Identification and visualisation of microplastics by Raman mapping

Sobhani, Zahra; Amin, Al; Naidu, Ravi; Megharaj, Mallavarapu; Fang, Cheng

doi:10.1016/j.aca.2019.05.021

Cited by 190 publications

(103 citation statements)

References 34 publications

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“…Vianello identified MPs from the Venetian lagoon sediments of 1 mm or less by µFTIR, the most frequent size (93% of observed MPs) was in the range 30-500 µm, and up to 70% of particles was erroneously identified as MPs through FTIR analysis [2]. Sobhani implemented Raman to map MP towards their identification and visualisation, with a lateral resolution down to 1 µm, but the technique of Raman spectroscopy would be interrupted by the presence of color, additives and attached contaminants MPs [17]. SEM is also used for identification of MPs, and provides high-magnification and clearer structural images of MPs.…”

Section: Introductionmentioning

confidence: 99%

Pollution Characteristics of Microplastics in Soils in Southeastern Suburbs of Baoding City, China

Liang

et al. 2020

IJERPH

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Microplastics (MPs) are emerging pollutants that exist in different environmental media. Because of their wide range and large potential environmental hazards, they have attracted widespread attention in recent years. At present, the research on MP is mostly concentrated on the water ecosystems, and the impact on soil ecosystems is less studied. In this study, 12 typical soil samples from southeastern suburbs of Baoding city were investigated and characterized by time-of-flight secondary ion mass spectrometry (TOF-SIMS) combined with mass high resolution mode and positive and negative ion imaging mode. Four types of MPs, poly (propylene) (PP), poly (vinyl chloride) (PVC), poly (ethylene terephthalate) (PET), and poly (amide 6) (PA6), were quickly identified, of which PET and PA6 accounted for the largest proportion of both up to 30.2%; the particle size of the obtained MPs ranged from 0 to 35 μm, of which the proportion of <10 μm MPs was more than 26.3%, while that of 20–25 μm and 25–35 μm MPs was relatively small (17.83% and 9.3%, respectively). Risk assessment results of the MP in the soil showed that the risk level of MPs in the non-ferrous metal industrial parks and in concentrated with small workshops areas is relatively high, and attention should be paid to such areas. In addition, the study provides a reference method for the investigation and risk assessment of MPs in terrestrial soils, coastal beaches, and sediments.

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Section: Introductionmentioning

confidence: 99%

Pollution Characteristics of Microplastics in Soils in Southeastern Suburbs of Baoding City, China

Liang

et al. 2020

IJERPH

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“…A major concern related to Raman spectroscopy is its extremely small scattering cross section, which may produce weak signal (Schwaferts et al, 2020). So, in terms of the resolution Raman is one step ahead from IR as for the excitation the laser's short wavelength is produced (Sobhani et al, 2019). In order to visualize the small particles and enhance the Raman scattering, tip-enhanced Raman scattering (TERS) can be used.…”

Section: Introductionmentioning

confidence: 99%

Microplastics contamination in the soil from Urban Landfill site, Dhaka, Bangladesh

Afrin

Uddin

Rahman

2020

Heliyon

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Microplastics (MP) pollution has become a matter of global concern because of its several deleterious effects on environmental health, especially on the terrestrial environment. The evidence of MP contamination in terrestrial environment is less explored compared to aquatic bodies. However, in Bangladesh despite having high possibility of MP contamination, there is lacking of available research-based evidence. Urban areas soil is subjected to act as a major environmental reservoir for MPs. Thus, this study was carried out to investigate the presence of MP contamination in constructed landfill sites near Dhaka city, Bangladesh. Ten unmixed soil samples were collected from the Aminbazar Sanitary landfill sites, from that thirty replicated samples were investigated via Fourier Transform Infrared Spectroscopy (FT-IR) analysis and Stereomicroscope. The range of physicochemical parameters were found in the soil samples as follows: moisture content; 15.84%-56.54%; soil pH; 5.76-6.02, electric conductivity; 0.1 μs/cm-2.43 μs/cm, alkalinity; 6.7 AE 1.528-14.33 AE 0.577, TOC; 0.18% AE 0.02-1.09 AE 0.03. Among the ten samples, 3 samples were identified to have the presence of MP in the form of Low density polyethylene (LDPE), High density polyethylene (HDPE), and Cellulose acetate (CA) respectively. The detection limit ranged from 1-2000 μm. Hence, the results show that the procurement and discharge of MPs in the landfills is an overlong process. The results of this study provide an initial evidence and affirm that landfill can be a potential source of MPs. This study indicates that MPs are comparatively overlong outcome of human induced activities which can significantly cause changes in terrestrial ecosystems.

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“…A aplicação de técnicas espectroscópicas vibracionais na investigação de diferentes espécies químicas de relevância ambiental, biológica, na construção civil e em patrimônio histórico-cultural tem crescido significantemente nos últimos anos, pois são técnicas que apresentam elevada sensibilidade e não necessitam de grande quantidade amostra. Como exemplos recentes, o emprego da microscopia Raman na identificação de minerais em rochas, 18 na análise de pele humana associada à quimiometria para estudo da ação de produtos de cuidados pessoais, 19 na caracterização de cimento preparado a partir do reuso de escória de alto forno, 20 na identificação de microplásticos poluentes de ambientes aquáticos e águas minerais, 21 na determinação da penetração de corantes em camadas protetoras de óxido de alumínio poroso, 22 etc. As análises empregando a espectroscopia Raman são rápidas, não necessitam de preparação de amostra e apresentam um espectro característico para cada substância, sendo chamada de impressão digital da molécula.…”

Section: Introductionunclassified

Investigação Do Solvatocromismo E Ionocromismo Do Corante Azul Do Nilo Através Das Espectroscopias Raman, Infravermelho E Uv-Vis

Souza

Cório

2019

Quím. Nova

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SOLVATOCHROMISM AND IONOCHROMISM OF THE NILE BLUE DYE A THROUGH RAMAN, INFRARED AND UV-VIS SPECTROSCOPIES. The present work presents the systematic study of Nile Blue A (NB) dye, a cationic textile dye, through electronic and vibrational spectroscopies (Raman, resonant Raman scatter and infrared absorption) in the presence of distinct anions (chloride, bromide, perchlorate and sulfate) and protic and aprotic solvents of different polarities (water, ethanol, acetone, acetonitrile, chloroform and ethyl acetate). There were vibrational changes resulting from the formation and destruction of aggregates according to the chemical environment, besides the formation of a molecular conformation with higher energy in apolar aprotic solvents.

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Identification and visualisation of microplastics by Raman mapping

Cited by 190 publications

References 34 publications

Pollution Characteristics of Microplastics in Soils in Southeastern Suburbs of Baoding City, China

Pollution Characteristics of Microplastics in Soils in Southeastern Suburbs of Baoding City, China

Microplastics contamination in the soil from Urban Landfill site, Dhaka, Bangladesh

Investigação Do Solvatocromismo E Ionocromismo Do Corante Azul Do Nilo Através Das Espectroscopias Raman, Infravermelho E Uv-Vis

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