Omar Khalid
Microplastics are tiny plastic particles that can be found in all kinds of water samples, from wastewater to drinking water. These particles cannot be seen, smelled, or tasted, and the only way to detect them is to have your water tested. While there is currently no standard method for testing water for microplastics, certified laboratories use a variety of techniques, including optical microscopy, polarized light microscopy, Raman spectroscopy, and FTIR spectroscopy. These tests can detect microplastic concentrations and identify the type and size of the plastic particles. Due to the potential environmental and health impacts of microplastics, testing for their presence in water is crucial.
| Characteristics | Values |
|---|---|
| Microplastics size | Between one micron (1 μm) and five millimeters (5 mm) in diameter |
| Nanoplastics size | Less than 1 μm |
| Detection methods | Optical microscopy, polarized light microscopy, Raman spectroscopy, FTIR Spectroscopy, py-GC/MS |
| Detection capabilities | Detect microplastics as small as 1 µm |
| Testing location | Certified laboratory |
| Testing water types | Drinking water (tap or bottled water) |
| Testing time | 3-5 business days |
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What You'll Learn
Microplastics in drinking water
Microplastics are tiny plastic particles, ranging in size from one micron (1 μm) to five millimeters (5 mm) in diameter. Nanoplastics are plastic particles that have degraded to less than 1 μm. They are frequently present in freshwaters and drinking water, including tap water and bottled water. Conventional drinking water treatment methods are often ineffective at removing smaller microplastics, and they can pass through standard filtration systems. As a result, microplastics can end up in drinking water, contributing to environmental pollution and potentially impacting human health.
The only way to know if microplastics are present in drinking water is to have it tested by a certified laboratory. There are currently no at-home testing options available. Microplastic testing kits are available for purchase, and these utilize methods such as optical microscopy, polarized light microscopy, and Raman spectroscopy to detect microplastics as small as 1 μm. These tests can identify the presence and concentration of microplastics in water samples, with some tests also providing information on the specific types of plastics detected.
The regulatory environment around microplastic testing is evolving, particularly with the inclusion of intentionally manufactured microplastics in the EU REACH Regulation in October 2023. This reflects a growing recognition of the potential risks associated with microplastics. While the concrete effects of microplastics on human health are still largely unknown, there is ongoing research into the potential health implications. Preliminary evidence suggests that high concentrations of microplastics in the body may provoke stress and immune responses.
To minimize the negative environmental and potential health impacts of microplastics, testing for their presence in drinking water is important. This can help inform human health risk assessments and guide the development of more efficient filtration methods to reduce microplastic pollution in water supplies. While the field of microplastic analysis is still emerging, with ongoing improvements in testing methods, certified laboratory tests currently offer the most accurate way to detect and quantify microplastics in drinking water.
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Testing methods
Microplastics are tiny plastic particles, ranging in size from one micron (1 μm) to five millimetres (5 mm) in diameter. Nanoplastics are plastic particles that have degraded to less than 1 μm. These particles can be found in all kinds of water samples, from wastewater to drinking water.
The only way to know if microplastics are in your drinking water is to have your water tested by a certified laboratory. There are currently no at-home testing options available to the public. Testing kits are available for purchase, and certified lab partners will use a combination of optical microscopy, polarized light microscopy, and Raman spectroscopy to detect microplastics.
The three main methods for detecting and quantifying microplastic concentrations in water are:
- FTIR Spectroscopy: This technique can determine the number of microplastic particles by plastic type and size range.
- Py-GC/MS: This method can quantify the concentrations of specific types of microplastics in milligrams per litre (mg/l).
- Raman Spectroscopy: This technique can identify the number of microplastic particles by plastic type and size range.
Other techniques mentioned include optical microscopy and polarized light microscopy, which are used in combination with Raman spectroscopy. Testing for microplastics in samples is an important way to minimize the negative environmental effects of manufacturing and waste disposal processes.
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Water sources
Microplastics are a growing environmental concern, especially in drinking water sources. They are plastic grains less than 5mm in diameter, which are created from the processing of larger plastic discarded material or directly produced for products. These particles are everywhere: in the sea, rivers, groundwater, and our drinking water. They are released into the environment through various sources, and it is essential to understand these sources to address the issue effectively.
One of the primary sources of microplastics in water is plastic packaging, which accounts for about 35% of microplastic pollution. This includes discarded plastic bags, bottles, and other plastic waste that breaks down into smaller particles. The breakdown of larger plastic items, such as plastic mulch and agricultural chemicals, contributes to the presence of microplastics in water bodies.
Another significant source of microplastics in water is synthetic fabrics, which make up about 30% of the pollution. Microfibers from clothing shed during washing, and these tiny particles eventually find their way into water sources. Cosmetics, particularly those containing microbeads, also contribute to microplastic pollution. Wastewater treatment plants can also be a source, as they may release water containing microplastics due to incomplete filtration.
Water carrying plastics and other trash can eventually lead to water sources like rivers and reservoirs. Overflow from sewers, particles from the air, and liquid waste from factories and heavy industries can also introduce microplastics into water bodies. Additionally, microplastics can come from the breakdown of plastics in the environment, including the disintegration of plastic waste and the degradation of plastic containers used for food and drinks.
Testing water for microplastics is crucial to understand the level of contamination and make informed decisions about water safety and treatment. While there are basic methods for testing at home, sending samples to professional labs is recommended for more precise results. These labs use advanced techniques such as FTIR spectroscopy, Raman spectroscopy, and py-GC/MS to accurately detect, identify, and quantify microplastics.
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Health effects
While the health impacts of plastics are still a relatively new area of research, scientific results to date indicate that plastics cause diseases, disabilities, and premature death at every stage of their life cycle. The toxic chemical additives and pollutants found in plastics threaten human health on a global scale.
Scientifically proven health effects include causing cancer and changing hormone activity (known as endocrine disruption), which can lead to reproductive, growth, and cognitive impairment. Many of these toxic chemical additives have several other known health impacts, persist in the environment, and bioaccumulate in exposed organisms.
Research has found evidence of plastic particles in human blood, lungs, gut, feces, and reproductive tissues like the placenta and testes. However, the potential health effects of these tiny plastic bits are still unproven and unknown. The small size of nanoparticles has made them especially difficult to detect and study.
Microplastics can also act as vessels for pathogens to enter our systems, increasing the spread of diseases. They have been found to infiltrate brain tissue, with one source stating that "there's nowhere left untouched".
A growing body of evidence points to the health risks posed not only by plastic additives but also by direct exposure to plastic materials in the form of microplastics and nanoplastics. More than 16,000 chemicals are used to make plastic, of which at least 4,200 are chemicals of concern.
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Regulation
In the United States, microplastics remain largely unregulated. The Microbead-Free Waters Act of 2015 is the only piece of federal legislation in the field of microplastics. This act amended the Federal Food, Drug, and Cosmetic Act (FD&C) to prohibit the manufacturing, packaging, and distribution of rinse-off cosmetics containing plastic microbeads. However, individual states are free to pursue their own legislation.
California is the first state in the US, and the world, to require monitoring for microplastics in drinking water. In 2022, the State Water Resources Control Board approved a policy handbook for testing water supplies for microplastics over four years. This handbook establishes a standard method for testing and reporting microplastics in drinking water. Under this plan, the state's largest water providers will be ordered to conduct quarterly testing for two years, beginning in the fall of 2023. The policy handbook also includes a definition of microplastics in drinking water and lays out a timeline for testing, including an initial, year-long pilot phase to test and hone sampling methods and provide training.
In addition to California's efforts, there are various other initiatives underway to regulate microplastics. The FDA has started a phase-out of certain PFAS in food-contact applications, beginning in 2021 and lasting three years. Seven class-action lawsuits have been filed against bottled water companies for microplastic content, starting in January 2023. While these steps are important, there is currently a lack of standardized methods for measuring microplastics, which creates uncertainty.
To effectively address the issue of microplastics in drinking water, a collective effort is needed from individuals, communities, researchers, and policymakers. Education, innovation, and collaboration are key to combating microplastic pollution. Lifestyle changes, such as using reusable bottles and bags, and proper plastic waste disposal, can also help reduce plastic use and prevent microplastic contamination. Continued research and the implementation of strict government regulations are critical in tackling this global challenge.
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Frequently asked questions
You can purchase a microplastics water test kit from a company like SimpleLab Tap Score or Measurlabs. These kits are designed for drinking water (tap or bottled water) only and cannot be used to analyse marine or surface water. The kits include all the materials needed for sample collection, easy-to-follow instructions, and shipping to an accredited lab.
Labs use a variety of methods to detect and quantify microplastic concentrations in water, including FTIR Spectroscopy, py-GC/MS, and Raman Spectroscopy. These techniques can determine the number of microplastic particles by plastic type and size range, as well as quantify concentrations of specific types of microplastics.
No, there are currently no at-home testing options available to the public that can identify the presence of microplastics in water. All tests must be conducted by a certified laboratory.
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