1. Introduction. Arsenic in aquifers may have a serious impact on human health. When the arsenic concentration in the groundwater exceeds the World Health Organization (WHO) provisional guideline value for drinking water (10 μg/L), it can be considered as excessive arsenic in groundwater.

Groundwater wells in the Amman-Wadi Es Sir Aquifer (B2/A7) throughout Jordan are investigated for their arsenic (As) and element-by-element geochemical behavior. Groundwater wells are found to have total arsenic concentrations above the recommended levels designated by the Jordanian drinking water standard, the …

The occurrences of elevated Mn groundwater have often been discovered with high arsenic (As) groundwater and high iron (Fe) groundwater ... Hydrogeochemical evidences for targeting sources of safe groundwater supply in arsenic-affected multi-level aquifer systems. The Science of the Total Environment, 645 (2018), pp. 1159-1171.

The variability of the arsenic concentration in groundwater is ascribed to the arsenic content of the aquifer and the varying dissolution ... The optimized adsorbent demonstrates the highest reported adsorption capacity while keeping the residual arsenic level below 10 mg/L (Q10-value) and maintaining its superiority in column investigations …

Water level and geochemistry of unconfined/updip and confined/downdip parts of the Edwards aquifer, Central Texas, respond differently to rainfall/recharge events and multiyear dry/wet cycles. ...

Groundwater contaminated with naturally occurring arsenic is a widespread problem affecting many alluvial and deltaic aquifer systems throughout the world. The human health toll from consuming groundwater with high levels of arsenic is staggering in its proportions. Furthermore, the use of arsenic contaminated groundwater for irrigation …

22 May 2020. Vol 368, Issue 6493. pp. 845 - 850. DOI: 10.1126/science.aba1510. Dowsing for danger. Arsenic is a metabolic …

Physicochemical parameters and arsenic, iron, and ion concentrations were measured in groundwater from wells reaching 23–82 m deep, revealing arsenic …

A regional assessment of untreated groundwater in the Glacial aquifer system, ... The trace elements manganese, arsenic and strontium were detected at high levels in groundwater in about 24 percent of the study area. The nutrient nitrate, which has both natural and human-related sources, was detected at high concentrations in …

Higher groundwater arsenic levels during the dry season were also found in low-lying areas of the middle Mediterranean basin, such as rhyolite volcanic areas of Lesvos Island, Greece (Table S6). The oxic condition of the aquifer increased the sorption of arsenate to Fe/Mn oxides (Zkeri et al., 2015, 2017). Moreover, these low-lying areas …

Arsenic Contamination in Groundwater: Geochemical Basis of Treatment Technologies. Sushil R. Kanel*, Tonoy K. Das., Rajender S. Varma., Sudarshan Kurwadkar., Sudip …

The redox conditions of groundwater strongly affect the mobility and persistence of many contaminants in groundwater. Redox conditions determine whether some chemical constituents, like arsenic and manganese, are released from the aquifer rocks and sediments into the groundwater. Redox conditions also determine whether …

Average arsenic concentrations in river water (4.27 μg/L) are much lower than in average arsenic concentrations in groundwater (92.4 μg/L), which indicates arsenic mobilization occurs along the flow path into or within the aquifer and is not being transported from the river water itself.

The USGS annually monitors groundwater levels in thousands of wells in the United States. Groundwater level data are collected and stored as either discrete field-water-level measurements or as continuous time-series data from automated recorders. Data from some of the continuous record stations are relayed to USGS offices nationwide through …

In a previous study in the valley, James found that lifetime exposure to low levels of inorganic arsenic in drinking water, between 10 and 100 micrograms per liter, or µg/L, was linked to a ...

Other hydrogeological factors, including age of groundwater and aquifer, historical and current hydraulic gradient, degree of flushing, and climate, contribute to create conditions where As is released to groundwater (Smedley and Kinniburgh, 2002).One key hydrogeological factor that has been shown to result in high-As groundwater on a …

Vulnerability of deep groundwater in the Bengal Aquifer System to contamination by arsenic . W. G. Burgess, M. A. Hoque, H. A. Michael, C. I. Voss, G. N. Breit & K. M. Ahmed ... Arsenic levels in ...

The groundwater quality in a multi-level aquifer system can be influenced not only by geochemical processes, but also by inter-layer hydrodynamic exchange (Hsu et al., 2010 ... Near-surface wetland sediments as a source of arsenic release to ground water in Asia. Nature, 454 (2008), pp. 505-509. CrossRef View in Scopus Google …

1. Introduction. Arsenic (As) is a toxic metalloid commonly found in groundwater in many regions of the world. Bangladesh, India, and China are known to have some of the most seriously As-affected groundwaters (Ahmad et al., 2017; Cromeans et al., 2005; Polizzotto et al., 2008).In China, elevated As in groundwater occurs mainly …

Groundwater arsenic concentrations further inland are dependent on local hydrology, which influences the source of recharge and the connectivity with the river; the depositional environment and geomorphology, which influence arsenic levels in the recharge water; and the inland aquifer material, which controls the level of additional …

Arsenic levels exceeding 10 μg/L are present in hundreds of private supply wells distributed over ten counties in eastern and southeastern Michigan. Most of these wells are completed in the Mississippian Marshall Sandstone, the principal bedrock aquifer in the region, or in Pleistocene glacial or Pennsylvanian bedrock aquifers. About 70% of …

The primary source of As is natural, derived mainly from the interactions between groundwater and aquifer sediments and hard rocks of minerals, particularly …

At Jianghan Plain of central Yangtze basins where the health of > 73, 000 people has been affected by long term intake of high arsenic groundwater, over 100 sediment samples from four boreholes at the field monitoring sites were collected and analyzed to delineate the distribution and speciation of As in the shallow aquifer …

Small concentrations of arsenic occur naturally in nearly all rocks in the aquifer (Mosier, 1998), but only some areas show elevated concentrations (greater than 10 µg/L) in the water of the aquifer ().Concentrations as great as 232 µg/L have been measured in the confined part of the aquifer in Norman (figs. 2 and 3).In other parts of …

Highlights. •. Proportions of high arsenic groundwater increased with proximity to paleochannels. •. Redox sensitive components changed temporally evidently …

Arsenic, of particular importance due to its carcinogenicity, is present in elevated concentrations in groundwater in many regions; more than 5% of 6000 …

Moreover, natural contaminants such as arsenic that may be released from sandy aquifers can play an important role. Among natural contaminates in groundwater, arsenic in sedimentary aquifers has been extensively investigated (Ahmed et al., 2004, Bone et al., 2006, Wang et al., 2012). Arsenic is a ubiquitous element in the …

Arsenic concentrations in aquifers of S–SE Asia often span several orders of magnitude (~1 to >1000 μg L −1) over very small spatial scales (10–100 m). 9–14 Measurements of groundwater As are preferred to characterize exposure levels directly, but are exceedingly difficult to make for the millions of new wells installed ...

Groundwater arsenic contamination occurs in generally oxidizing conditions in the High Plains and limited data indicate that arsenic is in the form of arsenate. Groundwater arsenic concentrations were compared with concentrations of other ions to evaluate potential arsenic sources. Correlations between arsenic and other constituents …

The natural, or geogenic, occurrence of arsenic in groundwater is a global problem with wide-ranging health effects for humans and wildlife. Because it is toxic and does not serve any beneficial metabolic function, inorganic arsenic (the species present in groundwater) can lead to disorders of the skin and vascular and nervous systems, as …

Here we find that recent groundwater pumping, observed through land subsidence, results in an increase in aquifer arsenic concentrations in the San Joaquin Valley of California. By comparison ...

In the San Joaquin Valley of California, approximately 1 million people rely on groundwater for drinking. This high reliance on groundwater has resulted in overpumping of this resource, which leads to subsidence, or massive compression of the ground and arsenic contamination of the water. Arsenic is deadly to human health; therefore, it is imperative …

Groundwater pumping can increase arsenic levels in irrigation and drinking water. Date: June 5, 2018. Source: Stanford University. Summary: Pumping an aquifer to the last drop squeezes out more ...

Conversely, the bedrock aquifer may receive water from the overlying glacial aquifer, with high arsenic concentrations in the older, deeper aquifer becoming diluted by younger, shallower water that is lower in arsenic. Groundwater in the bedrock and overburden aquifers has been shown to be hydraulically connected in similar settings …

In California and Vietnam, research has linked rising arsenic levels in drinking water to land subsidence — when the ground sinks due to aquifer overpumping, which happens more during drought.

In this study, reducing conditions were exported from the small, sulfidic, organic-rich, clay lenses into the initially oxic aquifer sand. This promoted toxic levels of arsenic release to groundwater in the aquifer sand, effectively recruiting a much larger volume of aquifer to function as reducing arsenic-thiolating zones.

Temporal variation of (a) antimony and (b) arsenic concentrations of groundwater sampled from different aquifers in 2013–2017. The green, blue and red shapes represent groundwater from aquifers of C 1 y 3, D 3 x 4 and D 3 s 2, respectively. (For interpretation of the references to colour in this figure legend, the reader is referred …

Nature Reviews Earth & Environment - The use of groundwater with high levels of geogenic contaminants, such as arsenic, has caused severe health impacts …

Elevated levels of arsenic (As) have been reported in groundwater from sandy aquifer systems in the Mannar Island, located in the northwest of Sri Lanka. As a result of serious health concerns, this study aims to investigate groundwater aquifers in order to trace the different As sources and mechanisms involved in its release from …