh, Jochen (Author) |
Journal Title | Environmental Pollution |
Journal Citation | 249, pp. 910-922 |
Number of Pages | 13 |
Year | 2019 |
Publisher | Elsevier |
Place of Publication | Oxford, United Kingdom |
ISSN | 0269-7491 |
1873-6424 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.envpol.2019.03.082 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S0269749118349376 |
Abstract | Elevated inorganic arsenic concentrations in groundwater has become a major public and environmental health concern in different parts of the world. Currently, As-contaminated groundwater issue in many countries and regions is a major topic for publications at global level. However, there are many regions worldwide where the problem has still not been resolved or fully understood due to inadequate hydrogeochemical investigations. Hence, this study evaluates for the first time the hydrogeochemical behavior of the arid and previously unexplored inland basin of Sirjan Plain, south east (SE) Iran, in order to assess the controlling factors which influence arsenic (As) mobility and its distribution through groundwater resources. Total inorganic arsenic concentration was measured using inductive-coupled plasma optical emission spectrometry (ICP-OES). Arsenic content in groundwater of this region ranged between 2.4 and 545.8 μg/L (mean value: 86.6 μg/L) and 50% of the samples exceeded the World Health Organization (WHO) guideline value of 10 μg/L in drinking water. Groundwater was mainly of Na-Cl type and alkaline due to silicate weathering, ion exchange and evaporation in arid conditions. Elevated As concentrations were generally observed under weakly alkaline to alkaline conditions (pH > 7.4). Multivariate statistical analysis including cluster analysis and bi-plot grouped As with pH and HCO3 and demonstrated that the secondary minerals including oxyhydroxides of Fe are the main source of As in groundwater in this region. The desorption of As from these mineral phases occurs under alkaline conditions in oxidizing arid environments thereby leading to high levels of As in groundwater. Moreover, evaporation, ion exchange and saltwater intrusion were the secondary processes accelerating As release and its mobility in groundwater. Based on the results of this study, desorption of As from metal oxy-hydroxides surfaces under alkaline conditions, evaporation and intrusion of As-rich saline water are considered to be the major factors causing As enrichment in arid inland basins such as those in southeast Iran. This study proposes the regular monitoring and proper groundwater management practices to mitigate high levels of arsenic in groundwater and related drinking water wells of Sirjan Plain. |
Keywords | geogenic arsenic, environmental impact, agriculture, Sirjan Plain, desorption, evaporation, salt water intrusion |
ANZSRC Field of Research 2020 | 410402. Environmental assessment and monitoring |
410699. Soil sciences not elsewhere classified | |
410404. Environmental management | |
300201. Agricultural hydrology | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Mazandaran University of Medical Sciences, Iran |
University of Kerman, Iran | |
School of Civil Engineering and Surveying | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q599w/hydrogeochemical-controls-on-arsenic-mobility-in-an-arid-inland-basin-southeast-of-iran-the-role-of-alkaline-conditions-and-salt-water-intrusion
155
total views8
total downloads0
views this month0
downloads this month