Contaminant levels and endocrine disruptive effects in Clarias gariepinus exposed to simulated leachate from a solid waste dumpsite in Calabar, Nigeria

Ibor, Oju R.; Bassey, Andem; Eni, George; Arong, Gabriel A.; Adeougn, Aina O.; Arukwe, Augustine

doi:10.1016/j.aquatox.2019.105375

Cited by 25 publications

(6 citation statements)

References 45 publications

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“…The African sharptooth catfish, C. gariepinus is a highly economical and ecologically relevant fish species [26]. It belongs to the family Clariidae and is a common model fish species utilized for aquatic toxicological studies among other animal experimental studies in Nigeria [27][28][29][30]. The aim of this study was to evaluate the effects of sublethal (environmentally relevant) concentrations of two pesticides (dichlorvos and paraquat) in C. gariepinus for 28 days.…”

Section: Introductionmentioning

confidence: 99%

Sublethal concentrations of dichlorvos and paraquat induce genotoxic and histological effects in the Clarias gariepinus

Oladokun

Sogbanmu

Anikwe

2020

Environ Anal Health Toxicol

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Non-target aquatic organisms such as fish may be impacted by agricultural activities through the runoff of pesticides from farms into aquatic ecosystems. In this study, the genotoxic (erythrocytic micronuclei) and histological effects of sublethal concentrations (1% and 10% of 96-h median lethal concentration (LC50) values) of two pesticides (dichlorvos and paraquat) were evaluated in Clarias gariepinus (the African Sharptooth Catfish) for 28 days. The 96-h LC50 of dichlorvos and paraquat against fingerlings of C. gariepinus was 730 µg/L and 50 µg/L, respectively. There was a significant dose-dependent increase (p<0.05) in micronuclei in the erythrocytes of exposed C. gariepinus (2.00±0.82 ‰ to 3.25±1.26 ‰ for dichlorvos and 2.25±0.96 ‰ to 4.75±0.96 ‰ for paraquat) compared to control (0.75±0.96 ‰) by day 28. Gill histological alterations such as mild to severe necrosis and blunting of secondary lamellae were observed in C. gariepinus exposed to higher sublethal concentrations of both pesticides. This study showed that non-target aquatic organisms like C. gariepinus may be at risk of adverse biological effects from exposure to pesticides from non-point sources. We recommend environmental monitoring and sensitization on responsible pesticide use to stakeholders. This will forestall potential adverse ecological effects in aquatic ecosystems.

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Section: Introductionmentioning

confidence: 99%

Sublethal concentrations of dichlorvos and paraquat induce genotoxic and histological effects in the Clarias gariepinus

Oladokun

Sogbanmu

Anikwe

2020

Environ Anal Health Toxicol

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“…Possibilities of escape of contaminants such as BDEs into subsoil were reported by Olutona et al and Oloruntoba et al, particularly for lower brominated congeners [35,36] . Contaminants of PBDEs and PCBs were reported in groundwater sources around landfills, heavily implying emissions from these sites [42,49] .…”

Section: Factors Influencing Releases Of Contaminants From African Wa...mentioning

confidence: 99%

“…The authors observed a possible positive relationship between trace metal concentrations and PBDE concentrations in leachate samples. Ololade et al reported concentrations of ∑ 14 PCBs (3.0-41 ng/L) in leachate samples collected from Lagos (Olusosun) and two other dumpsites at Ondo (dumpsite of Ondo State Waste Management Authority) and Ikare-Akoko[49] . These dumpsites were reported not to have any protective liner.…”

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confidence: 99%

Waste streams as current sources of persistent organic pollutants and organophosphate esters in Africa - a critical review

Akinrinade¹,

Stubbings²

2022

J Environ Expo Assess

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Per- and polyfluoroalkyl substances, chlorinated paraffins, brominated flame retardants, polychlorinated biphenyls and mirex are regulated under the United Nations Environment Programme’s (UNEP’s) Stockholm Convention on Persistent Organic Pollutants (POPs) intended for the eradication of hazardous contaminants in the environment. There is also a major concern for organophosphate esters and specific alternative or novel brominated flame retardants. To date, no evidence exists that major producers of these chemicals occur on the African continent. They are understood to find their way into African environments through the import of commercial products, in particular products with second-hand value and short lifespans, which may enter waste streams in a relatively shorter period. To further understand the current levels of these selected contaminants in African waste streams, existing documents capturing various African waste stream compartments for the above outlined targeted contaminants were gathered from an exhaustive literature review. Key factors influencing the transfer of contaminants from waste or elevated concentrations of contaminants in African waste streams are associated with the nature and/or sources of contaminants, volume of contaminants or waste in relation to the capacity of treatment plants/landfills, condition or age of treatment plants/landfill geomembrane liner, model adopted for contaminants removal and treatment procedures for collected sludges or leachates. Evidence from the selected studies indicates substantial POP contamination in African landfills and dumpsites, wastewater effluents/sludge and human/biological samples around dumpsites and landfills. Unfortunately, the continent has inadequate infrastructural capacity to adequately handle POP in the waste streams. This review provides recommendations and suggestions for future studies.

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“…Due to the di cult biodegradability of solid wastes containing uoropolymers, the resource utilization of waste PVDF membranes has always been a major issue affecting the ecological environment and human health [9,10]. Conventional incineration or land ll disposal of waste PVDF polymers not only causes environmental pollution but also wastes resources of PVDF polymers [11,12]. In recent years, many researchers have also developed their resource disposal methods, including recycling PVDF membranes as raw materials for membrane production [13], adding new llers to assist in the preparation of high-capacitance carbon materials [14], and using degradation methods to recover F elements and prepare oil-water separation sponges [15].…”

Section: Introductionmentioning

confidence: 99%

Influence of PAO@PSF microcapsules on the tribological properties of polyvinylidene fluoride matrix recovered from waste membranes

Liang

et al. 2023

Preprint

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In the study, the waste polyvinylidene fluoride (PVDF) membranes were recovered and the micropowders of this polymer were obtained by solvent recovery method. Moreover, the new direction for applying waste PVDF membranes to the field of tribology were developed. Thus, a novel PVDF-based tribological composite (PAO@PSF/PVDF) was fabricated with recycled PVDF micropowders acted as the matrix polymer and PAO@PSF microcapsules with the configuration of polysulfone (PSF) capsuling lubricant oil (PAO) served as the filler. The self-lubricating and wear properties of PAO@PSF/PVDF composite were tested under dry sliding condition using a ball-on-disc configuration. In particular, this kind of composite with the inclusion of 20 wt% PAO@PSF microcapsules exhibited the best tribological properties, i.e., the lowest friction coefficient (0.077) and the smallest wear rate (2.34×10-15 m3/Nm). The filling of PAO@PSF microcapsules greatly improved the antifriction and wear resistance of PVDF, guaranteeing the self-lubricating feature of this polymer. The tribological properties of PAO@PSF/PVDF composite can reach close to those under the condition of dripping lubricating oil, and the prepared PAO@PSF/PVDF self-lubricating composite can be applied to a large range of friction conditions. Furthermore, without any doubt, it will facilitate the reutilization of waste polymers.

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Contaminant levels and endocrine disruptive effects in Clarias gariepinus exposed to simulated leachate from a solid waste dumpsite in Calabar, Nigeria

Cited by 25 publications

References 45 publications

Sublethal concentrations of dichlorvos and paraquat induce genotoxic and histological effects in the Clarias gariepinus

Sublethal concentrations of dichlorvos and paraquat induce genotoxic and histological effects in the Clarias gariepinus

Waste streams as current sources of persistent organic pollutants and organophosphate esters in Africa - a critical review

Influence of PAO@PSF microcapsules on the tribological properties of polyvinylidene fluoride matrix recovered from waste membranes

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