Alexei Volkov
The distinctive smell of new plastics is caused by the release of volatile components, such as plasticizers like bisphenols, left-over monomers from the polymerisation process, or breakdown products. These small molecules are volatile at room temperature, and can be detected by our sense of smell. Recycled plastics may also have a residual odor due to pollutants from the recycling process, which can restrict their use in certain applications. To remove unwanted plastic odors, methods such as rinsing with mild soap and water, using baking soda, or airing out the plastic item in fresh air and sunshine are commonly employed.
| Characteristics | Values |
|---|---|
| Cause of the smell | Residual monomers, additives, or breakdown products |
| Volatile compounds | Aldehydes, benzene derivatives, styrene, p-xylene, benzaldehyde, methylbenzene, and 1,2-dichlorobenzene |
| Removal methods | Airing out, using baking soda, vinegar, charcoal, dry coffee grounds, or newspaper |
| Health impact | May hurt consumers' health |
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What You'll Learn
- Odours in new plastics are caused by volatile compounds
- These compounds are often aldehydes, benzene derivatives, or other chemicals
- Recycled plastics may also contain pollutants from their previous use
- Plastics are made of artificial polymers derived from oil
- Odours can be removed by cleaning or using odour-absorbing substances like baking soda
Odours in new plastics are caused by volatile compounds
For example, the water in clear drinks bottles made of PET (polyethylene terephthalate) that are left in the sun can become contaminated with some of the starting products used to make the plastic, such as bisphenol A. This could be the source of the taste in the water. Similarly, plastic bin bags have a strong smell when first opened, and water left in plastic bottles can acquire a distinct taste.
Recycled plastics may also have unwanted odours due to pollutants from the recycling process, the collecting system, or the plastic's previous life. These volatile substances in combination with other species could generate unpleasant odours, which restrict the use of recycled polymers to a lower grade of applications than the source material, especially in the food and automotive fields.
To identify the specific volatile compounds causing undesirable odours in plastics, various analytical techniques can be employed. For instance, solid-phase microextraction (SPME) can be used to extract and analyse volatile compounds in plastics. This technique involves optimising the SPME fibre type, extraction temperature, and time to achieve efficient extraction of volatile compounds. Other methods include electronic nose (E-nose), headspace-gas chromatography-ion mobility spectrometry (HS-GC-IMS), and headspace-gas chromatography-mass spectrometry (HS-GC-MS) combined with multiple chemometrics methods.
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These compounds are often aldehydes, benzene derivatives, or other chemicals
The smell of new plastics is caused by volatile substances and small molecules that are present in the plastic. These compounds are often aldehydes, benzene derivatives, or other chemicals, which can be left over from the manufacturing process or created through the breakdown of the plastic's polymers. Aldehydes commonly found in recycled plastics include pentanal, hexanal, heptanal, octanal, nonanal, and decanal. Benzene derivatives include styrene, p-xylene, benzaldehyde, methylbenzene, and 1,2-dichlorobenzene. These compounds can also be present in the starting materials used to make the plastic, such as bisphenol A, which can contaminate the water in clear drinks bottles made of PET (polyethylene terephthalate).
The smell of new plastics is particularly noticeable and unpleasant, often described as a strong, tangy, or "plasticky" scent. This smell can be removed using various methods, including rinsing and washing the plastic item with mild dish soap and water, or using odor-absorbing substances such as baking soda, dry coffee grounds, or newspaper. Leaving the plastic item outdoors in fresh air and sunshine can also help to dissipate the smell.
In some cases, the odor of new plastics may be due to inferior manufacturing processes or the addition of odorizing substances to cover up other smells. For example, some manufacturers may add a cheap orange flavor to their products to mask other odors. However, it is important to note that identifying the specific source of a plastic smell without professional analysis can be challenging.
The presence of these volatile compounds in plastics can have negative implications for their use in certain applications, particularly in the food and automotive industries. Recycled plastics, in particular, may contain pollutants from the recycling process or previous use that can be harmful to consumer health and hinder their acceptance in the broader market. Therefore, it is crucial to authenticate and characterize recycled materials properly to ensure their safety and broaden their applicability.
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Recycled plastics may also contain pollutants from their previous use
The world is facing a challenge in dealing with the enormous amount of plastic waste being generated. Plastic pollution has adverse effects on the environment, ecosystems, and human health. Plastic particles and other plastic-based pollutants are now found in our environment and food chain. The increasing volume of plastic residue has led to a growing interest in plastic recycling as an alternative to mitigate this problem.
However, recycled plastics may also contain pollutants from their previous use, which can be harmful to consumers. These pollutants can come from the recycling process, the collecting system, or the previous life of the plastic. For example, recycled plastic products may contain hazardous waste such as toxic organic compounds, heavy metals, and ozone-depleting compounds. These pollutants can have negative health effects and require special handling, dumping, and recycling processes to minimize environmental damage.
The residual odor of recycled plastics is a significant issue that hinders their application. Unpleasant odors in recycled plastics are caused by volatile compounds, which can restrict the use of recycled polymers to lower-grade applications, especially in the food and automotive fields. Friendly-user technologies that analyze volatile organic compounds (VOCs) in plastic materials are mainly applied in research laboratories but have not yet been established on an industrial scale.
To address the problem of plastic pollution, many scientists and conservationists advocate for improved waste management systems, better product design, and a reduction in the manufacturing of single-use plastics. Financial incentives for the return of used plastics and the establishment of frequent take-back stations can also encourage recycling and help with the sorting process. Additionally, biodegradable plastics can be a more sustainable and environmentally friendly alternative to traditional plastics, provided that appropriate waste management practices are followed.
The odors on new plastics can be attributed to several factors. One source of odor is the residual monomer that makes up the plastic, such as ethylene, which is not odorless. Some plastics may also have added odorizing substances to cover up other smells, often tangy or citrusy scents. In some cases, the unpleasant odor may be due to inferior manufacturing practices to reduce costs. While it is challenging to determine the exact source of an odor without professional analysis, certain compounds responsible for odors in plastics are banned in specific regions, such as the EU and Italy.
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Plastics are made of artificial polymers derived from oil
The unique smell of new plastics can be attributed to several factors, including the presence of residual monomers, volatile organic compounds (VOCs), and added odorizers. While this odor may be undesirable in certain contexts, it is often indicative of the chemical composition and manufacturing processes involved in plastic production.
Plastics are indeed made of artificial polymers derived from oil, specifically crude oil, and natural gas, which are fossil fuels. The process begins with the extraction of these raw materials, which are composed of thousands of compounds. Through a refining process, the crude oil is heated and separated into lighter components called fractions. One of these fractions, naphtha, is crucial for plastic production. This is where the artificial aspect comes into play—the monomers, or basic building blocks of polymers, are derived from these fractions.
The term "polymer" comes from the Greek words "poly," meaning "many," and "mer," meaning "repeating unit." Thus, polymers are formed by covalently joining many monomer units together in long chains. In the context of plastic production, ethylene and propylene monomers are linked together through a process called polymerization to create long polymer chains. These polymers are then processed with the addition of chemicals, such as antioxidants and stabilizers, and converted into strings and pellets.
The pellets are then melted and molded into various final products, with specific properties tailored to their intended applications. This customization is achieved by varying the elements used, changing monomer types, and rearranging their patterns to manipulate the shape, molecular weight, and other chemical and physical properties of the resulting plastic.
While plastics have become an integral part of modern life, there is growing concern about their environmental impact and the presence of potentially harmful substances. Efforts are being made to improve recycling processes and develop more sustainable alternatives, such as bioplastics derived from plant crops. Additionally, the development of biodegradable plastics and more efficient recycling technologies are areas of active exploration.
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Odours can be removed by cleaning or using odour-absorbing substances like baking soda
Odours in new plastics are often caused by volatile substances and other pollutants from the recycling process, collecting system, or previous life of the plastic. These can include aldehydes, benzene derivatives, and monomers such as ethylene, which has a distinctive tangy smell. While some odours may be covered up by manufacturers with added substances, they can still be unpleasant and off-putting to consumers.
If you're looking to remove these odours, cleaning the plastic is a good first step. Simply washing the plastic with soap and hot water can help eliminate unwanted smells. However, if the odour is particularly stubborn, you might want to try using odour-absorbing substances like baking soda. Also known as bicarbonate of soda, baking soda is a base that can neutralise acidic odours. Here are some ways to use it:
- Sprinkle baking soda generously over the plastic item or into the container. You can also add a bit of water to make a paste and rub it all over the interior.
- If your container has a lid, sprinkle some baking soda on it as well.
- Let the baking soda sit for a few hours or even overnight. The longer you leave it, the more time it has to absorb and neutralise odours.
- Finally, rinse the container and wash it normally with soap and water.
You can repeat this process if needed until the odour is gone. Baking soda is a great, natural way to remove smells from plastics without the use of harsh chemicals. It's a simple and effective method that can make a big difference in keeping your plastics fresh and odour-free.
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Frequently asked questions
Plastics are made of artificial polymers that comprise a string of monomers derived from oil. The polymers consist of very long chains of atoms that are not chemically bonded to each other. Plastics have a smell because they are not as inert as we think they are, and they exude their more volatile components.
The smell comes from the small molecules that are volatile at room temperatures. These could be additives, left-over monomers from the polymerisation process, or breakdown products.
Some examples include aldehydes (pentanal, hexanal, heptanal, octanal, nonanal, and decanal) and benzene derivatives (styrene, p-xylene, benzaldehyde, methylbenzene, and 1,2-dichlorobenzene).
There are several ways to get rid of the plastic smell. One way is to air out the plastic item outdoors in the sun. You can also use baking soda, vinegar, or dry coffee grounds to absorb the odour.
The smell of plastic can be due to inferior manufacturing, as some manufacturers may cut costs by using cheaper materials that have stronger odours.
