Chloe Zhang
Plastic pollution in saltwater is a pressing environmental issue. Millions of tonnes of plastic enter the world's oceans annually, with plastic debris found in seawater, sea salt, and marine life. This plastic pollution comes from various sources, including abandoned fishing gear, littering, and microplastics from personal care products and synthetic clothing. Recent studies have also found microplastics in salt from the US, Europe, and China, indicating that plastic pollution is pervasive in the environment and entering the food chain. To address this issue, researchers are working on developing environmentally friendly plastics that dissolve in saltwater and using genetically modified bacteria to break down plastic pollution.
| Characteristics | Values |
|---|---|
| Plastic in saltwater | Plastic waste in the ocean can take more than 500 years to break down. |
| Researchers have developed a new type of plastic that dissolves in saltwater. | |
| Microplastics are found in salt from the US, Europe, and China. | |
| Plastic is found in drinking water and beer. | |
| Plastic fibres are found in tap water around the world. | |
| Up to 12.7 million tonnes of plastic enter the world's oceans every year. | |
| Plastic leaches bisphenol A, which has been found in the urine of 95% of US adults. | |
| Safer plastics | Polypropylene and HDPE are preferred for aquarium water storage as they leach fewer chemicals. |
| LDPE plastics leach a lot of chemicals, including phthalates. | |
| HDPE is the most common food-safe plastic, but not all HDPE is food-safe. | |
| Genetically modified bacteria | Vibrio natriegens and Ideonella sakaiensis can break down polyethylene terephthalate (PET), a common plastic pollutant. |
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What You'll Learn
Microplastics are found in salt from the US, Europe, and China
Plastic pollution is pervasive in the environment, and microplastics have been detected in salt from the US, Europe, and China. A study by National Geographic found microplastics in 90% of table salt, with the highest quantities found in salt sold in Indonesia. The study analysed salt samples from 21 countries in Europe, North and South America, Africa, and Asia. The density of microplastics varied among different brands, with Asian brands containing the highest levels.
In 2015, scientists first found plastics in salt in China. Microscopic plastic particles from face scrubs, cosmetics, and plastic bottles were discovered in 15 salt products from Chinese grocery stores. Researchers now believe that sea salt may be more vulnerable to plastic contamination due to the dehydration of seawater in its production process.
A separate study by the University of York in Britain examined the potential risks of microplastics to the environment. It reviewed 320 existing studies and found "major knowledge gaps" in understanding the impact of microplastics. The health effects of ingesting plastic are unknown, and scientists have struggled to research this area due to the lack of a control group unexposed to plastic.
Microplastics have been detected in tap water and seafood worldwide, indicating their presence in saltwater bodies. The consumption of seafood products and salt may be significant routes of human exposure to microplastics, which have been shown to carry hazardous chemicals and microorganisms. The pervasive nature of plastics in the environment means they are present in the air, water, seafood, beverages, and salt that humans consume daily.
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Plastic pollution is pervasive in the environment
Plastic pollution is a pressing issue that has far-reaching effects on the environment. Single-use plastics, such as water bottles, are a significant contributor to this pollution, with an estimated 12.7 million tonnes of plastic entering the world's oceans annually. This plastic waste does not readily break down, persisting in the environment for hundreds of years. As a result, plastic fibres have been detected in tap water worldwide, and microplastics have been found in sea salt from various countries, including the US, the UK, France, Spain, and China. This indicates that plastic pollution is pervasive and has made its way into the food chain, with potential unknown health consequences for humans and other organisms.
The presence of plastics in saltwater ecosystems is particularly concerning. While some plastics are marketed as "biodegradable," they do not effectively degrade and dissolve in water, leading to the accumulation of microplastics in the oceans. These microplastics can be ingested by marine wildlife and have been shown to impact their health negatively. Additionally, microplastics can absorb and release toxic chemicals, further contaminating the marine environment.
To address this issue, researchers have been working on innovative solutions. Scientists from the Riken research institute in Japan have developed an environmentally friendly plastic that fully dissolves in saltwater without leaving behind any microplastic traces. This new material is strong and durable, comparable to conventional plastics, and can be easily recycled. The process involves creating a reversible salt bridge bond between two molecular building blocks, which can then be degraded by placing the plastic in saltwater. This approach offers a promising alternative to traditional plastics and could help reduce plastic pollution in the oceans.
Furthermore, advancements in biotechnology have led to the development of genetically modified microorganisms that can break down plastics in saltwater. Researchers have engineered a bacterium, Vibrio natriegens, to express enzymes that enable it to break down polyethylene terephthalate (PET), a common plastic pollutant in oceans. This breakthrough demonstrates the potential of using microorganisms to combat plastic pollution in saltwater environments, providing new avenues for remediation and waste management strategies.
While these developments offer hope in the fight against plastic pollution, it is essential to recognize that plastic waste remains a pervasive issue in the environment, especially in saltwater ecosystems. The long-term effects of plastic pollution on marine life and human health are still not fully understood. Continued efforts are necessary to develop and implement sustainable alternatives to traditional plastics, as well as effective waste management strategies, to mitigate the impact of plastic pollution on our planet.
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The health impact of ingesting plastic is unknown
Plastic pollution is a pressing issue, with microplastics and nanoplastics found in the environment, including in the oceans, soil, and air. Humans are exposed to these plastic particles through inhalation and ingestion of contaminated food and water. While the presence of microplastics in the human body has been confirmed, the health impact of ingesting plastic remains unknown.
The challenge in studying the health effects of ingesting plastic lies in finding a control group of humans who have not been exposed to plastic pollution. Researchers have stated that "everybody is being exposed to some degree at any given time, from gestation through death." This ubiquitous exposure to plastic makes it difficult to isolate and study the specific health impacts of ingestion.
Laboratory tests on animals have provided some insights into the potential health effects of plastic ingestion. Studies on animals have indicated that plastic particles can cross the gut barrier and travel through the body. An Australian study in 2019 found that Japanese quail chicks exposed to plastic toxins experienced minor delays in growth and maturation but did not exhibit increased susceptibility to sickness, death, or reproductive issues. While these studies offer valuable insights, extrapolating the results directly to humans has limitations.
While there is limited evidence of significant adverse health impacts from microplastics, the field of study is relatively new, and more holistic research is needed. A 2018 study found microplastics in the feces of eight people, and another study detected microplastics in the placentas of unborn babies. Additionally, a recent study by Vethaak and colleagues found plastics in the blood of 17 out of 22 healthy blood donors. These findings highlight the presence of microplastics in the human body, but the specific health consequences remain uncertain.
The impact of ingesting plastic may depend on the type of plastic and the chemicals it contains. Different plastics have varying tendencies to leach chemicals, and these compounds are linked to serious health issues such as endocrine disruption, weight gain, insulin resistance, and decreased reproductive health. However, without comprehensive research, the full scope of health effects from ingesting plastic remains a mystery.
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Some plastics are safer than others
Plastic pollution is a pressing issue, with up to 12.7 million tonnes of plastic entering the world's oceans every year. This has led to plastic fibres being found in tap water and sea salt across the globe.
With this in mind, it is important to be aware of the plastics that are safer to use. Many plastics contain harmful chemicals that can leach into food and drinks, increasing exposure to substances linked to health concerns. Polystyrene, for example, is a known neurotoxin and possible carcinogen. It is used in styrofoam food trays, disposable cups and bowls, carry-out containers, and opaque plastic cutlery. Over fifty chemical byproducts are released during the manufacturing of polystyrene, contaminating the air, water, and communities that work and live near these facilities.
Some safer alternatives to polystyrene include:
- Polypropylene (PP): This plastic is ranked 5 and is safe for food storage. It is FDA-approved for food contact and has a high heat tolerance, ensuring it does not leak toxins when breaking down. PP plastic is also microwave and dishwasher safe.
- High-Density Polyethylene (HDPE): This is a common food-safe plastic, often used for large containers and buckets in restaurants to store flour, sugar, etc. It is important to note that not all HDPE is food-safe, as some may contain release agents used during manufacturing.
- Glass, stainless steel, and silicone containers: These materials are renewable, toxin-free, and heat-resistant, making them safer alternatives to plastic.
It is also recommended to avoid plastics ranked 3 or 6, as well as black plastics, #3 PVC, and #7 PC plastics, which are considered toxic and difficult to recycle.
While some plastics are safer than others, it is still important to reduce single-use plastic packaging and advocate for bans on harmful plastics to protect our oceans and ecosystems.
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Genetically modified bacteria can break down plastics in saltwater
Plastic pollution in the ocean is a pressing issue, with up to 12.7 million tonnes of plastic entering the world's oceans annually. This has led to plastic contamination in sea salt, drinking water, and beer, with potential unknown impacts on human health. To address this challenge, researchers have turned to genetically modified bacteria to break down plastics in saltwater.
The research focuses on two species of bacteria: Vibrio natriegens and Ideonella sakaiensis. V. natriegens thrives in saltwater and reproduces rapidly, making it an attractive candidate for saltwater applications. On the other hand, I. sakaiensis is remarkable for its ability to produce enzymes that enable it to break down and metabolize polyethylene terephthalate (PET), a common plastic found in water bottles and clothing.
By incorporating the DNA from I. sakaiensis responsible for plastic degradation into a plasmid, researchers were able to transfer this genetic sequence into V. natriegens. Plasmids are genetic sequences that can replicate independently within a cell, allowing the introduction of foreign genetic material. As a result, the modified V. natriegens bacteria expressed the desired enzymes on the surface of their cells, successfully breaking down PET in a saltwater environment at room temperature.
This breakthrough is significant because it is the first genetically engineered organism known to break down PET microplastics in saltwater. Previously, it was economically unfeasible to remove plastics from the ocean due to the high costs associated with salt removal before plastic breakdown. The researchers aim to further stabilize the production of plastic-degrading enzymes in the modified organism and ensure it can feed on the byproducts of PET breakdown, ultimately producing a desirable end product useful for the chemical industry.
While additional challenges remain, this research holds promise for addressing plastic pollution in marine environments and mitigating the presence of microplastics in our oceans, potentially reducing their impact on marine life, ecosystems, and human health.
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Frequently asked questions
Yes, millions of tonnes of plastic enter the world's oceans every year. Plastic fibres have been found in tap water and salt from the US, Europe, and China.
Plastic in saltwater comes from a variety of sources, including abandoned fishing nets, littering, and runoff from rain and wind. Single-use plastics such as water bottles, grocery bags, and straws are also major contributors.
Plastic in saltwater has detrimental effects on marine life, as animals can mistake plastic debris for food. When larger pieces of plastic break down, they turn into microplastics, which can be ingested by wildlife. Microplastics can absorb harmful pollutants like pesticides and release them into the ocean.
