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Article ? AI-assigned paper type based on the abstract. Classification may not be perfect — flag errors using the feedback button. Tier 2 ? Original research — experimental, observational, or case-control study. Direct primary evidence. Detection Methods Policy & Risk Sign in to save

Identification of microplastics in a large water volume by integrated holography and Raman spectroscopy

Applied Optics 2020 45 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 35 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.
Tomoko Takahashi, Tomoko Takahashi, Sumeet Mahajan, Tomoko Takahashi, Thangavel Thevar, Dhugal J. Lindsay, Nicholas Burns, Dhugal J. Lindsay, Thangavel Thevar, Thangavel Thevar, Zonghua Liu, Dhugal J. Lindsay, Thangavel Thevar, Tomoko Takahashi, Dhugal J. Lindsay, Dhugal J. Lindsay, John Watson, Nicholas Burns, Sumeet Mahajan, Sumeet Mahajan, Dhugal J. Lindsay, John Watson, Dhugal J. Lindsay, Blair Thornton Sumeet Mahajan, Dhugal J. Lindsay, Dhugal J. Lindsay, Dhugal J. Lindsay, Blair Thornton

Summary

A new technique combining holography and Raman spectroscopy was demonstrated to identify plastic pellets suspended in a large volume of water without physical contact. This non-destructive approach could enable real-time, in-water microplastic detection for environmental monitoring.

Polymers
PS

A noncontact method to identify sparsely distributed plastic pellets is proposed by integrating holography and Raman spectroscopy in this study. Polystyrene and poly(methyl methacrylate) resin pellets with a size of 3 mm located in a 20 cm water channel were illuminated using a collimated continuous wave laser beam with a diameter of 4 mm and wavelength of 785 nm. The same laser beam was used to take a holographic image and Raman spectrum of a pellet to identify the shape, size, and composition of material. Using the compact system, the morphological and chemical analysis of pellets in a large volume of water was performed. The reported method demonstrates the potential for noncontact continuous in situ monitoring of microplastics in water without collection and separation.

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