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

Tomoko Takahashi; Zonghua Liu; Thangavel Thevar; Nicholas Burns; Sumeet Mahajan; Dhugal Lindsay; John Watson; Blair Thornton

doi:10.1364/AO.393643

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

Tomoko Takahashi^* (Corresponding Author), Zonghua Liu, Thangavel Thevar, Nicholas Burns, Sumeet Mahajan, Dhugal Lindsay, John Watson, Blair Thornton

^*Corresponding author for this work

Engineering

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

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Abstract

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.

Original language	English
Pages (from-to)	5073-5078
Number of pages	6
Journal	Applied Optics
Volume	59
Issue number	17
Early online date	2 Jun 2020
DOIs	https://doi.org/10.1364/AO.393643
Publication status	Published - 10 Jun 2020

Bibliographical note

Funding
Japan Science and Technology Agency SICORP (JPMJSC1705); Natural Environment Research Council (NE/R01227X/1); Kajima Foundation (Overseas research grant); Japan Society for the Promotion of Science (18H03810, 18K13934); Kurita Water and Environment Foundation (17B030).

Keywords

MARINE-ENVIRONMENT
SEA
SPECTROMETER
OCEAN
SPECTRA

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10.1364/AO.393643Licence: CC BY

Takahashi_et_al_AppOpt_IdentificationOfMicroplastics_VoR
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Final published version, 1.35 MBLicence: CC BY

Cite this

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title = "Identification of microplastics in a large water volume by integrated holography and Raman spectroscopy",

abstract = "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.",

keywords = "MARINE-ENVIRONMENT, SEA, SPECTROMETER, OCEAN, SPECTRA",

author = "Tomoko Takahashi and Zonghua Liu and Thangavel Thevar and Nicholas Burns and Sumeet Mahajan and Dhugal Lindsay and John Watson and Blair Thornton",

note = "Funding Japan Science and Technology Agency SICORP (JPMJSC1705); Natural Environment Research Council (NE/R01227X/1); Kajima Foundation (Overseas research grant); Japan Society for the Promotion of Science (18H03810, 18K13934); Kurita Water and Environment Foundation (17B030).",

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month = jun,

day = "10",

doi = "10.1364/AO.393643",

language = "English",

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pages = "5073--5078",

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AU - Takahashi, Tomoko

AU - Liu, Zonghua

AU - Thevar, Thangavel

AU - Burns, Nicholas

AU - Mahajan, Sumeet

AU - Lindsay, Dhugal

AU - Watson, John

AU - Thornton, Blair

N1 - Funding Japan Science and Technology Agency SICORP (JPMJSC1705); Natural Environment Research Council (NE/R01227X/1); Kajima Foundation (Overseas research grant); Japan Society for the Promotion of Science (18H03810, 18K13934); Kurita Water and Environment Foundation (17B030).

PY - 2020/6/10

Y1 - 2020/6/10

N2 - 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.

AB - 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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KW - OCEAN

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JO - Applied Optics

JF - Applied Optics

IS - 17

ER -

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

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Thangavel Thevar

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

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Thangavel Thevar

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