Environmental Chemistry: Explanation and Application

Environmental chemistry is the investigation of chemical reactions in water, air, land, and living ecosystems, as well as the impacts of human activities on these processes. The comprehensive research of chemical and biological events that occur in natural settings is known as environmental chemistry. Environmental chemistry is an interdisciplinary subject that involves atmospheric, aquatic, and soil composition, as well as analytical chemistry and connections to other fields of research. Environmental Chemistry allows students to investigate this aspect of chemistry. It also educates students aware of the potential environmental risks posed by chemicals and urges them to seek out environmentally acceptable alternatives. Knowing how well the unpolluted environment functions, which compounds are present naturally in what concentrations, and with what consequences, is the first step in environmental chemistry. Let’s have a closer look at the topic and discuss some important question.

Key Takeaways: Definitions, Classifications, Environment and Pollution types, Acid Rain, Greenhouse Effect 

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Environmental Classifications

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In simple terms, the environment is our immediate surroundings, which includes both biotic and abiotic influences. We live in a setting, which could be natural, social, or constructed. These are the environments in which humans, plants, and animals exist. Given the diversity of the world in which we live, it is difficult to classify the environment properly. However, there are two sorts of environments that are widely recognized and accepted: natural or geographical environments and man-made environments. Geographical and manmade environments are the two basic categories in which the environment is classified.

• Geographical Environment - The sciences of climatology, geology, and biogeography are all part of the geographical environment. They are direct manifestations of how human society views the Earth's landscape. Because it interacts with nature, the geographical environment is sometimes known as a natural environment. Natural environment examples include the earth's surface, rivers, mountains, deserts, land, water, oceans, volcanoes, and so on. Geographical environment refers to the terrestrial environment, which is made up of a variety of natural and environmental factors. 

• Man-made Environment - A social environment is also referred to as a man-made environment. Man cannot live in his geographical environment directly, so he constructs some of his own environmental conditions to compensate. This is a man-made or human-made environment that was created by humans. The social environment that lasts as long as society values it is known as the inner environment. The inner environment has a huge influence on people's life. The outside environment is the physical world that man has constructed on his own via the advancement of science and technology. The alteration of the physical environment has aided in the advancement of people and the development of the environment. 

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Types of Environmental Pollution

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The introduction of harmful or hazardous items into the natural environment is known as pollution. Pollution also refers to the presence of undesired elements in the natural environment, as well as the contamination of the natural environment with potentially harmful compounds as a result of human activity. Because they contaminate and modify natural habitats, pollutants are collectively referred to as contaminants. The numerous types of pollution are listed below.

1. Air pollution - Air pollution is defined as the introduction of dangerous compounds into the atmosphere that has negative consequences for the environment and humanity. Air pollution simply means that the air is dirty or contaminated. 

2. Water pollution - The act of contaminating water bodies such as rivers, oceans, lakes, streams, aquifers, and groundwater is known as water pollution. It occurs when foreign dangerous items such as chemicals, garbage, or polluted substances are dumped into water bodies, either directly or indirectly.

3. Land Pollution - The degradation or reduction in the quality of the earth's land surfaces in terms of use, landscape, and ability to support living forms is referred to as land pollution. Human activities and overuse of land resources are frequently the cause, both directly and indirectly.

4. Soil Pollution - Soil contamination occurs when chemical pollutants pollute the soil or when the soil is deteriorated by activities such as mining, vegetation clearance, or topsoil erosion.

5. Noise Pollution - Noise pollution is often defined as an unwelcome sound or sound that causes excruciating pain in the ears. Noise pollution is defined as unfavorable sound levels that cause significant discomfort to all living beings. It's expressed in decibels (dB).

6. Thermal Pollution - When water bodies are damaged in terms of temperature, this is known as thermal pollution. It usually occurs when people or companies engage in activities that cause a natural water body's temperature to drop or rise quickly, such as lakes, rivers, oceans, or ponds.

7. Industrial Pollution - The release of wastes and pollutants generated by industrial activity into the natural environment, including air, water, and land, is known as industrial pollution. Air emissions, discharge of spent water into water resources, landfill disposal, and injection of harmful compounds underground are all examples of pollutants and wastes produced by companies.

8. Light Pollution - Light pollution occurs when artificial lights are used for longer periods of time and in excess, resulting in the brightening of the night sky. As a result, it disrupts the activities and normal cycles of wildlife, as well as human welfare. It is inconvenient whenever artificial lights are utilized in places where they are not intended.

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About Tropospheric Pollution

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Tropospheric pollution is caused by both gaseous and particulate air contaminants. Sulfur oxides, nitrogen oxides, and carbon monoxide are among the gaseous air pollutants that contribute to pollution. Acid rain and photochemical smog, as well as the greenhouse effect and global warming, are all caused by chemical and photochemical reactions in the environment. Different types of particles, both viable and non-viable, are also responsible for substantial air pollution.

Sulfur and nitrogen oxides are produced when fossil fuels (coal, car fuel) are burned. In the presence of oxygen in the air, they react with water to generate nitric and sulphuric acids. Acid rain is produced as a result, which is detrimental to agricultural plants and trees. It causes a variety of respiratory problems. 

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What is Acid Rain?

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Acid rain, also known as acid deposition, is a general phrase that refers to any type of precipitation that contains acidic components, such as sulfuric or nitric acid, and falls to the ground in wet or dry form from the atmosphere. This can include acidic rain, snow, fog, hail, or even dust. Acid rain is most typically associated with wet deposition. Sulfuric and nitric acids generated in the sky mix with rain, snow, fog, or hail to fall to the ground.

In the absence of moisture, acidic particles and gases can settle as dry deposition from the atmosphere. Acidic particles and gases may swiftly settle on surfaces (water bodies, vegetation, and structures) or react with larger particles in the atmosphere, posing a threat to human health. When stored acids are washed off a surface by the next rain, acidic water pours over and through the ground, harming plants and fauna including insects and fish. 

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The Greenhouse Effect

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The greenhouse effect describes how "greenhouse gases" trap heat at the Earth's surface. These heat-trapping gases are like a blanket wrapped over the earth, keeping it warmer than it would be otherwise. Greenhouse gases are produced naturally and are part of the composition of our atmosphere. As a result, Earth is sometimes referred to as the "Goldilocks" planet because its temperatures are just suitable for life (including humans) to thrive.

However, people have been meddling with the planet's energy balance for the past century or two, primarily through the burning of fossil fuels, which release carbon dioxide into the atmosphere. Carbon dioxide levels in the atmosphere have been steadily growing for decades, trapping more heat at the Earth's surface and rising temperatures.

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Things to Remember

• Environmental pollution is wreaking havoc not only on humans but also on animals, putting numerous species in jeopardy or perhaps extinction.
• Everything in our world is interrelated, and while nature provides us with essential environmental services without which we would perish, we all rely on one another's actions and how we manage natural resources.
• It is commonly acknowledged that we are massively blowing our current natural resource budget — at current rates of exploitation, the environment will not be able to recover in a timely manner or continue to "perform" well in the future.
• Perhaps we should take a more holistic approach to nature - it is not a distinct entity from us; nature is us, and we are an inherent part of it, and we should treat it with respect. Only then will we be able to address the issue of pollution in the environment.

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