Meghan Hodges
Soil pollution is a serious environmental concern, posing a variety of health hazards to plants, animals, and humans. It occurs when soil contains enough toxic substances to threaten the health of organisms, plants, animals, humans, and the soil itself. Soil pollution is mainly caused by human activities, such as agricultural practices that use pesticides, herbicides, and chemical fertilizers, as well as industrial waste and radioactive emissions. These contaminants can infiltrate the soil, leading to adverse effects on the ecosystem and human health through direct contact, inhalation, or ingestion of polluted soil or contaminated food and water sources. While soil remediation methods exist, prevention is key, emphasizing the importance of sustainable waste management and responsible agricultural practices to minimize soil pollution and its detrimental consequences.
| Characteristics | Values |
|---|---|
| Cause | Human activities, natural processes |
| Human activities | Agricultural practices, industrial waste, urban waste, radioactive emissions, biological agents |
| Agricultural practices | Excessive/improper use of pesticides, herbicides, fungicides, and other hazardous farming chemicals |
| Industrial waste | Coke (coal) processing, vehicle emissions, cigarette smoke, shale oil extraction, pesticide manufacturing, waste incineration, petroleum hydrocarbon waste |
| Urban waste | Garbage, rubbish, dried sludge, sewage |
| Radioactive emissions | Radium, Thorium, Uranium, Nitrogen |
| Biological agents | Manure, digested sludge (human, bird, and animal excreta) |
| Natural processes | Accumulation of toxic chemicals, e.g. perchlorate accumulation in the Atacama Desert due to natural processes in arid environments |
| Effects | Adverse effects on plants, animals, humans, and the soil itself |
| Effects on humans | Health risks through direct contact (dermal exposure, inhalation, ingestion) or indirect contact (consuming contaminated plants or animals) |
| Specific health effects on humans | Increased risk of contracting leukaemia, kidney or liver damage, neurological problems, diseases of the central nervous system, immune system diseases, birth defects, depression, headaches, nausea, fatigue, eye irritation, skin rashes |
| Effects on plants | Hinders metabolism, reduced ability to absorb nutrients and perform photosynthesis, interferes with growth, kills beneficial microorganisms and fungi, leads to soil erosion |
| Effects on soil | Increased salinity, barrenness, reduced ability to weather changes in pH levels |
| Prevention and remediation | Sustainable soil management practices, environmentally friendly industrial processes, waste reduction, recycling and reuse, sustainable waste storage, soil remediation techniques |
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What You'll Learn
Using pesticides, herbicides, and fertilisers
Pesticides, herbicides, and fertilisers are all commonly used in agriculture to improve crop yields. However, they can also be a significant source of soil pollution if not used correctly. Here are some ways that these substances can contribute to soil pollution:
Pesticides
Pesticides are chemical poisons designed to kill pests that can harm crops. However, they can also be harmful to other organisms in the soil, including invertebrates such as earthworms and ants. These invertebrates are essential for maintaining soil health as they create tunnels and burrows that allow for the flow of nutrients, air, and water throughout the soil ecosystem. Pesticides can directly kill these invertebrates or affect their reproduction, growth, and overall species diversity. Therefore, the misuse or overuse of pesticides can degrade the soil and damage the community of organisms living in it. Some pesticides may also persist in the soil for long periods, especially in sandy or coarse-grained soils, and can leach through the soil to contaminate groundwater.
Herbicides
Herbicides are chemicals used to kill unwanted plants or weeds. Persistent herbicides, such as plant growth regulator (PGR) herbicides, can remain in the soil for long periods and cause herbicide injury to crops. They disrupt several plant growth processes, including cell division, respiration, and protein synthesis. Herbicide contamination can occur in home gardens, greenhouses, nurseries, and agricultural land, affecting a wide range of plant species. Compost and manure used as soil amendments can also be sources of herbicide contamination if they contain herbicide residues.
Fertilisers
Fertilisers are used to provide essential nutrients, such as nitrogen, phosphorus, and potassium, to crops. While fertilisers can improve soil fertility, their overuse can lead to soil pollution. Synthetic fertilisers, in particular, can have a significant environmental impact. The manufacturing process of synthetic fertilisers can release polluting gases, such as sulphur oxide (SOx), ammonia (NH3), and nitrogen oxides (NOx), which contribute to air pollution and the greenhouse effect. Excess nitrogen from fertilisers can also be washed from farm fields into waterways, leading to eutrophication and the creation of "dead zones" that decrease aquatic life. Proper application of fertilisers, including using the correct amount and timing, can help reduce their impact on the environment.
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Industrial waste and emissions
Release of Heavy Metals
Mining, smelting, and industrial waste disposal emit toxic heavy metals such as lead, mercury, cadmium, and arsenic. These metals have detrimental effects on soil organisms and plants, impeding their growth and disrupting nutrient absorption. Heavy metal contamination can persist in the soil for extended periods, accumulating in the food chain and posing hazards to human health when ingested through contaminated crops.
Chemical Contamination
Industrial activities often release chemicals into the environment, leading to soil contamination. This includes the use of pesticides, herbicides, and synthetic fertilizers in agriculture, as well as chemical processing and manufacturing operations. These chemicals can negatively impact soil health and fertility, affecting microbial activity and plant growth.
Petroleum Hydrocarbon Waste
The petroleum industry generates numerous hydrocarbon waste products, including carcinogenic substances such as benzene and methylbenzene. Spills and leaks of petroleum products, such as gasoline, diesel, and crude oil, can contaminate soil with toxic hydrocarbons.
Inadequate Waste Disposal
Improper disposal of industrial waste is a leading cause of soil pollution. This includes the dumping of hazardous industrial waste in non-designated areas, allowing toxic substances to seep into the soil. Additionally, the storage of toxic waste in landfills can result in the migration of pollutants into the soil and subsequent contamination of groundwater.
Emissions from Smelting Operations
Smelting operations, if not properly controlled, can release harmful emissions containing fluorine compounds. These emissions can have detrimental effects on the environment and human health. Copper smelters and steel plants, for example, have been associated with the release of PCDD/Fs, resulting in soil pollution and restrictions on grazing in surrounding areas.
It is important to note that while industrial activities contribute significantly to soil pollution, many responsible companies and governments are implementing measures to mitigate these impacts. This includes adopting sustainable practices, improving waste management, and enforcing stricter environmental regulations to reduce the release of harmful substances and protect soil health.
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Radioactive substances
Radioactive contamination, also known as radiological pollution, is the presence of radioactive substances in solids, liquids, gases, or biota, where they are not wanted or intended to be. This type of contamination is hazardous because the radioactive decay of these contaminants produces ionizing radiation, which can cause irreversible damage to tissues and organs in living organisms. Radioactive pollution is a significant threat to both human life and the ecosystem.
Radioactive contamination of soil can occur through human activities such as nuclear weapons testing, inadequate radioactive waste disposal practices, and accidents or incidents at nuclear power plants. The radioactive materials released in these incidents can have immediate harmful effects on plants, animals, and the environment. For example, the Fukushima nuclear accident in 2011 rendered large areas of farmland unusable for crop production.
The radionuclides released in these incidents can remain in the soil for extended periods, impacting both the soil and the wider environment. Radionuclides produced from the interaction of atmospheric gases with cosmic rays include 3H, 7,10Be, 14C, 26Al, and 39Ar. Additionally, rocks, minerals, and soil contain naturally occurring radioactive materials (NORM) with long half-lives, such as 238U and 232Th decay series, and 40K.
The remediation of radioactive soil contamination is challenging and often expensive. Some methods include removing and treating the soil with dispersing and chelating chemicals, or in situ stabilization by adding reactive materials to contain the contamination. Bioremediation is an emerging alternative approach, and the use of sunflowers as hyper-accumulators of certain radioactive isotopes like strontium and cesium is showing promise.
The monitoring and control of radioactive contamination are essential to minimize its impact on human health and the environment. This includes understanding the radionuclide distribution, mobility, and bioavailability, as well as the selection of appropriate remediation strategies.
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Natural causes
Soil pollution is mostly caused by human activities, but there are a few cases where natural processes can lead to an accumulation of toxic chemicals in the soil. Natural causes of soil pollution are rare, and they include:
Natural Accumulation of Toxic Chemicals
Some pollutants are naturally accumulated in soils due to differential deposition by the atmosphere. For example, compounds containing the perchlorate anion (ClO4–) can accumulate in dry, arid ecosystems, such as the Atacama Desert in Chile. This occurs when soil containing chlorine and certain metals is subjected to a thunderstorm.
Phytoremediation
Trees and other deep-rooted plants absorb contaminants from the soil and incorporate them into their tissues. They also "breathe" volatile contaminants, releasing them into the atmosphere where they dissipate. Phytoremediation is a process that uses plants as pumps to remove contaminants from the soil.
Biodegradation
Nature has its own way of eliminating soil contaminants through a process called biodegradation. Certain microorganisms in the soil feed on contaminants such as tar deposits. This natural process can be accelerated by injecting zero-valent iron, the elemental form of iron, into the soil.
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Poor waste management
Improper Waste Disposal
The disposal of waste in open and unsanitary landfills is a common practice, especially in developing countries. This method of waste disposal leads to the contamination of soil, water, and air. Uncontrolled dumping, open-air incineration, and the use of old-generation facilities are all unsustainable practices that contribute to soil pollution. These methods often result in the release of toxic substances, such as heavy metals and persistent organic pollutants, into the soil, causing long-term environmental damage.
Mixing of Hazardous Waste
Inadequate solid waste management systems often lead to the mixing of household and commercial garbage with hazardous waste during storage and handling. This hazardous waste can include electronic waste, industrial by-products, and agricultural waste. When this mixed waste is disposed of, the hazardous components can leach into the soil, contaminating it with toxic chemicals and heavy metals.
Ineffective Waste Collection
Poor waste collection systems, including non-existent or irregular collection services, result in waste accumulation and improper disposal. This leads to environmental pollution, as waste is often burned or dumped in open spaces. The open burning of waste releases pollutants into the air, which then settle back onto the land, contaminating the soil. Additionally, the lack of proper waste collection can lead to the blockage of water drains, causing flooding and the creation of standing waters that breed diseases like cholera, malaria, and dengue.
Lack of Waste Minimization and Recycling
The minimization of waste generation and the promotion of recycling are essential for reducing soil pollution. However, in many cases, waste reduction strategies are inadequate, and recycling rates are low. For example, in 2019, only 17% of electronic waste was properly collected and recycled. The improper management of electronic waste exposes toxic chemicals and heavy metals, which can leach into the soil, leading to soil pollution and posing significant health risks to nearby communities.
Industrial Waste Discharge
The discharge of industrial waste into the soil is a direct form of soil pollution. Industrial activities generate various hazardous by-products, including xenobiotics (synthetic chemicals not found in nature) and polycyclic aromatic hydrocarbons (PAHs). When these wastes are improperly disposed of or treated, they contaminate the soil, leading to the presence of toxic substances that adversely affect human health and the environment.
Soil pollution due to poor waste management practices poses significant risks to ecosystems and human health. It is crucial to address these issues through improved waste management strategies, sustainable practices, and the implementation of environmentally friendly industrial processes to reduce the impact on soil quality and the health of communities worldwide.
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Frequently asked questions
You can pollute soil through your daily activities in a number of ways, including:
- Using pesticides, herbicides, and fertilisers on your garden or crops.
- Driving a car, as vehicle emissions can cause soil pollution.
- Smoking cigarettes, as these can also contribute to soil pollution.
Industries can pollute the soil through:
- The discharge of industrial waste, including hazardous materials and obsolete pesticides.
- Coke (coal) processing.
- The extraction of shale oil.
- Inappropriate waste management.
Some of the most harmful ways to pollute soil include:
- Increasing soil salinity, making it barren and unable to support plant life.
- Causing soil acidity, which harms beneficial microorganisms and leads to soil erosion.
- Introducing heavy metals such as lead and mercury, which can cause irreversible developmental problems in children.
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