Microplastics effects on human health

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Humans are exposed to toxic chemicals and microplastics at all stages in the plastics life cycle We are exposed to toxic chemicals and microplastics at all stages in the plastics life cycle. The pollutants can get into our bodies in many ways.svg
Humans are exposed to toxic chemicals and microplastics at all stages in the plastics life cycle

Microplastics effects on human health are a subject of growing concern and an area of research. The tiny particles known as microplastics (MPs), have been found in various environmental and biological matrices, including air, water, food, and human tissues. Microplastics, defined as plastic fragments smaller than 5 mm, and even smaller particles such as nanoplastics (NP), particles smaller than 1000 nm in diameter (0.001 mm or 1 μm), have raised concerns impacting human health. [1] In scientific literature, combined microplastics and nanoplastics are referred to as MNPs or NMPs or NMPPs for nano-and microplastic particles.

Contents

Routes of exposure and bioaccumulation

The major routes of exposure include ingestion, skin contact, and inhalation. MNPs can remain in the organ of entry or enter systemic circulation to bioaccumulate in various tissues [2] depending on size. MNPs above 150 μm or 10 μm in diameter do not enter the blood and remain in tissues [3] whereas particles below 200 nm pass through intestinal barriers and reach extracellular spaces. [4]

Ingestion

Direct ingestion includes drinking water, [5] [6] beer, [7] honey and sugar, [8] table salt, [9] [10] and indoor airborne particulates falling on open meals. [11] [12] [13] Indirect ingestion includes toothpaste, face wash, scrubs, [14] [15] and soap [16] [17] and enter systemic circulation.

Maternally

Recent studies have shown the presence of microplastics in breast milk, often leading to exposures in very young children. While it has already been established that chemicals [18] such as flame retardants [19] [20] [21] and pesticides [22] have been detected in breast milk, knowledge about microplastics is limited in comparison. A study in 2022 [23] found plastics smaller than five millimeters in diameter in 75% of breast milk samples examined. It has been suggested that these plastics are especially dangerous for young children due to their role as hormone disruptors. Exposure during developmental stages can lead to long lasting developmental defects or other issues later in life. While these detected levels were not above the currently established thresholds for unsafe levels, they show another possible route for microplastic ingestion. For some native population in north Canada and people who live near industrial factories, it is sometimes suggested by pediatricians that mothers not nurse their children, [24] over fear of ingestion of microplastics and other potentially harmful chemicals. It has been suggested that mothers should directly breast feed their children instead of from a bottle. Studies have shown that pumping milk, freezing it in plastic bags, then subsequently heating it up will increase the contamination of microplastics in the milk. [25] Similar results have been seen from heating plastic reusable food containers in a microwave, showing the release of both microplastics and nanoplastics. [26] It has been suggested that mothers try to avoid ingesting microplastics themselves, to try and avoid passing them onto their children through breastfeeding. Studies have shown that drinking water from plastic bottles has significantly greater detectable plastic content than tap water. [27]

Contact

This is skin penetration through wounds and pores such as sweat glands and hair follicles [2] as the skin interacts with MNP-contaminated media such as soil or water [28] [29] and cosmetics mentioned above and enter systemic circulation.

Inhalation

This is indoor and outdoor airborne entry into the respiratory system [30] [12] [31] from upholstery and household furniture [32] to urban dust, rubber tires and synthetic fibers. [2] MNPs can remain in the lungs or be ingested via mucociliary clearance [33] to enter the systemic circulation.

Occupational exposure

Incidental generation of MNPs is mechanical or environmental degradation or industrial processes such as plastic manufacturing (heating and chemical condensation) and intentional generation of MNPs occur during in 3D printing such as multi-jet fusion or power-bed printing.

Acute inhalation is the main route of workplace exposure is acute inhalation. [33] Workplace exposure can be high concentration and lasting the duration of a shift and thus short-term whereas exposure outside of work is at low concentration and long-term. [34] The concentration of worker exposure is orders of magnitude higher than the general population (e.g., 4×1010 particles per m3 from extrusion 3D printers [35] versus 50 particles per m3 in the general environment [36] ).

High chronic exposure to aerosolized MNPs occur in: the synthetic textile industry, the flocking industry, and the plastics industry consisting of the Vinyl Chloride supplier and the Polyvinyl Chloride manufacturer. [37]

Manufacturing and processing of plastic

Environmental and mechanical degradation of plastic

Medical plastic

Microplastics per square meter in the EU sewage sludge (2015-2019) Microplastique par m2 UE via boues epuration CC BY SA1-s2.0-S0269749122004122-gr7 lrg.jpg
Microplastics per square meter in the EU sewage sludge (2015–2019)

Potential health risks

One of many routes humans are exposed to microplastics is via dermal contact which allows MPs penetration through skin pores P061337-299845.jpg
One of many routes humans are exposed to microplastics is via dermal contact which allows MPs penetration through skin pores

The potential health impacts of microplastics vary based on factors, such as their particle sizes, shape, exposure time, chemical composition (enriched with heavy metals, polycyclic aromatic hydrocarbons (PAHs), etc.), surface properties, and associated contaminants. [63] [64] Experimental and observational studies in mammals have suggested that microplastics and nanoplastics exposure may have adverse effects on human health, such as:

Laboratory investigations demonstrate that microplastics can damage human cells, triggering allergic reactions and cell death. [81] MPs may also disrupt hormone function, potentially contributing to weight gain. [82] [83]

Epidemiological studies

Despite growing concern and evidence, most epidemiologic studies have focused on characterizing exposures. Epidemiological studies directly linking microplastics to adverse health effects in humans remain yet limited and research is ongoing to determine the full extent of potential harm caused by microplastics and their long-term impact on human health. [84] [85]

Clinical studies

In a cohort study involving 304 patients who were undergoing carotid endarterectomy for asymptomatic carotid artery disease in 3 Italian hospitals, polyethylene was detected in carotid artery plaque of 150 patients (58.4%) with a mean level of 21.7±24.5 μg per milligram of plaque; 31 patients (12.1%) also had measurable amounts of polyvinyl chloride, with a mean level of 5.2±2.4 μg per milligram of plaque. Those with carotid artery plaque in which MNPs were detected had a higher risk of a composite of myocardial infarction, stroke, or death from any cause at 34 months of follow-up than those in whom MNPs were not detected. [86]

Mitigating inhalation exposure to MNPs

Also see Health and safety hazards of nanomaterials.

As April 2024, there is no established NIOSH Recommended Exposure Limit (REL) for MNPs due to limited data on exposure levels to adverse health effects, the absence of standardization to characterize the heterogeneity of MNPs by chemical composition and morphology, and difficulty in measuring airborne MNPs. [87] [88] And thus, safety measures focus on the hierarchy of controls for nanomaterials with good industrial hygiene to implement source emission control with local exhaust ventilation, air filtration, and nonventilating engineering controls such as substitution with less hazardous materials, administrative controls, Personal Protective Equipment (PPE) for skin and respiratory protection. [89]

Research from the U.S. National Institute of Occupational Safety and Health (NIOSH) Nanotechnology Research Center (NTRC) show local exhaust ventilation and High Efficiency Particulate Air (HEPA) filtration to be effective mitigation to theoretically filter 99.97% of nanoparticles down to 0.3 microns. [89]

See also

Related Research Articles

<span class="mw-page-title-main">Environmental health</span> Public health branch focused on environmental impacts on human health

Environmental health is the branch of public health concerned with all aspects of the natural and built environment affecting human health. In order to effectively control factors that may affect health, the requirements that must be met in order to create a healthy environment must be determined. The major sub-disciplines of environmental health are environmental science, toxicology, environmental epidemiology, and environmental and occupational medicine.

<span class="mw-page-title-main">Marine pollution</span> Pollution of oceans from substances discarded by humans

Marine pollution occurs when substances used or spread by humans, such as industrial, agricultural and residential waste, particles, noise, excess carbon dioxide or invasive organisms enter the ocean and cause harmful effects there. The majority of this waste (80%) comes from land-based activity, although marine transportation significantly contributes as well. It is a combination of chemicals and trash, most of which comes from land sources and is washed or blown into the ocean. This pollution results in damage to the environment, to the health of all organisms, and to economic structures worldwide. Since most inputs come from land, either via the rivers, sewage or the atmosphere, it means that continental shelves are more vulnerable to pollution. Air pollution is also a contributing factor by carrying off iron, carbonic acid, nitrogen, silicon, sulfur, pesticides or dust particles into the ocean. The pollution often comes from nonpoint sources such as agricultural runoff, wind-blown debris, and dust. These nonpoint sources are largely due to runoff that enters the ocean through rivers, but wind-blown debris and dust can also play a role, as these pollutants can settle into waterways and oceans. Pathways of pollution include direct discharge, land runoff, ship pollution, bilge pollution, atmospheric pollution and, potentially, deep sea mining.

<span class="mw-page-title-main">Diisobutyl phthalate</span> Chemical compound

Diisobutyl phthalate (DIBP) is a phthalate ester having the structural formula C6H4(COOCH2CH 2)2. It is formed by the esterification of isobutanol and phthalic anhydride. This and other phthalates are used as plasticizers due to their flexibility and durability. They are found in many industrial and personal products, such as lacquers, nail polish and cosmetics. DIBP can be absorbed via oral ingestion and dermal exposure. When it comes to excretion, DIBP is first converted into the hydrolytic monoester monoisobutyl phthalate (MIBP). The primary excretory route is urine, with biliary excretion being noted in minor amounts. DIBP has lower density and freezing point than the related compound dibutyl phthalate (DBP).

<span class="mw-page-title-main">Plastic bottle</span> Narrow-necked container

A plastic bottle is a bottle constructed from high-density or low density plastic. Plastic bottles are typically used to store liquids such as water, soft drinks, motor oil, cooking oil, medicine, shampoo, milk, and ink. The size ranges from very small bottles to large carboys. Consumer blow molded containers often have integral handles or are shaped to facilitate grasping.

<span class="mw-page-title-main">Garbage patch</span> Gyre of marine debris

A garbage patch is a gyre of marine debris particles caused by the effects of ocean currents and increasing plastic pollution by human populations. These human-caused collections of plastic and other debris are responsible for ecosystem and environmental problems that affect marine life, contaminate oceans with toxic chemicals, and contribute to greenhouse gas emissions. Once waterborne, marine debris becomes mobile. Flotsam can be blown by the wind, or follow the flow of ocean currents, often ending up in the middle of oceanic gyres where currents are weakest.

<span class="mw-page-title-main">Marine plastic pollution</span> Environmental pollution by plastics

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<span class="mw-page-title-main">Plastic</span> Material of a wide range of synthetic or semi-synthetic organic solids

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<span class="mw-page-title-main">North Atlantic garbage patch</span> Large floating field of debris in the North Atlantic Ocean

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<span class="mw-page-title-main">Microplastics</span> Extremely small fragments of plastic

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<span class="mw-page-title-main">Health effects of salt</span> Conditions associated with the consumption of either too much or too little salt

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<span class="mw-page-title-main">Plastic pollution</span> Accumulation of plastic in natural ecosystems

Plastic pollution is the accumulation of plastic objects and particles in the Earth's environment that adversely affects humans, wildlife and their habitat. Plastics that act as pollutants are categorized by size into micro-, meso-, or macro debris. Plastics are inexpensive and durable, making them very adaptable for different uses; as a result, manufacturers choose to use plastic over other materials. However, the chemical structure of most plastics renders them resistant to many natural processes of degradation and as a result they are slow to degrade. Together, these two factors allow large volumes of plastic to enter the environment as mismanaged waste which persists in the ecosystem and travels throughout food webs.

<span class="mw-page-title-main">Plastisphere</span> Plastic debris suspended in water and organisms which live in it

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The Shaw Institute, formerly the Marine & Environmental Research Institute, is a 501(c)(3) nonprofit scientific research organization based in Blue Hill, Maine and New York City. The institute conducts research into ocean pollution, flame retardants, microplastics and plastic pollution, sentinel species and climate change.

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<span class="mw-page-title-main">Plastic pollution in the Mediterranean sea</span>

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Microplastics remain a major problem for environmental health in Haiti, particularly their presence in a large quantity of water sources.

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