Why Are There High Concentrations Of Arsenic In Granites

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Why are there high concentrations of arsenic in granites. As long as the arsenic remains bound in the granite it causes no problems to people. The high concentration of as in granite pegmatites is consistent with the incompatibility of as in major granitic minerals. After absorption into the blood stream arsenic is rapidly transformed and eliminated from the body via urine. Arsenic concentrations from 20 450 domestic wells in the u s.

Aquifers in the southwest united states are highly vulnerable to arsenic contamination due to geologic and climate conditions. Were used to develop a logistic regression model of the probability of having arsenic 10 μg l high arsenic which is presented at the county state and national scales. If a bedrock well is installed at a location that intercepts groundwater containing relatively high concentrations of arsenic and or uranium then arsenic and or uranium withdrawn from the well may exceed the public drinking water standards. In many regions of the world arsenic is used as a pathfinder in gold exploration by tracking increasing concentrations of arsenic in water until the arsenic source and gold source are discovered.

Concentrations of the less toxic organic arsenic are particularly high in sea living animals and therefore in seafood. Estimating the high arsenic domestic well population in the conterminous united states. Screening of wells has continued and it has been estimated that 5 6 million people are exposed to high concentrations of arsenic in drinking water 50 μg liter 1 and that some 14 7 million are exposed to arsenic concentrations of 10 μg liter 1. Arsenic and pegmatite formation.

Some volcanic regions have exhibited elevated naturally occurring arsenic within basalts obsidian and granite aquifers. Through natural processes arsenic and uranium can leave the rock and enter the groundwater in the bedrock. But in certain conditions natural weathering of the granite occurs and the arsenic is released into the ground water. A 2007 study found that over 137 million people in more.

Arsenic contamination of groundwater is a form of groundwater pollution which is often due to naturally occurring high concentrations of arsenic in deeper levels of groundwater it is a high profile problem due to the use of deep tubewells for water supply in the ganges delta causing serious arsenic poisoning to large numbers of people. 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.