Crusher

Over the past 30 years, we have successfully established production experience of various types of cone crushers, mills, sand making machines and other equipment, which will help you solve various problems.!

View all Services

Arsenic in Illinois Groundwater - solidwaste.epa.state.il.us

What are the Sources of Arsenic in Illinois Groundwater? Arsenic is a naturally occurring element in the earth's crust. Arsenic is found in the deep ... the samples had arsenic levels of 50 ... aquifers and groundwater chemistry that promote high arsenic concentrations.

Groundwater Arsenic Contamination Throughout China | Science

The solubility of arsenic in groundwater aquifers is controlled by a number of hydrologic and geochemical factors. In rural communities that rely on groundwater for drinking water, the risk from exposure may pose a public health threat, especially when groundwater pumping can increase arsenic solubility. In an effort to provide a focused assessment of risk to arsenic exposure from groundwater ...

Arsenic and Drinking Water - USGS.gov

In a national study of groundwater quality, the USGS found that arsenic was detected in nearly half of the wells sampled in parts of aquifers used for drinking-water supply at a concentration of 1 µg/L or greater. Detections were more common and concentrations generally were higher in the west than in the east. About 7 percent of the wells sampled contained arsenic at a concentration that ...

Another Danger from Overpumping Groundwater: Arsenic | KQED

Jun 05, 2018· San Joaquin Valley in early spring. A new study finds that groundwater pumping in California's San Joaquin Valley, which has caused it to sink overtime, unleashes hazardous levels of arsenic, a known carcinogen, into aquifers that supply drinking water and …

Arsenic in Groundwater Poses Ongoing Challenge | wrrc ...

Aquifers in the Southwest United States are highly vulnerable to arsenic contamination due to geologic and climate conditions. Low precipitation rates and high evapotranspiration translate into slow aquifer recharge, and prolonged contact with arsenic-bearing aquifer materials allows dissolved arsenic in groundwater to reach high concentrations.

Groundwater pumping can increase arsenic levels in ...

Jun 05, 2018· Groundwater pumping can increase arsenic levels in irrigation and drinking water Date: June 5, 2018 Source: Stanford University Summary: Pumping an aquifer …

Assessment of Arsenic in Groundwater and Water Supply ...

distribution of elevated groundwater arsenic levels include (1) An arsenic source (2) A process for mobilizing arsenic into groundwater (3) Low recharge rates limited arsenic flushing in aquifers Previous studies have identified important factors for delineating aquifer vulnerability to arsenic contamination (Smedley et al., 2002). Environments ...

Confirmation of elevated arsenic levels in groundwater of ...

Apr 15, 2014· Millions of villagers across South and Southeast Asia are exposed to toxic levels of arsenic (As) by drinking well water. In order to confirm field-kit results that Myanmar is also affected, a total of 55 wells were tested in the field in January 2013 and sampled for laboratory analysis across seven villages spanning a range of As contamination in the lower Ayeyarwady basin.

Clay layers and distant pumping trigger arsenic ...

May 07, 2020· While the geochemical conditions surrounding every aquifer are different, the problem of arsenic and other contaminants leaking into deep aquifer groundwater is not unique to Dhaka.

Evaluation of Arsenic Contamination in Texas

D1-3.1 Arsenic Distribution in the High Plains Aquifers.....35 D1-3.2 Arsenic Distribution in the Gulf Coast Aquifers .....36 Subtask D2. Evaluate Geologic Sources of Arsenic by Comparing Groundwater Arsenic Concentrations with Concentrations

Overpumping groundwater increases contamination risk ...

Jun 05, 2018· June 5, 2018 Stanford researchers find groundwater pumping can increase arsenic levels in irrigation and drinking water. Pumping an aquifer to …

Arsenic Interactive Map for the Aquia and Piney Point aquifers

Arsenic Interactive Map for the Aquia and Piney Point aquifers Return to Groundwater Quality In 2006 the U.S. Environmental Protection Agency lowered the Maximum Contaminant Level for arsenic from 50 to 10 μg/L for public-water systems and newly constructed domestic wells.

Groundwater Arsenic Contamination | Bureau of Economic Geology

Regional analyses of groundwater arsenic concentrations do not support a surfical source of arsenic contamination. Arsenic concentrations are not correlated with land use, cotton production (arsenic acid used for defoliating cotton), distance from cotton gins, nitrate concentrations, water table depth, or aquifer saturated thickness.

Retardation of arsenic transport through a Pleistocene aquifer

Sep 12, 2013· Groundwater drawn daily from shallow alluvial sands by millions of wells over large areas of South and Southeast Asia exposes an estimated population of over 100 million to toxic levels of arsenic ().Holocene aquifers are the source of widespread arsenic poisoning across the region (2, 3).In contrast, Pleistocene sands deposited in this region more than ~12,000 years ago mostly do not host ...

Clay Layers and Distant Pumping Trigger Arsenic ...

May 07, 2020· Indeed, the researchers found that the recent changes in arsenic near Dhaka were the result of pumping from deeper aquifers to satisfy the municipal supply of the city. Because of this deep municipal pumping, water levels under Dhaka itself are a hundred meters below what they would naturally be — the aquifer just doesn't refill fast enough.

Arsenic in Ground Water in Lapeer County, Michigan

Arsenic is a common, naturally-occurring element in the Earth's crust. Arsenic in ground water is often a result of arsenic-bearing minerals dissolving naturally over time. Historical well-water data for southeastern Michigan indicated that where arsenic concentrations of ground water were elevated, wells were commonly, though not exclusively,

Texas A&M Research: Clay Layers Exacerbate Arsenic ...

Jun 02, 2020· Groundwater is a precious resource worldwide, especially in communities where surface water is scarce or contaminated. Clay layers are widely thought to protect these valuable groundwater aquifers from above-ground pollutants and contaminants. But new research recently published in …

Arsenic contamination of Bangladesh aquifers exacerbated ...

In the context of groundwater arsenic in Bangladesh, we challenge this notion here by showing that organic carbon drawn from a clay layer into a low-arsenic pre-Holocene (>12 kyr-old) aquifer ...

Metals and Other Trace Elements - USGS.gov

Metals reported to widely occur at concentrations above drinking-water benchmarks in untreated groundwater from some aquifers include manganese and the metalloid arsenic. Other metals, like iron, might not be present at levels that are a health risk, but can be a nuisance by making water unpleasant to drink or by staining fixtures .

Arsenic levels in groundwater aquifer

comparison of water quality at the aquifer. Varying levels of arsenic in both industrial and sanitary waters were determined, indicating water pollution with arsenic compounds. The horizontal electromagnetic prospecting method was used to define the extent of the arsenic-polluted zone and pollution direction.

Arsenic contamination of groundwater - Wikipedia

Arsenic in groundwater is a concern because it is a known carcinogen and can cause skin damage or problems with human circulatory systems. In light of these concerns, the U.S. Environmental Protection Agency (USEPA) established a maximum contaminant level (MCL) of 10 micrograms per liter (USEPA, 2013) for drinking water.

Researchers create global arsenic-in-groundwater maps to ...

May 22, 2020· A pair of researchers at the Swiss Federal Institute of Aquatic Science and Technology has created a global map that highlights areas where there are likely dangerous levels of arsenic in groundwater.

Overpumping leads to California groundwater arsenic threat ...

In addition, overpumping an aquifer system has been noted to increase the arsenic levels in Southeast Asia by drawing arsenic from less-permeable anaerobic clay strata into the aquifer 7. Arsenic ...

Arsenic in Drinking Water - Idaho Department of ...

Map of Arsenic Levels in the United States; Arsenic is a problem in some parts of Idaho. Data compiled by the Idaho Department of Water Resources show that concentrations of arsenic in ground water are highest in the southwestern counties of Elmore, Gem, Owyhee, and Washington; in Kootenai County in northern Idaho; and Jefferson County in ...

Hydrogeochemical and isotopic evaluation of groundwater ...

59% of groundwater samples exceeded the WHO permissible limit of 10 μg/L for As. • Groundwater isotopic composition indicated meteoric origin of groundwater recharge. • Evaporative controls in addition to competitive desorption reactions are mainly controlling high arsenic levels in groundwater.

Origin of arsenic in Bangladesh groundwater

Twenty years ago, Smith and colleagues described groundwater arsenic (As) contamination in Bangladesh as the "largest mass poisoning of a population in history." An estimated 60 million people were unknowingly drinking groundwater containing dangerous concentrations of naturally occurring As. Today, despite a much-improved well water testing effort, an estimated 30–35 million are still ...

Arsenic Contamination in Groundwater Influenced by Natural ...

However, NOM in groundwater contains more complex carbon sources, such as plant-derived organic matter, amino acids, and carbohydrates. Andreas Kappler and colleagues wanted to study how NOM from actual aquifer sediments near the village of Van Phuc, Vietnam (where groundwater is contaminated with high levels of arsenic), influenced arsenic ...

Arsenic Levels Linked to Aquifer Overdraft | Fluence

Jun 28, 2018· In a recent study, researchers used satellite data to establish a link between excessive pumping from California aquifers and dangerous arsenic concentration spikes in the groundwater of the Tulare Basin. This promises to be an important early warning system for the growing problem of arsenic contamination, which potentially threatens drinking water for more than a million people.

Contact Us

GCM Industrial Technology Group Co., Ltd. sincerely welcomes you to contact us through hotline and other instant communication methods, whether it is project consultation or feedback.

  • Address:

    No.416 Jianye Road, South Jinqiao Area,Pudong New Area, Shanghai, China.

  • Phone No:

    +86-21-58386189, 58386176

  • Email Address:

    [email protected]