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From laboratory to field: A review of portable Raman spectroscopy for real-time microplastic monitoring in aquatic environments
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Tiny plastic particles called microplastics are showing up in water everywhere, but testing for them is slow and usually requires bringing samples back to a lab, which can even accidentally introduce more plastic contamination during handling. This review looked at portable devices that use light (laser) technology to detect microplastics on the spot, finding that while promising, most "portable" tools still need lab-like prep steps and aren't yet truly ready for quick, contamination-free field testing. Faster, more reliable on-site detection would help scientists track plastic pollution in the water we drink and the fish we eat, giving us better information about our exposure to these poll
Microplastics and nanoplastics are recognized as persistent pollutants in aquatic environments, posing ecological and toxicological risks across trophic levels. However, their detection remains analytically challenging. Conventional laboratory-based techniques - Fourier-transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy, and pyrolysis-gas chromatography-mass spectrometry - provide detailed characterization but are constrained by extensive sample preparation, long analysis times, and high contamination risks during sample handling. To overcome these limitations, portable Raman spectroscopy has emerged as a promising approach for in situ MPs detection, enabling direct and rapid identification in aqueous environments. However, a systematic review of the current literature reveals that most applications employing portable Raman instruments still rely on laboratory-based pre-treatment steps, including filtration and artificial spiking of samples, limiting field portability and their real-time analytical potential. Notably, only one study conducted direct in situ field measurements using a portable Raman device. However, even in that case, a filtration step was integrated into the portable setup, introducing potential contamination and undermining the goal of fully field-deployable operation. The reliance on pre-treatments highlights a gap between the promise of portability and its real-world applicability. In response, this review systematically examines recent advances in portable Raman-based detection of MPs and NPs, identifies methodological and instrumental constrains hindering true in situ analysis, while showcasing promising innovations that could enable real-time measurements in liquid matrices. Progress toward fully integrated, contamination-free portable systems will be essential to bridge laboratory-based innovation and on-site monitoring, ultimately facilitating faster and more reliable assessment of plastic pollution in aquatic ecosystems.
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Scientists have designed a smaller, simpler version of a laser-based tool that can identify tiny plastic particles in drinking water, ditching the bulky equipment that normally makes this technology hard to use outside a lab. Early tests show the concept works, though the light-detecting parts need to get better before it's sensitive enough for real-world use. If perfected, this kind of compact device could one day be installed directly in water systems to continuously check for microplastic contamination, helping protect public health without waiting on slow lab testing.
Towards the Development of Portable and In Situ Optical Devices for Detection of Micro-and Nanoplastics in Water: A Review on the Current Status
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This review surveys the development of portable and in-situ optical devices for detecting micro- and nanoplastics in water, as most current detection methods are laboratory-based. Researchers evaluated emerging technologies including portable Raman and infrared spectroscopy, fluorescence-based sensors, and smartphone-integrated detection systems. The study identifies key technical challenges that must be overcome to enable real-time, field-based monitoring of plastic pollution in water.
Field readiness of Raman-AI pipelines for microplastic analysis across environmental matrices
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Scientists are increasingly using laser-based tools paired with AI to detect microplastics in water, food, and other samples, but this review of 61 studies finds these methods are mostly tested in controlled lab settings, not the messy real world. Key checks that would prove the technology works reliably outside the lab (like testing on new equipment or unfamiliar samples) are still rare, meaning the tech isn't quite ready to be trusted for widespread, real-world microplastic monitoring yet. This matters because before we can confidently track how much plastic contamination is in our water and food, the detection tools themselves need to prove they're consistently accur
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This study developed a faster way to measure microplastic concentrations in water by analysing Raman spectral signals directly in solution, skipping the laborious pre-treatment steps required by traditional methods. The concentration of polyethylene particles was found to correlate predictably with Raman signal intensity using a Langmuir model, enabling a simpler field-ready monitoring approach. Rapid detection tools like this are important for tracking microplastic contamination in drinking water and marine environments.
Portable On-Site Optical Detection and Quantification of Microplastics
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Researchers built a portable, on-site optical device to detect and quantify microplastics in water. The device addresses the challenge of detecting small, often translucent particles without a laboratory setting. Portable microplastic detection tools could enable real-time monitoring in the field, supporting faster environmental assessments.
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