Maya Ellison
Plastic is a ubiquitous part of modern life, and plastic pollution is a growing concern. Plastics break down into smaller particles called microplastics, which are less than 5mm in length, and microplastics can further break down into even smaller pieces called nanoplastics, which are less than 1 micron in size. These particles are so small that they can enter the human body through ingestion and inhalation, and they have been detected in human blood, lungs, gut, feces, and reproductive tissues. Scientists estimate that people may be ingesting up to 100,000 microplastic particles per day, and a recent study found that a liter of bottled water can contain up to 400,000 nanoplastic particles. The potential health effects of these particles are still unknown, but they are a source of pollution and have been found in various ecosystems, including the ocean, where they are ingested by marine life.
| Characteristics | Values |
|---|---|
| Number of plastic particles | 100,000 |
| Size of each particle | Less than 5mm in length (smaller than a sesame seed) |
| Other names | Microplastics, Nanoplastics |
| Found in | Bottled water, seafood, human blood, lungs, gut, feces, reproductive tissues |
| Harmful? | Yes, they are dangerous to human health and the environment |
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What You'll Learn
Microplastics in bottled water
Plastic is everywhere, and it ends up in the ocean. Most plastics in the ocean break up into very small particles called "microplastics". These are plastic particles that are less than five millimetres in length (about the size of a pencil eraser).
Microplastics come from a variety of sources, including larger plastic debris that degrades into smaller pieces. They are also formed from the decomposition of bigger plastics, such as a bottle or bag that becomes weathered by waves or solar radiation. These tiny particles have been found in a variety of ecosystems, including remote environments.
Bottled water has long been marketed as a safer alternative to tap water. However, a new study by scientists at Columbia University and Rutgers University demonstrates that bottled water may be far worse when it comes to microscopic plastic pollutants. The study, published in the Proceedings of the National Academy of Sciences, found that the average litre of bottled water contains nearly 240,000 tiny pieces of plastic, ranging from 110,000 to 400,000. Approximately 90% of these particles were considered "nanoplastics", which are smaller than one micrometer and cannot be seen with the naked eye.
The potential health impacts of nanoplastics are still unknown, but researchers agree there is cause for concern. Nanoplastics can enter the body's cells and tissues, and may carry chemical additives that could cause cell stress, DNA damage, and changes in metabolism or cell function. They can also cross membranes that they are not meant to cross, such as the blood-brain barrier.
To avoid microplastics in bottled water, it is recommended to use glass or steel water bottles and home filtration systems.
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Microplastics in the human body
Microplastics are plastic particles that are less than five millimetres long. They can be found in the air, water, salt, animals, and human beings. They are formed from the decomposition of larger plastics, such as when a plastic bottle or bag degrades over time, emitting microplastic particles. They are also manufactured to be small, such as the microbeads found in health and beauty products.
It is estimated that humans ingest the equivalent of a credit card's worth of microplastics every year. Humans can be exposed to microplastics through the food we eat, the air we breathe, and the water we drink. Seafood is a common source of microplastics, as they absorb microplastics by filtering seawater. Microplastics have also been found in fruits and vegetables, plastic water bottles, cosmetics, and household dust.
Microplastics have been detected in almost every part of the human body, including breast milk, the placenta, testicles, hearts, livers, kidneys, blood, and lungs. While the exact health effects of microplastics on humans are still unknown, there are concerns about their potential impact on fertility and cancer risk. Laboratory tests have shown that microplastics can cause damage to human cells, including allergic reactions and cell death. Studies have also found associations between microplastics and poor health outcomes, including cardiovascular disease and low male fertility.
The presence of microplastics in the human body is a relatively new area of research, and more studies are needed to fully understand their impact on human health. However, the widespread presence of microplastics in the environment and human bodies has raised concerns among researchers and public health experts.
The impact of microplastics on human health is a complex and controversial topic. While some researchers argue that the presence of microplastics in the body may have negative consequences, others suggest that the definition of harm is debatable, and that the focus should not only be on human health but also on the potential harm to animals and ecosystems.
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Microplastics in the environment
Microplastics are small plastic pieces ranging in size from 1μ to 5 mm in diameter. They are water-soluble and can be either primary, as they are initially created in small sizes, or secondary, as they develop due to plastic degradation. They have accumulated in the environment as a consequence of the direct release of small particles, such as those used in cosmetics, or as a consequence of wear, for example, fibres released from textiles.
The main source of microplastics is considered to be the fragmentation of larger items of plastics in the environment. They are widely distributed in freshwater and marine environments, including remote locations such as the Arctic and deep sea. A wide range of organisms are known to ingest microplastics, and laboratory studies indicate the potential for harmful effects. Plastic debris can also transport co-contaminants, including chemical additives and pollutants absorbed from seawater.
Microplastics are present throughout the seafood chain, from zooplankton and little fish to huge ocean predators. The stomachs of marine species are full of microplastics, which affects their health through possible intoxication. It is a problem that affects the whole food chain, including humans. If we eat fish that have ingested microplastics, they end up inside us, too. Microplastics are also a source of air pollution, encountered in the form of dust and fibrous particles in the air.
Scientists from Wageningen University in the Netherlands say that, depending on our exposure, we may ingest up to 100,000 microplastic particles per day. This is the equivalent of eating a credit card once a year. Researchers at Columbia and Rutgers universities found that microplastic particle levels in bottled water ranged from 110,000 to 400,000 per litre, averaging at around 240,000.
Microplastics are a worldwide problem that has a detrimental impact on every component of the freshwater environment. They act as carriers for various toxic components such as additives and other hazardous substances from industrial and urbanized areas. These microplastic-contaminated effluents are ultimately transferred into water systems and directly ingested by organisms associated with a particular ecosystem.
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Microplastics in seafood
Microplastics are plastic particles less than five millimetres in length (about the size of a pencil eraser or a sesame seed). They come from a variety of sources, including larger plastic debris that degrades into smaller pieces, microbeads in health and beauty products, and resin pellets used for plastic manufacturing. These particles are so small that they pass through water filtration systems and end up in oceans and other water sources, posing a threat to aquatic life and contaminating the food chain.
Seafood is a significant source of microplastics in the human diet. A recent study found microplastic contamination in 99% of seafood samples, with the highest levels detected in shrimp. These microplastics can travel from the gills or mouths of fish to the meat that humans consume. The study also found that rinsing seafood could reduce microplastic levels.
The presence of microplastics in seafood has implications for human health. Once ingested, microplastics can reach the gastrointestinal tract and be absorbed, causing oxidative stress, cytotoxicity, and translocation to other tissues. They can also release chemical substances, including potentially toxic elements, that may be harmful to humans. However, the data currently available is not sufficient to perform a reliable assessment of the risks to human health.
The widespread contamination of seafood with microplastics highlights the need for a systematic approach to reduce the threat posed by these particles to both the environment and human health. This includes improving waste management practices, reducing plastic use, and implementing policies to ban or tax single-use plastics. Individual actions, such as reducing plastic consumption and proper waste disposal, can also help address the problem.
While the exact health risks of microplastics in seafood are still being studied, their presence in the food chain is undeniable. As such, ongoing research and monitoring of microplastic levels in seafood are crucial to understanding the potential biological consequences of exposure and developing effective strategies to mitigate their impact on human health and the environment.
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Sources of microplastics
Microplastics are a global threat to the environment and food safety. They are "synthetic solid particles or polymeric matrices, with regular or irregular shape and with size ranging from 1 μm to 5 mm, of either primary or secondary manufacturing origin, which are insoluble in water."
Primary Microplastics
Primary microplastics are plastic particles designed to be very small to carry out their intended function. They are often found in cosmetics, such as exfoliating face washes, toothpaste, and sunscreen. They are also used in the healthcare and pharmaceutical sectors, including as vectors for drugs and dentist polish. Other sources of primary microplastics include:
- Facial cleansers
- Compressed air-sprayed abrasives
- Medicine-produced vectors
- Unprocessed plastic production pellets
- Dish detergents
- Plastic bio-beads used in wastewater treatment plants
Secondary Microplastics
Secondary microplastics are derived from the breakdown and degradation of larger plastic debris, both at sea and on land. This can be caused by a combination of physical, chemical, and biological processes, including photo-oxidation from sunlight exposure. Examples of sources of secondary microplastics include:
- Degradation of plastic bags, water bottles, and other plastic materials
- Tyre wear from car, vehicle, and aircraft tires
- Synthetic textiles, such as polyester clothing
- City dust, including artificial turf, building paints, and industrial abrasives
- Paint, which is the largest source of microplastic leakage into oceans and waterways
- Washing machines, which contribute to the aquatic ecosystem through discharges from sewage treatment plants
Impact on the Environment and Human Health
Microplastics have been found in all environmental compartments, including sediment, soil, water, and surface layers in marine, freshwater, and terrestrial ecosystems. They have also been detected in various food sources, including aquatic species such as mussels, oysters, crabs, shrimp, and fish. The consumption of contaminated seafood is a potential source of human exposure to microplastics, and the presence of microplastics in the food chain can have consequences for human health. While the full impact of microplastics on human health is not yet fully understood, studies have shown that they can disrupt reproductive systems, stunt growth, diminish appetite, and cause tissue inflammation and liver damage in marine environments.
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Frequently asked questions
Plastic particles less than five millimeters long (about the size of a sesame seed) are called "microplastics". Microplastics can break down into even smaller pieces called nanoplastics, which are less than 1 μm in size.
Microplastics can come from a variety of sources, including larger plastic pieces that have broken apart, resin pellets used for plastic manufacturing, or microbeads found in personal care products such as exfoliant creams, bath gels, and toothpaste.
Microplastics are dangerous to human health and the environment because they contain harmful chemicals that leak into the air, water, and food. They have been found in human blood, lungs, gut, feces, and reproductive tissues.
Scientists from Wageningen University in the Netherlands say that humans ingest up to 100,000 microplastic particles per day. This is the equivalent of eating a credit card once a year.
