Photo-induced degradation of emamectin benzoate: effect of iron amendments and solvent system

Tariq, Saadia R.; Rafique, Nazia; Kiran, Sana; Khan, Ali Haider

doi:10.1007/s12665-013-3015-6

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…When the soil-incorporated chlorpyrifos was spiked with Fe 2+ , an increase in the rate of photodegradation of chlorpyrifos was observed from 3.5×10 −2 to 5.5×10 −2 (p<0.05) and its t 0.5 was decreased from 19.74 to 12.6 days ( Table 2). The role of Fe 2+ in catalyzing the photodegradation of pesticides has also been reported by other authors (Guzsvany et al 2010;Kochany 1992;Tariq et al 2014;Zheng and Ye 2001).…”

Section: Effects Of Fe 2+ On Chlorpyrifos Degradationsupporting

confidence: 70%

Cu2+ and Fe2+ mediated photodegradation studies of soil-incorporated chlorpyrifos

Rafique

Tariq

Ahad

et al. 2015

Environ Sci Pollut Res

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The influences of Cu(2+) and Fe(2+) on the photodegradation of soil-incorporated chlorpyrifos were investigated in the present study. The soil samples spiked with chlorpyrifos and selected metal ions were irradiated with UV light for different intervals of time and analyzed by HPLC. The unsterile and sterile control soil samples amended with pesticides and selected metals were incubated in the dark at 25 °C for the same time intervals. The results of the study evidenced that photodegradation of chlorpyrifos followed the first-order kinetics. The dissipation t0.5 of chlorpyrifos was found to decrease from 41 to 20 days under UV irradiation. The rate of chlorpyrifos photodegradation was increased in the presence of both metals, i.e., Cu(2+) and Fe(2+). Thus, initially observed t0.5 of 19.8 days was decreased to 4.39 days in the case of Cu(+2) and 19.25 days for Fe(+2). Copper was found to increase the rate of photodegradation by 4.5 orders of magnitude while the microbial degradation of chlorpyrifos was increased only twofold. The microbial degradation of chlorpyrifos was only negligibly affected by Fe(2+) amendment. The studied trace metals also affected the abiotic degradation of the pesticide in the order Cu(2+) > Fe(2+).

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Section: Effects Of Fe 2+ On Chlorpyrifos Degradationsupporting

confidence: 70%

Cu2+ and Fe2+ mediated photodegradation studies of soil-incorporated chlorpyrifos

Rafique

Tariq

Ahad

et al. 2015

Environ Sci Pollut Res

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“…Iron is known to accelerate the photolysis of pesticides through the photosensitizing effect. [64][65][66][67][68] Raque et al (2014) evidenced that a 3-fold increase in percent degradation of imidacloprid was observed in moist soils by the catalytic addition of iron to soil. 52 The present study also evidenced an accelerated photodegradation of a-cypermethrin under the UV chamber by the addition of iron.…”

Section: Effect Of Trace Metals On Photodegradationmentioning

confidence: 99%

Photodegradation of α-cypermethrin in soil in the presence of trace metals (Cu²⁺, Cd²⁺, Fe²⁺and Zn²⁺)

Rafique

Tariq

2015

Environ. Sci.: Processes Impacts

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The influence of trace metals (Cu(2+), Zn(2+), Cd(2+) and Fe(2+)) on the photodegradation of α-cypermethrin (α-CYM) in agricultural soil was studied. The soil samples were spiked with α-cypermethrin with/without the presence of metal ions, irradiated under a UV irradiation chamber for a regular period of time and analyzed by using HPLC. The dark control sterile and unsterile soil samples spiked with α-cypermethrin and selected trace metals were incubated for the same interval of time at 25 °C. The results obtained indicated that α-cypermethrin photodegradation followed biphasic kinetics. α-cypermethrin photodegradation half-lives (t1/2) were increased to 0.71 and. 4.5 hours from 0.64 hours respectively in the presence of elevated Zn(2+) and Cu(2+) concentrations. Fe(2+) and Cd(2+) increased the photodegradation reaction kinetics from -1.078 h(-1) to -1.175 h(-1) and -1.397 h(-1) and varied the t1/2 from 0.64 ± 1.41 to 0.59 ± 2.07 and 0.49 ± 2.01 in the soil. Microbes also affected the degradation of α-cypermethrin in metal contaminated soil. The degradation rate was inhibited in unsterile soil and was found to be in the following order: Cd(2+)< Zn(2+)< Cu(2+)< Fe(2+). The degradation/persistence of α-cypermethrin was affected linearly with the increasing soil metal concentrations.

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“…Reduction of EMB concentrations was also observed in another D. magna study in which the measured EMB concentrations were 70% lower than nominal after 48 h exposure . The instability of EMB in the exposure system has been proposed to be due to its rapid photodegradation in aqueous solution …”

Section: Resultsmentioning

confidence: 60%

“…23 The instability of EMB in the exposure system has been proposed to be due to its rapid photodegradation in aqueous solution. 24 Adverse Effects and Ecdysone Receptor Activity. After 48 h exposure, increase in mortality of D. magna were observed at concentrations as low as 31.2 pM and with 100% mortality occurring at 2000 pM EMB (Figure 1).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Whole-Organism Transcriptomic Analysis Provides Mechanistic Insight into the Acute Toxicity of Emamectin Benzoate in Daphnia magna

Shang

Rundberget

Evenseth

et al. 2016

Environ. Sci. Technol.

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Emamectin benzoate (EMB) is an antisea lice chemical widely used in the aquaculture that may also unintentionally affect nontarget crustaceans in the environment. Although the adverse effects of this compound are well documented in various species, the full modes of action (MoAs) are still not well characterized. The current study was therefore conducted to characterize the MoAs of EMB and link perturbations of key toxicological pathways to adverse effects in the model freshwater crustacean Daphnia magna. Effects on molting and survival were determined after 48 h exposure to EMB, whereas global transcriptional changes and the ecdysone receptor (EcR) binding potency was determined to characterize the MoA. The results showed that the molting frequency and survival of D. magna decreased in a concentration-dependent manner, and the observed changes could not be attributed to direct interactions with the EcR. Major MoAs such as activation of glutamate-gated chloride channels and gamma-aminobutyric acid signaling, disruption of neuroendocrine regulation of molting, perturbation of energy homeostasis, suppression of DNA repair and induction of programmed cell death were observed by transcriptional analysis and successfully linked to the adverse effects. This study has demonstrated that acute exposure to intermediate and high pM levels of EMB may pose hazards to nontarget crustaceans in the aquatic environment.

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Photo-induced degradation of emamectin benzoate: effect of iron amendments and solvent system

Cited by 14 publications

References 13 publications

Cu2+ and Fe2+ mediated photodegradation studies of soil-incorporated chlorpyrifos

Cu2+ and Fe2+ mediated photodegradation studies of soil-incorporated chlorpyrifos

Photodegradation of α-cypermethrin in soil in the presence of trace metals (Cu²⁺, Cd²⁺, Fe²⁺and Zn²⁺)

Whole-Organism Transcriptomic Analysis Provides Mechanistic Insight into the Acute Toxicity of Emamectin Benzoate in Daphnia magna

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Photo-induced degradation of emamectin benzoate: effect of iron amendments and solvent system

Cited by 14 publications

References 13 publications

Cu2+ and Fe2+ mediated photodegradation studies of soil-incorporated chlorpyrifos

Cu2+ and Fe2+ mediated photodegradation studies of soil-incorporated chlorpyrifos

Photodegradation of α-cypermethrin in soil in the presence of trace metals (Cu2+, Cd2+, Fe2+and Zn2+)

Whole-Organism Transcriptomic Analysis Provides Mechanistic Insight into the Acute Toxicity of Emamectin Benzoate in Daphnia magna

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Photodegradation of α-cypermethrin in soil in the presence of trace metals (Cu²⁺, Cd²⁺, Fe²⁺and Zn²⁺)