Chlorpyrifos Degradation in Soils with Different Treatment Regimes Within Nzoia River Drainage Basin, Kenya

Mutua, Gershom Kyalo; Ngigi, Anastasiah N.; Getenga, Zachary

doi:10.1007/s00128-015-1465-0

Cited by 11 publications

(8 citation statements)

References 30 publications

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“…The DA and DK are formed as a result of deamination and desulfuration of MB, respectively (Henriksen et al, 2002;Khoury et al, 2006). Further removal of the -NH 2 group (deamination) from DK or removal of the -SCH 3 group (desulfuration) of DA results in the formation of DADK (Mutua et al, 2016). In the present study, no MB metabolites were detected in the uninoculated treatments, i.e., S-UI and S-UI_BC, which might be due to a minimal degradation of MB.…”

Section: Discussionmentioning

confidence: 99%

RETRACTED: Immobilization of metribuzin-degrading bacteria on biochar: Enhanced soil remediation and bacterial community restoration

Wahla

Anwar²,

Fareed³

et al. 2023

Front. Microbiol.

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Metribuzin (MB), a triazinone herbicide is extensively sprayed for weed control in agriculture, has been reported to contaminate soil, groundwater, and surface waters. In soil, MB residues can negatively affect not only the germination of subsequent crops but also disturb soil bacterial community. The present study describes the use of biochar as a carrier material to immobilize MB-degrading bacterial consortium, for remediation of MB-contaminated soil and restoration of soil bacterial community in soil microcosms. The bacterial consortium (MB3R) comprised four bacterial strains, i.e., Rhodococcus rhodochrous AQ1, Bacillus tequilensis AQ2, Bacillus aryabhattai AQ3, and Bacillus safensis AQ4. Significantly higher MB remediation was observed in soil augmented with bacterial consortium immobilized on biochar compared to the soil augmented with un-immobilized bacterial consortium. Immobilization of MB3R on biochar resulted in higher MB degradation rate (0.017 Kd−1) and reduced half-life (40 days) compared to 0.010 Kd−1 degradation rate and 68 day half-life in treatments where un-immobilized bacterial consortium was employed. It is worth mentioning that the MB degradation products metribuzin-desamino (DA), metribuzin-diketo (DK), and metribuzin desamino-diketo (DADK) were detected in the treatments where MB3R was inoculated either alone or in combination with biochar. MB contamination significantly altered the composition of soil bacteria. However, soil bacterial community was conserved in response to augmentation with MB3R immobilized on biochar. Immobilization of the bacterial consortium MB3R on biochar can potentially be exploited for remediation of MB-contaminated soil and protecting its microbiota.

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Section: Discussionmentioning

confidence: 99%

RETRACTED: Immobilization of metribuzin-degrading bacteria on biochar: Enhanced soil remediation and bacterial community restoration

Wahla

Anwar²,

Fareed³

et al. 2023

Front. Microbiol.

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“…The results showed no statistically significant growth difference on the three concentrations (5 ppm, 10 ppm, and 40 ppm; p = 0.99). These findings corroborate earlier studies that had reported CP degradation at different concentrations ( Mutua et al., 2015 ; Verma et al., 2020 ).…”

Section: Discussionsupporting

confidence: 93%

Molecular characterization of chlorpyrifos degrading bacteria isolated from contaminated dairy farm soils in Nakuru County, Kenya

Asamba

Njeru

Sifuna

et al. 2022

Heliyon

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“…While with CP 200 C 0.25 and CP 200 C 0.50 treatments, 33% and 69% less CP residues were recorded, respectively, compared with CP 200 . The increased degradation of CP was due to an enhanced microbial population introduced by the addition of organic material such as compost [ 42 ]. The microbes can utilize labile carbon provided by compost [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

Alleviation of Chlorpyrifos Toxicity in Maize (Zea mays L.) by Reducing Its Uptake and Oxidative Stress in Response to Soil-Applied Compost and Biochar Amendments

Aziz

Murtaza

Saleem

et al. 2021

Plants

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Chlorpyrifos (CP) is a pesticide used extensively in agricultural crops. Residual CP has been found in a variety of soils, vegetables and fruits indicating a serious danger to humans. Therefore, it is necessary to restrict its entry into agricultural products for food safety. A wire-house pot experiment was conducted with maize plants in biochar- and compost-amended soil (at 0.25% and 0.50%, respectively, in weight-by-weight composition) contaminated with 100 and 200 mg kg−1 of CP, respectively. Results indicated toxicity at both CP levels (with 84% growth reduction) at CP 200 mg kg−1. However, application of compost and biochar at the 0.50% level improved the fresh weight (2.8- and 4-fold, respectively). Stimulated superoxide dismutase (SOD) and peroxidase (POX) activities and depressed catalase (CAT) activity were recorded in response to CP contamination and were significantly recovered by the amendments. Both amendments significantly decreased the CP phytoavailability. With biochar, 91% and 76% reduction in the CP concentration in maize shoots and with compost 72% and 68% reduction was recorded, at a 0.50% level in 100 and 200 mg kg−1 contaminated treatments respectively. Compost accelerated the CP degradation in postharvest soil. Therefore, biochar and compost amendments can effectively be used to decrease CP entry in agricultural produce by reducing its phytoavailability.

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Chlorpyrifos Degradation in Soils with Different Treatment Regimes Within Nzoia River Drainage Basin, Kenya

Cited by 11 publications

References 30 publications

RETRACTED: Immobilization of metribuzin-degrading bacteria on biochar: Enhanced soil remediation and bacterial community restoration

RETRACTED: Immobilization of metribuzin-degrading bacteria on biochar: Enhanced soil remediation and bacterial community restoration

Molecular characterization of chlorpyrifos degrading bacteria isolated from contaminated dairy farm soils in Nakuru County, Kenya

Alleviation of Chlorpyrifos Toxicity in Maize (Zea mays L.) by Reducing Its Uptake and Oxidative Stress in Response to Soil-Applied Compost and Biochar Amendments

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