Accumulation of organochlorine pesticides in fat tissue of wild Nile crocodiles (Crocodylus niloticus) from iSimangaliso Wetland Park, South Africa

Buah-Kwofie, Archibold; Humphries, Marc; Combrink, Xander; Myburgh, Jan G.

doi:10.1016/j.chemosphere.2017.12.084

Cited by 33 publications

(11 citation statements)

References 41 publications

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“…For quantitative degradation different parameters were optimized. Under sunlight and dark exposure, batch tests comprised varied pesticide concentrations (50-90 mg L À 1 ), catalyst dosage (20-40 mg), and starting pH (3)(4)(5)(6)(7)(8)(9)(10)(11). Citrate buffer (trisodium citrate; 0.1 M + citric acid; 0.1 M) and Borax (0.025 M + NaOH; 0.1 M) were employed to keep the pH constant.…”

Section: Photodegradation Of Es and Et By Using Fe 2 O 3 And Bc@fe 2 ...mentioning

confidence: 99%

Green Synthesis of a Biochar‐Based Iron Oxide Catalyst for Efficient Degradation of Pesticides: Kinetics and Photoactivity

et al. 2023

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Photocatalysis is considered as promising methodology for the removal of pesticides from wastewater given its cost‐effective and environmental benignity. Pesticide toxicity and bioaccumulation have brought up environmental issues, underlining the necessity for efficient removal techniques based on novel nanomaterials. Herein, biochar (BC) synthesized by using waste peels of citrus limetta embedded with green synthesized Fe2O3 nanoparticle by using green tea extract. By using PXRD analysis, the α phase of Fe2O3 confirmed. Endosulfan (ES) and Ethion (ET) pesticides are degraded photocatalytically using a sequential, BC@ Fe2O3 nanohybrid. At the pollutant concentration (50 mg L−1), with catalytic dose (25 mg) in acidic condition under natural sunlight, BC@ Fe2O3 showed to be extremely effective in the breakdown of pesticides. The higher removal of pesticides by BC@ Fe2O3 supported by higher value of zeta potential (−22.5 mV), enhanced surface area (74 m2 g−1) and lower value of band gap (1.8 eV) as an effect of interactive characteristic and semiconducting behaviour. The fast decline in pesticide concentration followed by a gradual decrease demonstrated Ist order kinetics triggered by Langmuir adsorption. The availability of active species such as oxygen, hydroxyl radicals and holes, which are liable for pesticide breakdown, proved by scavenger analysis. Formation of safer metabolites during the photocatalytic studies confirmed by the LC‐MS studies. Finally, modified BC@ Fe2O3 nanohybrid may prove to be a viable alternative catalyst for industrial applications due to their reusability (n=7), charge separation, stability and high surface activity.

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Section: Photodegradation Of Es and Et By Using Fe 2 O 3 And Bc@fe 2 ...mentioning

confidence: 99%

Green Synthesis of a Biochar‐Based Iron Oxide Catalyst for Efficient Degradation of Pesticides: Kinetics and Photoactivity

et al. 2023

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“… Bouwman et al, 2015 ; Bouwman et al, 2013 ; Buah-Kwofie et al, 2018a ; Vogt et al, 2018 ; Wepener et al, 2011 ; Wolmarans et al, 2018 ; Wu et al, 2019 .…”

Section: Uncited Referencesunclassified

Agrochemicals in freshwater systems and their potential as endocrine disrupting chemicals: A South African context

Horak

Horn

Pieters

2021

Environmental Pollution

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South Africa is the largest agrochemical user in sub-Saharan Africa, with over 3 000 registered pesticide products. Although they reduce crop losses, these chemicals reach non-target aquatic environments via leaching, spray drift or run-off. In this review, attention is paid to legacy and current-use pesticides reported in literature for the freshwater environment of South Africa and to the extent these are linked to endocrine disruption. Although banned, residues of many legacy organochlorine pesticides (endosulfan and dichlorodiphenyltrichloroethane (DDT)) are still detected in South African watercourses and wildlife. Several current-use pesticides (triazine herbicides, glyphosate-based herbicides, 2,4-dichlorophenoxyacetic acid (2,4-D) and chlorpyrifos) have also been reported. Agrochemicals can interfere with normal hormone function of non-target organism leading to various endocrine disrupting (ED) effects: intersex, reduced spermatogenesis, asymmetric urogenital papillae, testicular lesions and infertile eggs. Although studies investigating the occurrence of agrochemicals and/or ED effects in freshwater aquatic environments in South Africa have increased, few studies determined both the levels of agricultural pesticides present and associated ED effects. The majority of studies conducted are either laboratory-based employing in vitro or in vivo bioassays to determine ED effects of agrochemicals or studies that investigate environmental concentrations of pesticides. However, a combined approach of bioassays and chemical screening will provide a more comprehensive overview of agrochemical pollution of water systems in South Africa and the risks associated with long-term chronic exposure.

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“…Reptiles and amphibians are both insufficiently studied taxa in this regard. Reptiles, specifically crocodiles, have recently become the focus of several studies from conservation areas in South Africa that indicated high OCP concentrations in these predators (Buah-Kwofie et al, 2018a;Gerber et al, 2021). Amphibians are specifically understudied in Africa with regard to pesticides (Wolmarans et al, 2020), but OCP accumulation has been confirmed in amphibians from IRS regions in South Africa (Viljoen et al, 2016;Wolmarans et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Bioaccumulation of DDT and other organochlorine pesticides in amphibians from two conservation areas within malaria risk regions of South Africa

et al. 2021

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Accumulation of organochlorine pesticides in fat tissue of wild Nile crocodiles (Crocodylus niloticus) from iSimangaliso Wetland Park, South Africa

Cited by 33 publications

References 41 publications

Green Synthesis of a Biochar‐Based Iron Oxide Catalyst for Efficient Degradation of Pesticides: Kinetics and Photoactivity

Green Synthesis of a Biochar‐Based Iron Oxide Catalyst for Efficient Degradation of Pesticides: Kinetics and Photoactivity

Agrochemicals in freshwater systems and their potential as endocrine disrupting chemicals: A South African context

Bioaccumulation of DDT and other organochlorine pesticides in amphibians from two conservation areas within malaria risk regions of South Africa

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