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Environmental toxicology is the study of the harmful effects of chemical, physical, and biological agents on living organisms and the environment. It encompasses a wide range of topics, including the effects of pollutants on air, water, and soil; the impacts of pesticides and other chemicals on wildlife and human health; and the effects of radiation and other forms of energy on the environment.The goal of environmental toxicology is to understand how these agents interact with living organisms and the environment. The focus here is on substances in the environment that humans have produced.
Read more: The living world
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KeyTerms: Environmental toxicology, Environmental degradation, Toxicology, Bioaccumulation, SETAC
Environmental toxicology and chemistry
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The term "environmental toxicology," often written as "Entox" or "Environ Toxicol," refers to the scientific discipline that investigates the hazardous consequences of pollution on ecosystems. Toxic effects on the environment from various manmade and natural substances are also discussed. Pollutants in the environment can be either naturally occurring or manmade, hence the field of environmental toxicology studies how each type of pollutant affects the ecosystem. In the years since the field of environmental toxicology was established to investigate the effects of pollution on humans and other organisms, many advances have been made. It was because of this that the study of environmental health and toxicology developed into its own scientific discipline.
Environmental Toxicology and Chemistry
Environmental toxicology and pharmacology
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Environmental toxicology is linked to pharmacology since toxicology and pharmacology are both sub-disciplines of chemistry. Environmental toxicology is the branch of science that examines the negative impact that man-made chemicals and pharmaceuticals have on their natural habitats.
- It explains how harmful environmental conditions can affect the health of both people and animals.
- Pollution has a detrimental influence on living things not just on their external environments but also on their internal bodily systems.
- The field of environmental toxicology and pharmacology focuses on the recording and study of these effects and their trends over a given time frame.
- Environment Toxicity and Drug Effects is another name for this field of research.
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| Relevant Concepts | ||
|---|---|---|
| Useful Microorganisms | Ecology | Abiotic Factors |
| Insecticides | Tumor | Carcinogenicity & Toxicity |
Environmental toxicology and it's branch
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Due to the differentiation of environmental contaminants and their side-effects, environmental toxicology is separated into distinct fields.
Ecotoxicology
Specifically at the population, community, ecosystem, and biosphere levels, ecotoxicology examines the effects of toxic substances on living things. Ecotoxicology bridges the gap between toxicology and ecology, making it a science with many sub-specialties. In contrast to environmental toxicology, ecotoxicology considers the cumulative impact of stressors on organisms, communities, and ecosystems as a whole.
Environmental health toxicology
The contamination of our air, water, and soil has devastating effects on ecosystems and on human health. Cancer, asthma, and chronic obstructive pulmonary disease are just some of the illnesses that have been linked to exposure to industrial chemicals, heavy metals, and pesticides in the environment. Toxicity has far-reaching consequences, including effects on the nervous system, the immune system, the reproductive system, and the maturation of young infants.
Environmental degradation
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Environmental deterioration is caused due to institutional, socio-economical and technological activity. It's the gradual destruction of the planet when natural resources like water, air, and soil are used up. In this case, environmental deterioration is caused by both biotic and abiotic processes.
Abiotic Degradation
Hydrolysis and photolysis play significant roles in this well-known process.
- Hydrolysis
A hydrolytic reaction occurs when water reacts with another chemical substance, typically breaking it into two or more components. Hydrolysis, in its simplest form, refers to the process of chemical bond breaking facilitated by the combination of water and heat or light energy
Hydrolysis
- Photolysis
Light pollution is most common in the atmosphere and on the ocean's surface. In photolysis, molecules absorb light and are subsequently chemically disassembled into their constituent atoms and subatomic particles: Microorganisms such as fungus and bacteria are major contributors responsible for biotic deterioration. These microbes break down substances to obtain energy from these sources. The rate of this process is much faster than that of abiotic breakdown. To put it simply, it's a procedure that can cause compounds to be totally mineralized to carbon dioxide, water, and other inorganic elements. Bioremediation is a procedure wherein microorganisms are employed to remediate environmental pollutants.
Photolysis
Bioaccumulation
The term "bioaccumulation" refers to the process through which living things acquire chemicals from their nutrition or the abiotic environment. These organisms take in the poisonous chemicals through a process called passive diffusion. The lungs, gills, and digestive tract are some of the first points of contact for this poison. Scales, skin, feathers, fur, and other organs provide protection from a wide range of chemical toxins.
Bioaccumulation
Society of Environmental Toxicology and Chemistry
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The Society for Environmental Toxicology and Chemistry (SETAC) is a scientific organization concerned with protecting the environment.
- The group's primary mission is to devise plans for enhancing the quality of the environment and halting its degradation.
- This is done through hosting events such as conferences, workshops, rallies, and symposia where members can share and discuss new findings in environmental toxicology.
- Additionally, they support environmental toxicology education through the development of online resources and the implementation of various forms of public outreach.
- The association also puts out a publication devoted to the study of environmental pollution called Environmental toxicology and Chemistry.
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| Relevant Concepts | ||
|---|---|---|
| Decomposition | Nutrients | Plant Water Relations |
| Turgor Pressure | Principle of Genetics | Bacteria |
Things to remember
- Environmental toxicology is the study of the harmful effects of chemical, physical, and biological agents on living organisms and their environments.
- Exposure to environmental toxins can occur through various routes, such as inhalation, ingestion, and skin contact.
- The effects of environmental toxins can range from acute (immediate) to chronic (long-term) and can include cancer, birth defects, and other diseases.
- Some populations, such as children, pregnant women, and certain communities, may be more vulnerable to the effects of environmental toxins.
- To protect human health and the environment, it is important to identify and regulate environmental toxins through risk assessment and management strategies.
Sample questions
Ques. What is environmental toxicology? (2 marks)
Ans. The field of study known as environmental toxicology focuses on the detection, identification, and mitigation of potential threats to human health and the environment posed by chemical, physical, and biological agents.
Ques. What are some examples of environmental toxins? (2 marks)
Ans. Air pollutants like lead and sulphur dioxide, water pollutants like pesticides and heavy metals, and soil contaminants like radon and polychlorinated biphenyls (PCBs) are all examples of environmental poisons.
Ques. What are the effects of environmental toxins on human health? (2 marks)
Ans. Depending on the specific toxin, the dose, and the individual's vulnerability, the impact of environmental toxins on human health can range from mild discomfort to severe and life-threatening illnesses. Respiratory issues, neurological diseases, cancer, and birth defects are just some of the more typical outcomes.
Ques. How can we protect ourselves from environmental toxins? (5 marks)
Ans. The ways to protect ourselves from environmental toxins are:
- Reducing our exposure to air, water, and soil pollutants.
- Eating a diet high in fruits and vegetables.
- And being aware of potential sources of toxins in our homes and places of work are all great ways to safeguard ourselves from the harmful effects of our environment.
- One can also speak with a family doctor or other medical expert about potential environmental hazards and protective measures.
Ques. What is bioaccumulation? (3 marks)
Ans. Bioaccumulation is the process by which certain substances, such as heavy metals or persistent organic pollutants, accumulate in the tissues of living organisms.
- These substances can be taken in through food, water, or air, and can build up in the body over time.
- As they move up the food chain, the concentration of these toxins can increase as well, which is known as biomagnification.
Ques. What makes chemistry so crucial to the environment? (2 marks)
Ans. The field of environmental chemistry is socially significant because it addresses pressing societal concerns such as the effects of pollution on ecosystems, strategies for mitigating pollution, and the administration of environmental resources.
Ques. What is environmental degradation? (2 marks)
Ans. Environmental degradation refers to the deterioration of the natural environment through human activities, such as pollution, deforestation, overuse of natural resources, and climate change. It can lead to a decline in the quality of air, water, and soil, and can also result in the loss of biodiversity and the destruction of habitats for plants and animals.
Ques. Explain ecotoxicology. (5 marks)
Ans. Ecotoxicology is a field of study that focuses on the impacts of toxic chemicals on the environment and the organisms that live within it.
- It examines the effects of pollutants on entire ecosystems, including plants, animals, and microorganisms.
- Also examines the interactions between these organisms and their environment.
- The goal of ecotoxicology is to understand how pollutants move through the environment.
- And analyze the way they are taken up by living organisms, and how they affect the health and survival of those organisms.
Ques. How does toxicology affect the environment? (2 marks)
Ans. The toxicants found in pollutants, insecticides, pesticides, and fertilizers can have a negative impact on an organism and its community by lowering the number of available species. As a result of these shifts in population dynamics, the ecosystem's overall productivity and stability suffer.
Ques.who is the father of toxicology? (2 marks)
Ans. Orfila, whose full name was Mateu Joseph Bonaventura Orfila I Rotger, was a Spanish chemist who worked in the 19th century. There is no denying the impact he has had on the fast developing area of modern toxicology, which bears his name (1-2).
Ques. What are the basic principles of toxicology? (2 marks)
Ans. Dose-response relationships, chemical entry and metabolism/excretion, key health effects of intoxications, physiology 101, toxicokinetics, and cellular toxicology are all cornerstones of the field.
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