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Cascade Filtration Coupled with Raman Spectroscopy for Size-Resolved Detection of Micro- and Nanoplastics in Drinking Water
Summary
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.