Bronte Wells
Arsenic pollution is a significant environmental issue, with serious health consequences for humans. Arsenic is a naturally occurring metalloid, widely distributed in the Earth's crust and found in the air, water, and land. It is a known carcinogen, with links to skin, lung, bladder, kidney, and liver cancers, as well as other health issues such as cardiovascular disease and diabetes. Arsenic pollution can come from both natural and anthropogenic sources, with human activities such as mining, industry, agriculture, and the use of arsenic in products like pesticides and wood preservatives contributing to its release into the environment. Arsenic enters the air, water, and land through various mechanisms, including wind-blown dust, runoff, and leaching from minerals. The greatest threat to public health is through contaminated groundwater used for drinking, food preparation, and irrigation, with certain regions of the world, including the United States, Argentina, Bangladesh, and China facing high levels of arsenic in their water supplies.
| Characteristics | Values |
|---|---|
| Arsenic pollution sources | Natural and anthropogenic sources |
| Arsenic compounds | Arsenite (As3+), arsenate (As5+), dimethylarsinate (DMA), monomethylarsonate (MMA) |
| Arsenic in drinking water | A problem because it is toxic at low levels and is a known carcinogen |
| USEPA MCL for arsenic in public water supplies | 10 micrograms per liter (µg/L) |
| Arsenic in food | Found in rice, fish, chicken, fruit juice, shellfish, meat, poultry, dairy products, and cereals |
| Arsenic in the environment | Air pollution, contaminated soil, dust, or wood preserved with arsenic |
| Health effects of arsenic exposure | Skin lesions, skin cancer, liver disease, heart disease, digestive issues, nervous system complications, neurotoxicity, cancer |
| Arsenic in groundwater | Naturally present in high levels in several countries, including Argentina, Bangladesh, Cambodia, Chile, China, India, Mexico, Pakistan, the United States, and Vietnam |
| Factors affecting arsenic concentrations in groundwater | Groundwater residence times, rock type, high pH, arid climate, irrigation practices |
| Treatment for arsenic poisoning | Chelation therapy, bowel irrigation, oxygen therapy, fluid management, blood transfusion, heart medication, seizure control |
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What You'll Learn
Arsenic in drinking water
Arsenic is a naturally occurring metalloid that is toxic at low levels and is a known carcinogen. It is tasteless, colourless, and odourless, making it hard to detect without testing. Arsenic is a natural component of the earth's crust and is widely distributed throughout the environment in the air, water, and land. It occurs as a constituent in more than 200 minerals, although it primarily exists as arsenopyrite and as a constituent in several other sulfide minerals.
Arsenic compounds may occur naturally in soil and rock, but they also arise from agriculture and industrial processes, such as mining, smelting, and manufacturing. Arsenic enters the air, water, and land from wind-blown dust, runoff, and leaching. It can also be released into groundwater as a result of human activities, such as mining, and from its various uses in industry, in animal feed, as a wood preservative, and as a pesticide.
The introduction of arsenic into drinking water occurs as a result of its natural geological presence in local bedrock. Arsenic-containing bedrock formations are known in Bangladesh, West Bengal (India), and regions of China, and many cases of endemic contamination by arsenic with serious consequences for human health are known from these areas. Arsenic in drinking water is considered one of the most significant environmental causes of cancer in the world. Long-term exposure to inorganic arsenic, mainly through drinking water and food, can lead to chronic arsenic poisoning, causing skin lesions and skin cancer. It has also been associated with cardiovascular disease, diabetes, liver disease, heart disease, digestive system issues, and nervous system complications.
In 2001, the USEPA lowered the MCL for arsenic in public water supplies to 10 micrograms per liter (µg/L) from 50 µg/L. The USGS plays an active role in protecting human health from potential issues related to natural resources by assessing the water quality of groundwater supplies. The USGS has analysed water samples from more than 5,000 wells across the United States and determined that at least 7% of the wells had arsenic levels above the current EPA standard of 10 ppb. In some areas of the world, including the United States, high levels of arsenic occur in drinking water due to arsenic that is naturally present in the ground leaching into the water supply.
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Arsenic in food
Arsenic is a naturally occurring element that is widely distributed throughout the environment in the air, water, and land. It is a heavy metal that is toxic to humans, particularly in its inorganic form. While it is impossible to avoid arsenic completely, it is important to minimise exposure to it as much as possible due to its harmful effects on human health.
One of the primary sources of arsenic exposure is through contaminated drinking water. Arsenic can leach into water supplies from natural sources in the ground, such as rocks and sediments, or as a result of human activities such as mining, industrial processes, and agricultural practices like the use of pesticides and fertilisers. In some areas, such as the United States and Bangladesh, high levels of arsenic have been found in drinking water, potentially exposing millions of people to health risks.
In addition to drinking water, arsenic can also contaminate food crops, especially when irrigated with contaminated water. Cereals, particularly brown rice, have been found to contain high levels of arsenic due to the cultivation method of submerging seedlings in water. Other foods that may be contaminated with arsenic include vegetables, fish, milk, cheese, meat, poultry, and coffee. Seafood such as fish and shellfish tend to contain organic arsenic compounds, which are less toxic and not linked to cancer.
The European Food Safety Authority (EFSA) has warned that prolonged intake of arsenic can lead to serious health problems, including dermatological diseases, skin lesions, cardiovascular diseases, metabolic and nervous system disorders, and even some forms of cancer. To reduce arsenic exposure from food, the Food and Agriculture Organization of the United Nations (FAO) recommends alternative cultivation methods for rice, as well as limiting rice consumption, especially for young children. Proper washing and rinsing of rice before and after cooking can also help reduce arsenic content.
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Arsenic in the air
Arsenic is a naturally occurring metalloid that is widely dispersed in the Earth's crust. It is present in the air, water, and land and can enter the atmosphere through wind-blown dust. Arsenic is also released into the air through industrial processes, such as mining, smelting, and manufacturing. In addition, the burning of coal in certain regions, including Slovakia, Turkey, and China, contributes to arsenic pollution in the air.
The presence of arsenic in the air is a concern due to its toxicity, particularly in its inorganic form. While oral ingestion of contaminated water and food is the primary route of arsenic exposure for the general population, inhalation of arsenic particles in the air can also lead to arsenic poisoning. This is a significant risk for individuals working in industries that utilise arsenic, such as pesticide production and certain types of mining.
Inhalation of arsenic-contaminated air has been linked to various adverse health effects. Chronic exposure to arsenic through inhalation has been associated with hyperpigmentation, keratosis, and vascular issues. Additionally, arsenic is a known carcinogen, with long-term exposure increasing the risk of developing lung, skin, bladder, kidney, and liver cancers.
The health risks associated with arsenic exposure have led to increased efforts in monitoring and mitigating arsenic pollution. For example, the U.S. Geological Survey (USGS) actively assesses water quality and helps local health officials manage water resources to reduce arsenic exposure through drinking water. Additionally, the U.S. Food and Drug Administration (FDA) monitors and regulates arsenic levels in certain foods, particularly those frequently consumed by children, such as infant rice cereal and apple juice.
While arsenic is a natural component of the environment, human activities can exacerbate arsenic pollution. Mining and industrial processes that release arsenic into the air and water contribute to the contamination of groundwater and surface water sources. Therefore, implementing measures to reduce arsenic emissions and improve water treatment processes is crucial to minimise the health risks associated with arsenic exposure.
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Arsenic in soil
Arsenic is a natural component of the earth's crust and is widely distributed throughout the environment in the air, water, and land. It is present in the soil due to both natural and anthropogenic processes. Inorganic arsenic compounds may occur naturally in soil and rock, but they are also a result of agriculture and industrial processes such as mining, smelting, and manufacturing. Arsenic can enter the soil from wind-blown dust, runoff, and leaching. It can also be released into the soil as a result of human activities, such as the use of arsenic in pesticides and animal feed.
Arsenic is highly toxic in its inorganic form and poses a significant threat to public health. Long-term exposure to inorganic arsenic, mainly through drinking water and food, can lead to chronic arsenic poisoning and various adverse health effects. Skin lesions and skin cancer are the most characteristic impacts of arsenic exposure. It has also been associated with cardiovascular disease, diabetes, liver disease, digestive issues, and neurotoxicity. In utero and early childhood exposure has been linked to impaired cognitive development and increased mortality rates in young adults.
The presence of arsenic in the soil can lead to its accumulation in plants and crops. Gardeners and children are particularly vulnerable to arsenic exposure by ingesting soil particles, eating vegetables grown in contaminated soil, or handling and breathing in contaminated soil. Rice, for example, is known to take up higher amounts of arsenic from the soil. However, it's important to note that garden-related arsenic exposure is likely to be a small portion of a person's overall arsenic exposure.
To reduce the risks associated with arsenic in the soil, several precautionary measures can be taken. Maintaining a neutral soil pH of around 7 can help limit the bioavailability of arsenic. Removing any CCA-treated wood from the garden and opting for untreated wood or non-leaching materials can also minimize arsenic exposure. Additionally, conducting soil safety training and implementing exposure reduction strategies for all garden users is essential. While there is no official "safe" level of arsenic exposure from soil for the general population, it is crucial to limit and reduce arsenic exposure as much as possible.
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Arsenic in industry
Arsenic is a metalloid and one of the pnictogens, sharing many properties with phosphorus and antimony. It is the 20th most abundant component of the Earth's crust and is widely distributed in rocks, soils, water, air, and biological materials. It is also found as an impurity in metallic ores and other mineral deposits.
Arsenic has a variety of industrial applications, although its use has declined due to the recognition of its toxicity. It is used as an alloying agent in lead and metal alloys, as well as in the processing of glass, pigments, textiles, paper, metal adhesives, and ammunition. Arsenic is also employed in the hide tanning process and, to a limited extent, in pesticides, feed additives, and pharmaceuticals. It is critical in defense applications, telecommunications, and light-emitting diodes (LEDs). The electronics industry uses arsenic to create gallium-arsenic semiconductors for cell phones, solar panels, and aerospace research.
Historically, one of the most extensive industrial uses of arsenic was in wood treatment with chromated copper arsenate (CCA). CCA was widely used in consumer products, particularly in the United States and Europe, until its ban in 2004 due to its toxicity. However, CCA remains heavily utilized in other countries, such as on Malaysian rubber plantations. Arsenic was also prevalent in agricultural insecticides, with lead hydrogen arsenate being a common choice until it was replaced by less toxic organic forms of arsenic in the 20th century.
The release of arsenic into the environment can occur through industrial emissions, runoff from industrial plants, and various industrial processes such as mining, smelting, and manufacturing. Arsenic can enter the air and land through wind-blown dust and contaminate groundwater through runoff and leaching.
The greatest threat to public health from arsenic is through contaminated drinking water, food preparation, and irrigation of food crops. Long-term exposure to arsenic has been linked to various health issues, including cancer, skin lesions, cardiovascular disease, and diabetes.
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Frequently asked questions
Arsenic occurs naturally in the Earth's crust and is widely distributed throughout the environment in the air, water and land. Arsenic pollution in water can occur as a result of its natural geological presence in local bedrock. Arsenic-containing bedrock formations are known in Bangladesh, West Bengal (India), and regions of China. Arsenic can also be released into groundwater as a result of human activities, such as mining, and from its various uses in industry, in animal feed, as a wood preservative, and as a pesticide.
Arsenic may be found in foods, including rice, chicken, fruit juice, and some fish, due to its presence in the soil or water. Arsenic can enter the food chain through crops irrigated with contaminated water. Fish and shellfish contain organic arsenic compounds, which are much less toxic than inorganic compounds.
Arsenic can enter the air from wind-blown dust, as well as from industrial processes and the burning of coal. Arsenic is also released into the air from smoking cigarettes and the use of cosmetics.
