Microplastic accumulation in endorheic river basins – The example of the Okavango Panhandle (Botswana)

Kelleher, Liam; Schneidewind, Uwe; Krause, Stefan; Haverson, Lee; Allen, Steve; Allen, Deonie; Kukkola, Anna; Murray-Hudson, Mike; Maselli, Vittorio; Franchi, Fulvio

doi:10.1016/j.scitotenv.2023.162452

Cited by 14 publications

(8 citation statements)

References 71 publications

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“…Kelleher et al. (2023) also examined the concentration of MPs in the Okavanga Panhandle in Northern Botswana, the first ever study in the Okavango delta.…”

Section: Resultsmentioning

confidence: 99%

“…A few studies have also relied on 30% (v/v) (Oni et al. , 2020; Bobadilla et al., 2019; Kelleher et al. , 2023; Saad et al.…”

Section: Resultsmentioning

confidence: 99%

“…, 2019; Akindele, 2020; Akindele and Alimba, 2021). In addition to hydrogen peroxide (H 2 O 2 ), Kelleher et al. (2023) used ZnCl 2 and Fenton reagent to dissolve organic matter.…”

Section: Resultsmentioning

confidence: 99%

“…A few studies have also relied on 30% (v/v) (Oni et al, 2020;Bobadilla et al, 2019;Kelleher et al, 2023;Saad et al, 2022) and 34.5-36.5 (v/v) of hydrogen peroxide (H 2 O 2 ) to dissolve organic substances (Akindele et al, 2019;Akindele, 2020;Akindele and Alimba, 2021). In addition to hydrogen peroxide (H 2 O 2 ), Kelleher et al (2023) used ZnCl 2 and Fenton reagent to dissolve organic matter. We found two studies that instead used nitric acid (55%) or sodium hydroxide (NaOH) (1M, 20 ml) (Kosore et al, 2018) for organic matter digestion.…”

Section: Mps Sampling Extraction and Identification Methodsmentioning

confidence: 99%

“…Reported mean concentration of MPs in different African freshwater systems is detailed in Table 2. Kelleher et al (2023) also examined the concentration of MPs in the Okavanga Panhandle in Northern Botswana, the first ever study in the Okavango delta. MP abundance in the grain size of 20 μm to 5 mm ranged from 1075.7 to 1756.3 particles kg À1 , and the dominant polymers included PET, PP, PE, PS and PVC.…”

Section: Review Of Microplastic Pollution In Africamentioning

confidence: 99%

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Microplastic pollution in Africa: an overview of abundance in aquatic organisms, freshwater and marine water environments and analytical methods for reporting

Asori,

Dogbey,

Ampofo

et al. 2023

MEQ

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PurposeCurrent evidence indicates that humans and animals are at increased risk of multiple health challenges due to microplastic (MP) profusion. However, mitigation is constrained by inadequate scientific data, further aggravated by the lack of evidence in many African countries. This review therefore synthesized evidence on the current extent of MP pollution in Africa and the analytical techniques for reporting.Design/methodology/approachA literature search was undertaken in research databases. Medical subject headings (MeSH) terms and keywords were used in the literature search. The authors found 38 studies from 10 countries that met the inclusion criteria.FindingsMarine organisms had MPs prevalence ranging from 19% to 100%, whereas sediments and water samples had between 77 and 100%. The most common and dominant polymers included polypropylene and polyethylene.Practical implicationsThis review shows that most studies still use methods that are prone to human errors. Therefore, the concentration of MPs is likely underestimated, even though the authors’ prevalence evaluations show MPs are still largely pervasive across multiple environmental matrices. Also, the study reveals significant spatial disparity in MP research across the African continent, showing the need for further research in other African countries.Originality/valueEven though some reviews have assessed MPs pollution in Africa, they have not evaluated sample prevalence, which is necessary to understand not only concentration but pervasiveness across the continent. Secondly, this study delves deeper into various methods of sampling, extraction and analysis of MPs, as well as limitations and relevant recommendations.

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“…Kelleher et al. (2023) also examined the concentration of MPs in the Okavanga Panhandle in Northern Botswana, the first ever study in the Okavango delta.…”

Section: Resultsmentioning

confidence: 99%

“…A few studies have also relied on 30% (v/v) (Oni et al. , 2020; Bobadilla et al., 2019; Kelleher et al. , 2023; Saad et al.…”

Section: Resultsmentioning

confidence: 99%

“…, 2019; Akindele, 2020; Akindele and Alimba, 2021). In addition to hydrogen peroxide (H 2 O 2 ), Kelleher et al. (2023) used ZnCl 2 and Fenton reagent to dissolve organic matter.…”

Section: Resultsmentioning

confidence: 99%