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Environmental pollution is a widely discussed topic with air, water, and soil being polluted in today’s rapidly progressing society. Soil, being a “universal sink,” is significantly at risk of the effects of environmental pollution. Soil pollution occurs when chemicals or substances which are not naturally present are found in soil or when naturally occurring compounds and materials are present but in abnormally high concentrations. Because soil pollution cannot be visually perceived or directly assessed, it poses a significant threat to soil fertility and productivity. Hence, the urgency in controlling soil pollution.
The soil is the outer layer of the earth’s crust composed of organic and inorganic materials. It is the basis of agriculture that supports the growth of rooted plants and crops for human and animal consumption. Due to soil pollution, food security is greatly affected due to the presence of toxic levels of contaminants resulting in a reduction in crop yield and with crops deemed unsafe for human and animal consumption.
Assessment of soil to identify contaminants present is a difficult task nowadays due to the evolution of these contaminants caused by agrochemical and industrial innovations. In addition, the soil is often on private lands, unlike aquatic and gaseous environments, making ecological risk assessment relatively challenging. That is why soil pollution is becoming an alarming issue. It has been identified as the third most crucial threat to soil function in Eurasia and Europe, fourth in North Africa, fifth in Asia, seventh in Northwest Pacific, eighth in North America, and ninth in Latin America. In order to determine the full extent of soil pollution and contamination, an environmental characterization study is necessary.
Exposure Route from Soil to Human Intake
There are three main routes where soil can directly enter the body: inhalation, eating, or through skin contact.
Inhalation
This route mostly affects people, like workers, who are continually working with soil or those who reside nearby such areas. These types of environments have fine dust particles floating around, which can be inhaled and eventually absorbed by the body.
Eating
Adults consume soil through accidental ingestion. An example of this is when the ingested food, like vegetables, still has some soil attached to it. However, in some parts of the world, the soil is deliberately consumed due to cultural reasons.
On the other hand, children, especially those under the age of three, are at high risk for soil contamination exposure as they tend to eat soil while playing outdoors. In addition, their biological makeup is more likely to absorb more of the toxic chemicals than that of an adult.
Skin Contact
Also known as “dermal absorption” or “cutaneous absorption,” this route is most applicable to volatile organic compounds. However, some heavy metals do cause skin contact problems.
Understanding Indirect Contact with Soil Pollution and Its Risks
This occurs when soil contaminants transfer from the soil to surface water contaminating the drinking water. Aside from that, the contaminated water may also be absorbed by plants and, in turn, contaminating the said plant, which may be consumed by livestock or humans, thereby allowing the contaminants to enter the human food chain [4].
Indirect consumption of these contaminants becomes dangerous when it accumulates in the body resulting in abnormally high levels, exhausting the body’s natural detoxification system. When this happens, the body cannot rid itself of the contaminants, which result in adverse effects on the tissues and organs that are affected [4].
Soil Contamination
Direct Application
This happens through the use of pesticides, herbicides and fertilizers, domestic and industrial waste disposal through land burial, use of sewage sludge to agricultural lands, chronic discharge from motor vehicles like oil leaks, and accidental discharges or spills from storage tanks or transportation of toxic substances.
Deposition
Particulates from the atmosphere get mixed into the soil through dry deposition, wet deposition, or gas partitioning. Dry deposition occurs when particulate matter, or the contaminant, settles out of the atmosphere and onto plant and soil surfaces. Wet deposition is when the pollutants attached to airborne particles get washed off to the soil by rain or snow. Gas partitioning happens when contaminants diffuse out from the air and diffuse into the ground.
Contaminated Water Use
Irrigating farmlands, lawns, or gardens with contaminated water supplies can result in the accumulation of contaminants in the soil.
Internal Contamination
The source of contamination can also be the soil itself. Internal contamination happens when biological organisms naturally present in the soil produce toxic chemical byproducts or are health-threatening themselves.
Soil Contaminants
Discussed below are the most common pollutants of the soil. The categories listed below are according to the Food and Agriculture Organization of the United Nations (FAO) [1].
Heavy Metals and Metalloids
Heavy metals and metalloids are those that have a relatively high atomic mass. These include lead (Pb), cadmium (Cd), mercury (Hg), strontium (Sn), and zinc (Zn). There are also non-metals considered together with heavy metals: arsenic (As), Antimony (Sb), and selenium (Se). They are naturally present in soils and are essential micronutrients for plants, animals, and humans.
Pesticides
These include but are not limited to herbicides, insecticides, fungicides, nematicides, molluscicides, rodenticides, and plant growth regulators. They are applied to crops to prevent losses due to pests, pathogens, and weeds.
Polycyclic Aromatic Hydrocarbons (PAHs)
PAHs are a group of semi-volatile organic pollutants that have low water solubility and slow mass-transfer rates from solid, causing them to be retained in the soil for more extended periods of time. The most prevalent PAHs are benzopyrene, pyrene, naphthalene, anthracene, fluoranthene, and phenanthrene.
Persistent Organic Pollutants (POPs)
These are organic, hydrophobic, lipophilic substances that bioaccumulate through the food chain and pose adverse effects on human health and the environment. Examples include polychlorinated biphenyls (PCBs) and organochlorine pesticides such as DDT.
Radionuclides
The most common radionuclides found in soil are the following: 137Cs, 40K, 90Sr, 232Th, 238U.
Emerging Pollutants (EPs)
EPs are chemicals, natural or synthetic, that have recently appeared in the environment and are not usually monitored. These chemicals may be from pharmaceuticals, hormones and toxins, biological pollutants like bacteria and viruses, and endocrine disruptors.
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Water, known as the “universal solvent,” can dissolve a majority of substances compared to other liquids on earth. Because of this unique property, it is vulnerable to water pollution as toxic substances can easily dissolve and mix with water. When harmful substances such as chemicals or microorganisms get dissolved, it
How does soil pollution impact on ecosystems and biodiversity?
Soil pollution significantly impacts ecosystems and biodiversity by degrading soil quality, harming plant growth, and disrupting food chains. Contaminated soil can lead to loss of habitat, reduced species diversity, and increased vulnerability of ecosystems to diseases and climate change.
What are the primary causes of soil pollution in urban areas?
The primary causes of soil pollution in urban areas include industrial waste, improper disposal of household chemicals, excessive use of fertilizers and pesticides, and contamination from construction activities. These factors contribute significantly to soil degradation and environmental concerns.
Can soil pollution affect human health directly?
Soil pollution can directly affect human health by exposing individuals to harmful contaminants that can be absorbed through skin contact, ingestion, or inhalation, leading to various health issues and diseases.
What are the consequences of soil pollution on ecosystems?
The consequences of soil pollution on ecosystems are significant and detrimental. Soil contamination disrupts plant growth, affects animal habitats, and leads to a decline in biodiversity, ultimately compromising the overall health of the ecosystem.
What is the impact of soil pollution on biodiversity?
The impact of soil pollution on biodiversity is significant; it disrupts ecosystems, harms plant and animal life, and reduces species diversity by contaminating habitats and altering food chains. This ultimately threatens the balance of natural environments.
What are the consequences of soil pollution on food security?
The consequences of soil pollution on food security include decreased agricultural productivity, contamination of crops, and increased health risks to consumers. This ultimately threatens access to safe, nutritious food and disrupts local food systems.
What are the human health risks associated with soil pollution?
The human health risks associated with soil pollution include exposure to toxic substances, which can lead to respiratory issues, skin conditions, and long-term diseases such as cancer. Contaminated soil can affect food safety and water quality, posing additional health threats.
How does soil pollution impact plant growth and development?
Soil pollution negatively impacts plant growth and development by introducing harmful pollutants that can hinder nutrient absorption, reduce soil fertility, and disrupt the biological processes essential for healthy plant life. This can lead to stunted growth and diminished crop yields.
What are the long-term effects of soil pollution?
The long-term effects of soil pollution include diminished soil fertility, disrupted ecosystems, and health hazards to humans through contaminated food and water sources. These impacts can lead to persistent environmental degradation and increased economic costs for remediation efforts.
What are the effects of soil pollution on human health?
The effects of soil pollution on human health are significant and concerning. Contaminated soil can expose individuals to harmful chemicals and pathogens, leading to various health issues, including respiratory problems, skin diseases, and even serious conditions like cancer or neurological disorders.
How does soil pollution alter ecosystem dynamics?
Soil pollution alters ecosystem dynamics by disrupting nutrient cycling, harming flora and fauna, and reducing biodiversity. Contaminants can inhibit plant growth and soil microbiota, leading to imbalanced ecosystems and diminished ecological resilience.
What factors contribute to urban soil contamination?
The factors that contribute to urban soil contamination include industrial activities, improper waste disposal, agricultural runoff, and urban infrastructure development. These elements introduce various pollutants that adversely affect soil quality and human health.
In what ways can soil pollution harm humans?
Soil pollution can harm humans in several ways, primarily through the ingestion of contaminated food, direct contact with polluted soil, and the inhalation of toxic dust. These exposure routes can lead to various health issues, including respiratory problems and long-term illnesses.
How does soil pollution disrupt food chains?
Soil pollution disrupts food chains by introducing harmful toxins that accumulate in plants and animals. As these pollutants move up the food chain, they can lead to bioaccumulation and biomagnification, ultimately impacting human health and ecosystem stability.
What effects does soil pollution have on wildlife?
The effects of soil pollution on wildlife are significant and detrimental. Contaminated soil can lead to habitat destruction, reduced food sources, and toxic exposure, ultimately threatening the health and survival of various species within affected ecosystems.
How can soil pollution influence crop yields?
Soil pollution can significantly influence crop yields by contaminating the soil with harmful substances, which can hinder plant growth, reduce nutrient uptake, and ultimately lead to lower agricultural productivity.
What symptoms indicate health issues from soil pollution?
Symptoms indicating health issues from soil pollution include respiratory problems, skin irritations, gastrointestinal disorders, headaches, and neurological effects. Prolonged exposure may lead to chronic conditions, highlighting the importance of monitoring and addressing soil contamination.
What relationship exists between soil pollution and climate change?
The relationship between soil pollution and climate change lies in how contaminated soils can release greenhouse gases and impair ecosystem services, ultimately exacerbating climate issues. Addressing soil pollution is crucial for mitigating climate change effects.
How does soil pollution interfere with groundwater safety?
Soil pollution significantly interferes with groundwater safety by allowing toxic substances to seep through the soil layers, contaminating aquifers and water sources. This poses serious health risks to humans and ecosystems reliant on clean water.
What role do heavy metals play in soil pollution?
Heavy metals significantly contribute to soil pollution by contaminating the soil and affecting its quality and fertility. These toxic elements can accumulate in the food chain, posing serious health risks to humans and the environment.
What methods are effective in preventing soil pollution?
Effective methods in preventing soil pollution include implementing proper waste disposal practices, using environmentally friendly agricultural techniques, controlling industrial emissions, and conducting regular soil monitoring to identify and mitigate potential contaminants.
How do landfills contribute to soil contamination?
Landfills contribute to soil contamination primarily through leachate, which is a toxic liquid formed when rainwater seeps through waste materials. This leachate can introduce harmful chemicals and pollutants into the surrounding soil, posing risks to human health and the environment.
What strategies can mitigate soil pollutions effects?
Strategies to mitigate the effects of soil pollution include implementing sustainable agricultural practices, restoring contaminated areas through remediation techniques, and enforcing strict regulations on industrial waste disposal. These actions help protect human health and the environment.
How does organic farming address soil pollution?
Organic farming addresses soil pollution by using natural fertilizers and crop rotation, which enhance soil health and biodiversity, reducing harmful chemicals and pollutants. This sustainable practice promotes a cleaner environment and preserves soil quality for future generations.
What regulations exist to control soil pollution?
Regulations to control soil pollution include the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), the Resource Conservation and Recovery Act (RCRA), and various state-level regulations. These laws aim to identify, manage, and remediate contaminated sites to protect human health and the environment.
How do urban development practices impact soil health?
Urban development practices significantly impact soil health by leading to soil compaction, reduced organic matter, and contamination from pollutants. These changes can hinder soil's natural functions, affecting its ability to support plant growth and maintain ecosystem balance.
What role does education play in preventing soil pollution?
Education plays a crucial role in preventing soil pollution by raising awareness about its causes and impacts. By informing communities and stakeholders about sustainable practices and proper waste management, education empowers individuals to make environmentally responsible decisions, ultimately leading to healthier soils.
How can community initiatives reduce soil contamination?
Community initiatives can significantly reduce soil contamination by promoting sustainable practices, organizing clean-up events, and educating residents on proper waste disposal. These collective efforts foster awareness and responsibility, ultimately leading to healthier soil and environments.
What technologies help monitor soil pollution levels?
Technologies that help monitor soil pollution levels include remote sensing, soil sensors, and geographic information systems (GIS). These tools enable real-time data collection and analysis, allowing for effective tracking and management of soil quality.
What are the restoration techniques for polluted soil?
The restoration techniques for polluted soil include bioremediation, phytoremediation, soil washing, and thermal treatment. These methods aim to remove or neutralize contaminants, improving soil quality and ensuring safety for human use.
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