Urbanization and hydrological conditions drive the spatial and temporal variability of microplastic pollution in the Garonne River

Carvalho, Aline Reis de; Garcia, Flavien; Riem-Galliano, Louna; Tudesque, Loïc; Albignac, Magali; Halle, Alexandra ter; Cucherousset, Julien

doi:10.1016/j.scitotenv.2020.144479

Cited by 96 publications

(37 citation statements)

References 83 publications

(102 reference statements)

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“…Downstream 2 presented the highest MF (229.8%) and MP concentrations (318.0%) (Figure 3) and the highest variability between minimum and maximum values (Table 1). Carvalho et al, 2021;Kataoka et al, 2019;Wong et al, 2020). The concentrations we found are comparable to those found in Cooks River, Australia (between 0.4 and 17.4 items/L, Hitchcock, 2020) and in the Maozhou River, China (between 3.5 and 25.5 items/L, Wu et al, 2020).…”

Section: Microfiber and Microplastic Concentrationssupporting

confidence: 84%

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Microplastic and microfiber fluxes in the Seine River: Flood events versus dry periods

Treilles

Gaspéri

Tramoy

et al. 2022

Science of The Total Environment

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Section: Microfiber and Microplastic Concentrationssupporting

confidence: 84%

“…Several studies have observed higher concentrations of microlitter during low-flow periods than in high-flow conditions (de Carvalho et al, 2021;Rodrigues et al, 2018;Watkins et al, 2019;Wu et al, 2020). This difference in concentrations was attributed to a dilution effect.…”

Section: Introductionmentioning

confidence: 97%

Microplastic and microfiber fluxes in the Seine River: Flood events versus dry periods

Treilles

Gaspéri

Tramoy

et al. 2022

Science of The Total Environment

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“…At the same time in rainy season, 98.78% of the microplastics were of size less than 1 mm and 1.2% were of size 1–5 mm (Table 3 ). Size of microplastics is driven by seasonal hydrological conditions where smaller microplastics increase in low discharge condition (de Carvalho et al 2021 ). In addition, concentration of microplastics increases with decreasing size of microplastics (Su et al 2020 ).…”

Section: Resultsmentioning

confidence: 99%

Microplastic pollution in urban Lake Phewa, Nepal: the first report on abundance and composition in surface water of lake in different seasons

Malla-Pradhan

Suwunwong

Phoungthong

et al. 2022

Environ Sci Pollut Res

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Microplastics are man-made pollutants which have been detected in surface water and groundwater. Research on microplastic concentration in aquatic environment is attracting scientists from developing countries, but in Nepal no information regarding microplastic in freshwater system is available. Therefore, this study investigates the presence and abundance of microplastic in lake surface water of Phewa Lake, the second largest lake in Nepal. The average concentration of microplastic for surface water was 2.96 ± 1.83 particles/L in winter (dry) season and 1.51 ± 0.62 particles/L in rainy (wet) season. Significant difference with t = 4.687 ( p < 0.01) in microplastic concentration was observed in two different seasons. Fibers (93.04% for winter and 96.69% for rainy season) were the commonly found microplastic type in lake water and transparent as the dominant color for the two seasons. Almost all the detected microplastic were found to be < 1 mm in size. Due to the small size of microplastic and unavailability of micro-Fourier transform infrared spectroscopy (μ-FTIR) and Raman spectroscopy in Nepal, polymer identification was not done. The findings from this study can provide a valuable baseline data on microplastics for the first time in Nepal’s freshwater lake environment. Supplementary Information The online version contains supplementary material available at 10.1007/s11356-021-18301-9.

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“…9 , only for pellets from Sigma Aldrich), indicating carboxylic acid and alcohol functional groups (R-OH stretching, 3000–3500 cm −1 ) [27] , all particles were unequivocally identified ( Fig. 8 ) [4] . Similarly, no significant mass changes occurred (Kruskal test, χ 2 = 1.495, p = 0.474), excepted for the two PET batches from Sigma Aldrich ( Supplementary Table S1 ), where a significant mass loss of 17.0% (± 5.18 SD) was observed (Kruskal test, χ 2 = 15.699, p = 0.003).…”

Section: Customization and Verification Essaymentioning

confidence: 96%

“…pyrolysis coupled to gas chromatography and mass spectrometry (pyr-GC–MS) [9 , 30] . In the case of smaller microplastics, it is also important to be careful with mesh size in sampling devices as they can lead to net clogging and underestimation of microplastic pollution [4] . Finally, to ensure the robustness of future microplastic pollution monitoring, we also identify a need to improve our knowledge related to the initial step of the process, i.e.…”

Section: Applying the Protocol To Microplastic Pollution Monitoringmentioning

confidence: 99%

Protocol for microplastic pollution monitoring in freshwater ecosystems: Towards a high-throughput sample processing - MICROPLASTREAM

et al. 2021

Self Cite

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Robust and reproducible quantification of microplastic pollution in freshwater ecosystems requires the processing of a large amount of samples collected in varying environmental conditions. Such samples are characterized by a high amount of organic matter compared to microplastics and are highly variable in terms of the quantity and the composition of matrices, requiring a standardized analytical protocol for sample treatment and analysis. However, two important and time-consuming steps for microplastic recovery are the elimination of organic matter and microscopic inspection of samples. Here, we developed and validated a protocol, targeting particles with length ranging from 700 µm to 5 mm, that includes a double-step digestion of organic matter, consisting of incubation with potassium hydroxide followed by hydrogen peroxide solutions, and two stereomicroscopic analyses. In addition, we developed several technical improvements allowing reducing the time needed to process samples, such as the design of an adapted filter-cap to improve the content transfer. The absence of physical and chemical alterations in the investigated microplastic pellets and the average reduction of 65.8% (± 9.59 SD) of organic matter in real samples demonstrated that our protocol is fit for purpose. We recommend a second stereomicroscopic analysis to avoid underestimating microplastic concentration and particle size distribution biased towards larger particles. When used for a large-scale monitoring of microplastic pollution, this protocol resulted in an estimated time of 38 h for one person for the treatment of a batch of 24 samples, allowing a higher throughput sample processing and reproducible quantification. • Protocol customization towards high-throughput sample processing • Double step digestion to improve organic matter elimination • Importance of stereomicroscopic analysis for microplastic recovery

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Urbanization and hydrological conditions drive the spatial and temporal variability of microplastic pollution in the Garonne River

Cited by 96 publications

References 83 publications

Microplastic and microfiber fluxes in the Seine River: Flood events versus dry periods

Microplastic and microfiber fluxes in the Seine River: Flood events versus dry periods

Microplastic pollution in urban Lake Phewa, Nepal: the first report on abundance and composition in surface water of lake in different seasons

Protocol for microplastic pollution monitoring in freshwater ecosystems: Towards a high-throughput sample processing - MICROPLASTREAM

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