Brian Barton
Soil pollution is a critical environmental issue that poses significant risks to human health and food security. It occurs when the levels of natural soil contaminants are increased by human activity, such as through industrial waste, agricultural practices, and improper waste disposal. These activities introduce toxic chemicals, heavy metals, pesticides, herbicides, and radioactive substances into the soil, which can have detrimental effects on plant life, animals, and humans. The consequences of soil pollution include reduced crop yields, unsafe food for consumption, and various short-term and long-term ailments in humans, such as nausea, vomiting, chest pain, and skin irritation, and an increased risk of cancer. With the growing awareness of soil pollution and its impact, global efforts are being made to address this hidden threat to our ecosystem and wellbeing.
| Characteristics | Values |
|---|---|
| Human Activities | Agricultural practices, Urban or industrial waste, Radioactive emissions, Industrial activities, Accidental spills, Improper disposal of waste, Corrosion of underground storage tanks, Mining, Foundry activities, Construction activities, Vehicle exhaust, Incineration of coal, Alkali and metal processing, Medical waste, Volcanic activity, Industrial waste, Sewage, Nuclear waste, E-waste, Coal ash, Pesticides, Herbicides, Insecticides, Fungicides, Lead paint |
| Natural Causes | Rocks containing large amounts of toxic elements, Atmospheric compounds, Precipitation water, Wind activity, Surface water bodies, Shallow groundwater |
| Effects | Soil contamination, Water pollution, Environmental concerns, Health hazards, Congenital disorders, Decrease in the availability of nutrients, Threat to food security, Reduced crop yields, Infiltration of soil contamination into groundwater aquifers |
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What You'll Learn
Industrial waste
The improper disposal of toxic and hazardous waste can have major health and safety implications. For example, hazardous by-products from industries, farms, and hospitals can create health and safety issues if not managed properly. Heavy metals, such as lead, in soil can disrupt the food chain and negatively impact human health. Lead exposure, especially in children, can cause permanent damage to the nervous system.
The main sources of soil pollution from industrial sources include mining and quarrying, manufacturing, energy production, construction facilities, and transportation. Mining activities have been a potential source of pollution for thousands of years, not just from the mining operation itself but also from waste and emissions during the processing of extracted materials. Industrial processes, including mining and manufacturing, have historically been leading causes of soil pollution, with industrial areas typically having much higher levels of trace elements and organic contaminants.
Industrial accidents and legacy issues from abandoned industrial sites also contribute to soil pollution. Intentional and unintentional releases from industrial processes can directly contaminate the soil, water bodies, and the atmosphere. While many responsible industrial companies attempt to mitigate the risks of their operations, there are still current industrial operations that routinely contribute to soil pollution, especially in developing countries.
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Agricultural practices
Fertilizers are also commonly used to improve soil fertility and increase crop yield. Nitrogen fertilizers, in particular, have been associated with negative impacts on groundwater, surface waters, and the atmosphere. When nitrogen and other nutrients from fertilizers are not fully utilized by plants, they can be lost from farm fields and negatively impact water quality and the environment. This can lead to eutrophication of water bodies, causing "dead zones" and a decrease in aquatic life.
Livestock operations and manure management also play a role in agricultural soil pollution. Manure contains nutrients such as nitrogen and phosphorus, which can contaminate soil and water if not properly managed. Implementing conservation tillage practices, such as reducing the frequency and intensity of tilling, can help improve soil health and reduce erosion and runoff.
Soil erosion and sedimentation caused by inefficient land management and farming practices contribute to agricultural pollution. The topmost layer of soil, which is crucial for farming and grazing, is left vulnerable to erosion, leading to a decline in fertility. The eroded soil ends up in waterways and surrounding fields, disrupting the natural movement of water, nutrients, and aquatic life.
Genetically Modified Organisms (GMOs) and inefficient animal digestive systems can also contribute to agricultural pollution. GMOs can alter the ecosystem by introducing new diseases, pests, and invasive species that local vegetation and wildlife are unable to withstand. Inefficient animal digestion, particularly in pigs, can lead to elevated levels of phosphorus in the soil, contributing to pollution.
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Urban and domestic waste
Sewage and wastewater from urban areas also fall under this category and can contaminate soil if not treated and disposed of correctly. Treated sewage sludge, or biosolids, has become a controversial topic as it is often sprayed onto land as fertiliser. While it has good agricultural properties due to its high nitrogen and phosphate content, there are concerns about the accumulation of heavy metals in the topsoil and the potential for pathogenic microorganisms to enter watercourses.
Another concern is the presence of lead in urban soils, which is largely associated with the historical use of lead-based paints and transport emissions. Lead is highly toxic, and there is no known safe level of exposure. Even in countries where lead has been banned, the legacy of its use persists, and it continues to contaminate soil in urban areas.
The proliferation of plastic waste is another pressing issue. Plastic waste discarded in rivers and oceans breaks down into microplastics, which are then carried by wind or water onto land, contributing to soil pollution. In addition, the open burning or uncontrolled incineration of solid waste releases pollutants into the atmosphere, causing respiratory issues and contributing to air pollution.
To address these issues, effective waste management strategies are essential. This includes reliable waste collection services, proper waste separation, and the implementation of circular practices that emphasise reuse, recycling, and regeneration to minimise environmental impacts.
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Radioactive substances
Radioactive contamination, also known as radiological pollution, refers to the unintended or undesirable deposition of radioactive substances on surfaces or within solids, liquids, or gases (including the human body). This contamination is hazardous because the radioactive decay of the contaminants produces ionizing radiation in the form of alpha, beta, gamma rays, and free neutrons. The degree of hazard depends on the concentration of the contaminants, the energy and type of radiation, and the proximity of the contamination to the body.
Radioactive contamination can occur through accidental releases, nuclear weapons testing, and improper radioactive waste disposal practices. The Fukushima nuclear accident in Japan in 2011 is an example of a large-scale radioactive contamination event, leading to the displacement of 110,000 people. The Japanese government is working to decontaminate the area by removing the key radioisotope caesium-137, which poses a significant health threat.
To prevent the spread of radioactive contamination, various techniques are employed, such as using high-integrity tanks for liquids and gloveboxes for materials that are likely to become airborne. Additionally, contamination control products, such as fixatives, strippable coatings, and decontamination gels, are used to minimize and fix contamination on surfaces and equipment.
The presence of radioactive substances in the soil can have detrimental effects on human health, agriculture, and the ecosystem. It can lead to an increase in congenital disorders, central nervous system issues, organ damage, and the risk of developing cancer. Soil pollution also decreases the availability of nutrients, hindering plant growth and impacting the surrounding environment.
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Herbicides and insecticides
Herbicides are used to kill weeds, especially on pavements and railways. While some herbicides are biodegradable by soil bacteria, others are not and can persist in the environment for long periods. They are toxic and can cause diseases and even death. For example, Paraquat is highly toxic and can cause fatality, although it rapidly degrades in the soil and does not kill soil fauna. Another herbicide derived from trinitrotoluene (2:4 D and 2:4:5 T) contains the impurity dioxin, which is very toxic and causes fatality even in low concentrations. Herbicides can cause genetic damage, diverse physiological alterations, and even death in exposed organisms. They can also reduce the activity and reproduction of earthworms and lead to increased soil nutrient concentrations.
Insecticides are used to rid farms of pests that damage crops. The first insecticides used in the nineteenth century were inorganic, such as Paris Green and other compounds of arsenic. Nicotine has been used as an insecticide since 1690. Insecticides have been shown to have hazardous effects on bumble bees foraging on flowering white clover in turf. Insecticides, along with other chemical control mechanisms, have been identified as a major driving factor in the loss of soil biodiversity. For example, the increased use of neonicotinoid insecticides has resulted in a significant increase in oral and contact toxicity load for insects in agricultural environments.
The overuse and misuse of pesticides, which include herbicides and insecticides, can degrade the soil and damage the community of organisms living in it. Some pesticides are more toxic to soil organisms than others and may persist in the soil for longer periods, especially in sandy or course-grained soils where they are more likely to contaminate groundwater. Pesticides may also be taken up by plant roots and moved to other plant tissues, including fruit.
In addition to herbicides and insecticides, other sources of soil pollution include lead paint, mining, foundry activities, vehicle exhaust, construction activities, agricultural activities, incineration of coal, alkali and metal processing, medical waste, volcanoes and geologic deposits, and accumulation in plants and vegetables grown on polluted soils.
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Frequently asked questions
Soil pollution is mainly caused by man-made contaminants, which can be organic or inorganic. These contaminants can pollute the soil alone or in combination with natural soil contaminants. The main sources of man-made soil pollution are:
- Industrial waste
- Agricultural pesticides
- Urban or industrial waste
- Radioactive emissions
Soil pollution can have several adverse effects on human health. Some of the short-term effects of exposure to polluted soil include headaches, nausea, vomiting, coughing, chest pain, wheezing, skin and eye irritation, and fatigue. Soil pollution has also been linked to various long-term diseases, including permanent damage to the nervous system, depression of the CNS (Central Nervous System), damage to vital organs, and a higher risk of developing cancer.
Soil pollution can reduce crop yields and make crops unsafe for consumption by animals and humans. It can also lead to the emergence of new pests and diseases by altering the balance of ecosystems. Additionally, since children are more susceptible to diseases, polluted soil poses a greater threat to them.
