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Cascade Filtration Coupled with Raman Spectroscopy for Size-Resolved Detection of Micro- and Nanoplastics in Drinking Water
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Scientists tested tap water, bottled water, and even ultra-purified water for tiny plastic particles, and found that every single sample contained them, including plastics too small to see without special equipment. Tap water had the most larger particles, but even the "cleanest" purified water wasn't plastic-free, with common plastics like PET (used in bottles) showing up across the board. This suggests that avoiding plastic contamination in drinking water may be nearly impossible with current filtration methods, highlighting why researchers are pushing for better testing standards to understand what this means for our health.
Micro- and nanoplastics (MNPs) are increasingly recognized as emerging contaminants in drinking water, yet quantitative data remain limited due to analytical challenges. In this study, the occurrence, morphology, and polymer composition of MNPs were investigated in commercial drinking water from Saxony-Anhalt, Germany, including ultrapure water, tap water, and five bottled mineral waters. A dual-stage cascade filtration system combining silicon filters (5 µm pore size) and aluminum oxide membranes (90 nm pore size) was employed for size-selective particle separation. Retained particles were characterized using optical microscopy, scanning electron microscopy (SEM), and Raman spectroscopy. Tap water exhibited the highest concentration of microparticles, whereas ultrapure water showed minimal microparticle contamination. Nanoparticles were detected in all samples, including ultrapure water, with mean particle sizes below 1 µm, highlighting the pervasive nature of nanoscale plastic contamination. Raman analysis identified polyethylene terephthalate (PET) as the most frequently detected synthetic polymer, together with polypropylene (PP), polystyrene (PS), and poly(methyl methacrylate) (PMMA). The results demonstrate that no drinking water source tested in this study was free of detectable MNPs and underline the need for standardized analytical approaches capable of reliably detecting MNPs in drinking water.
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Challenges and solutions in the analysis of micro- and nanoplastics down to 500 nm with automated Raman microspectroscopy: suitable filters, accuracy in the detection, identification, and quantification
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Scientists improved a technique using laser light (Raman microspectroscopy) to detect super-tiny plastic particles in water—as small as 500 nanometers, which is 1,000 times thinner than a human hair. This matters because most microplastic testing misses these ultra-small particles, yet they may be the ones most able to enter our bodies and cells; when the researchers tested actual drinking water, they found plastic particles were surprisingly rare, though more sensitive tools like this will help scientists better understand our real-world exposure and health risks going forward.
Microplastic analysis in drinking water based on fractionated filtration sampling and Raman microspectroscopy
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A validated analytical workflow for detecting microplastics down to 5 µm in drinking water was developed using a portable filter cascade unit followed by two-step semi-automated Raman microspectroscopy, and was applied successfully to processed drinking water, tap water, and groundwater.
What's in your water? A comparative analysis of micro- and nanoplastics in treated drinking water and bottled water
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Researchers developed a novel method to detect both micro- and nanoplastics in drinking water using scanning electron microscopy and advanced infrared spectroscopy capable of identifying particles as small as 300 nanometers. The study found that bottled water had significantly higher concentrations of plastic particles than treated tap water, particularly for smaller micro- and nanoplastics, with polyamide, PET, and polyethylene being the most common polymers.
Microplastics and nanoplastics contamination in raw and treated water
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Researchers analyzed 189 samples of raw, tap, and bottled drinking water for micro- and nanoplastic contamination. They found plastic particles in every sample tested, with raw water sources containing the highest concentrations and treated tap water containing the lowest, though contamination was never fully eliminated. The study suggests that current water treatment processes reduce but do not completely remove plastic particles from drinking water.
Identification of Poly(ethylene terephthalate) Nanoplastics in Commercially Bottled Drinking Water Using Surface-Enhanced Raman Spectroscopy
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Scientists developed a new detection method using enhanced Raman spectroscopy to identify nanoplastics in commercially bottled drinking water. They found PET nanoplastics averaging about 88 nanometers in size in the bottled water samples tested. This study provides concrete evidence that people are consuming nanoplastics through a common daily source, and offers a tool that could help monitor plastic contamination in beverages.
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