Impacts of baseflow and flooding on microplastic pollution in an effluent-dependent arid land river in the USA

Eppehimer, Drew E.; Hamdhani, Hamdhani; Hollien, Kelsey D.; Nemec, Zach C.; Lee, Larissa N.; Quanrud, David M.; Bogan, Michael T.

doi:10.1007/s11356-021-13724-w

Cited by 15 publications

(5 citation statements)

References 74 publications

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“…After the runoff less MP was found in sediments, but more in the water column. In particular, less fibers were found after the flood, they seem to be easily mobilized and get less attached by biofilms than fragments [67,68]. Runoff mobilizes plastic particles in sediments and floods are a transport medium while no or low flow conditions cause deposition of MP [69,70].…”

Section: Mp Concentrations In Namibiamentioning

confidence: 99%

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Microplastics in Namibian river sediments – a first evaluation

et al. 2022

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The African continent is rarely the focus of microplastics research, although the ubiquity of microplastics in the environment is undisputed and still increasing. Due to the high production and use of plastic products and the partial lack of recycling systems in many parts of the African continent, it can be assumed that microplastic particles are already present in limnic and terrestrial ecosystems. Few studies, mainly from South Africa and the Northern African region, show a contamination with microplastics, especially in marine environments. This study aims to explore the presence and composition of microplastics in fluvial sediments of the major catchments in Namibia with a regional focus on the Iishana system in Northern Namibia, as one of the most densely populated areas in the country. In March 2019 and March 2021, at the end of the rainy seasons, sediments from the Iishana system and of the largest river catchments were sampled. Extraction was performed by density separation using the Microplastic Sediment Separator (MPSS) with the separation solution sodium chloride (density of 1.20 g/cm3). The particle size was determined by filtration and fractionation, and the polymer type by measurement with ATR-FTIR spectroscopy (minimum particle size 0.3 mm). Microplastics were found in the sediments of each river system, most of the particles in the Iishana system (average of 13.2 particles/kg dry weight). The perennial, the ephemeral rivers, and the Iishana system are similar concerning polymer type and particle size. Polyethylene and polypropylene were the dominant polymer types. Most of the particles were found in the size fractions 0.3 – 0.5 mm and 0.5 – 1.0 mm. The particles were found mainly as fragments and films, the majority transparent and brown.

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Section: Mp Concentrations In Namibiamentioning

confidence: 99%

“…There are nearly no studies on MP in ephemeral systems. Eppehimer et al [67] investigated the ephemeral Santa Cruz River in the USA. They identified differences between the base flow of the river, caused by water treatment plants, and the post-flood conditions, after rainfall events.…”

Section: Mp Concentrations In Namibiamentioning

confidence: 99%

Microplastics in Namibian river sediments – a first evaluation

et al. 2022

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“…Additionally, in the same study Hurley et al ( 2018 ) noted a decline in MP concentrations in 28 out of 40 river sites following a major flood event (mean pre-flood 7,036 items/kg; post-flood 889 items/kg), showing that MP contamination can substantially change following flooding. Eppehimer et al ( 2021 ) found similar results for MP concentrations after a flood in the Santa Cruz River near Tucson, Arizona.…”

Section: Resultsmentioning

confidence: 68%

Microplastic in Dredged Sediments: From Databases to Strategic Responses

Wilkens,

Calomeni-Eck,

Boyda

et al. 2024

Bull Environ Contam Toxicol

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Microplastics (MPs) accumulate in sediments, yet guidelines for evaluating MP risks in dredged sediments are lacking. The objective of this study was to review existing literature on MPs in sediments to improve fundamental knowledge of MP exposures and develop a publicly available database of MPs in sediments. Twelve percent of the reviewed papers (nine studies) included sediment core samples with MP concentrations generally decreasing with depth, peaking in the top 15 cm. The remaining papers evaluated surficial grab samples (0 to 15 cm depth) from various water bodies with MPs detected in almost every sample. Median MP concentrations (items/kg dry sediment) increased in this order: lakes and reservoirs (184), estuarine (263), Great Lakes nearshore areas and tributaries (290), riverine (410), nearshore marine areas (487), dredge activities (817), and harbors (948). Dredging of recurrent shoaling sediments could be expected to contain MPs at various depths with concentrations influenced by the time elapsed since the last dredging event. These results offer key insights into the presence and variability of MPs in dredged sediments, informing environmental monitoring and risk assessment strategies.

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“…Using a 10× -45× magnification dissecting microscope, microplastic particles in the processed digestive tract contents were identified and enumerated. The microplastic particles were observed and categorized into 4 major types (fiber, fragment, film and bead; [40]) following protocols from Hidalgo-Ruz et al [41]; Eppehimer et al [42]. To minimize contamination by airborne synthetic fibers during sampling processing, the researchers wore 100 % cotton lab cloth.…”

Section: Laboratory Processingmentioning

confidence: 99%

¬Occurrence of Microplastic Ingestion by Commercial Fish Species from the Pangempang Estuary in Indonesia

Hamdhani,

Ghitarina,

Eryati

et al. 2024

Trends Sci

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The aim of this study was to assess the occurrence of microplastic in digestive organs (esophagus to intestine) of popular marine commercial fish species: Jack (Caranx SP.), blackspot snapper (Lutjanus fulviflamma), coral grouper (Epinephelus carallicala), golden snapper (Lutjanus johnii) and pickhandle barracuda (Sphyraena jello) from Pangempang Estuary in Indonesia. To separate the microplastic particles, each sample was digested using alkaline digestion solution, filtered on Whatman paper and then dried. Microplastic particles in the processed digestive organ contents were identified and enumerated using a dissecting stereo microscope. Microplastics were observed in 94 % of fish digestive organs sampled: 100 % jacks (n = 10), 80 % blackspot snapper (n = 10), 100 % coral grouper (n = 10), 90 % golden snapper (n = 10) and 100 % pickhandle barracuda (n = 10). In these fish samples we found in average of 41 ± 6.0, 26 ± 11.0, 15 ± 2.0, 11 ± 1.0 and 14 ± 2.0 SE microplastic particles per individual and an average of 499.5 ± 94.4, 501.5 ± 198.8, 83.6 ± 18.4, 79.8 ± 11.6 and 40.2 ± 25.0 SE microplastic particles per kg fish weight, in jacks, blackspot snapper, coral grouper, golden snapper and pickhandle barracuda, respectively. Fiber was the most dominant type accounting for 78.6 % of all observed microplastics. Microplastic beads were not detected. The correlation of the average consumed microplastic and the average fish weight per species showed a negative relationship (R2 = 0.36), but was not significant (p-value = 0.28). Our finding suggests that demersal fish like jacks, blackspot snapper and coral grouper may have ingested a higher quantity of microplastic particles compared to pelagic species like pickhandle barracuda. HIGHLIGHTS This study demonstrates the presence of microplastic particles in 5 commercially important fish in a tropical estuary of Kalimantan Island in Indonesia Fiber was the most dominant type of microplastic Demersal fish may have ingested a higher quantity of microplastic particles compared to pelagic species GRAPHICAL ABSTRACT

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Impacts of baseflow and flooding on microplastic pollution in an effluent-dependent arid land river in the USA

Cited by 15 publications

References 74 publications

Microplastics in Namibian river sediments – a first evaluation

Microplastics in Namibian river sediments – a first evaluation

Microplastic in Dredged Sediments: From Databases to Strategic Responses

¬Occurrence of Microplastic Ingestion by Commercial Fish Species from the Pangempang Estuary in Indonesia

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