Degradation products and pathway of ethiprole in water and soil

Chen, Kaiying; Tian, Fajun; Wu, Chi; Wu, Xiaohu; Xu, Jun; Dong, Fengshou; Liu, Xingang; Zheng, Yongquan

doi:10.1016/j.watres.2019.06.004

Cited by 46 publications

(20 citation statements)

References 22 publications

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“…Vegetable plants are frequently chosen for studies on the uptake, translocation, distribution, and metabolic behaviors of pollutants because they are a representative of contamination-susceptible plants and important fresh agricultural produce consumed with minimal processing. − However, studying the unknown metabolites involved in the biotransformation of pesticides is facing great challenge due to the complex matrix effects existing in plants, especially in the absence of reference standards. The high-resolution mass spectrometry (HRMS) technique, characterized by high resolution and high mass accuracy, is increasingly utilized for metabolite screening and identification. ,− In this study, we conducted a comprehensive exploration of the environmental fate, including uptake, translocation, and biotransformation, of imidaclothiz in plant–water systems. The classical analytical tool of ultraperformance liquid chromatography/tandem mass spectrometry (UPLC–TQD-MS/MS) and the advanced analytical tool of ultrahigh-performance liquid chromatography–quadrupole time-of-flight mass spectrometry (UPLC–Q TOF-MS) were used for quantitative and qualitative analyses, respectively.…”

Section: Introductionmentioning

confidence: 99%

Uptake, Translocation, and Biotransformation of Neonicotinoid Imidaclothiz in Hydroponic Vegetables: Implications for Potential Intake Risks

Yan

Jia

Jing

et al. 2021

J. Agric. Food Chem.

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Imidaclothiz is a novel and systemic neonicotinoid pesticide with excellent insecticidal efficacy. However, knowledge of its uptake, translocation, and biotransformation within plants is still largely unknown, restricting work on its accurate and comprehensive risk assessment. Here, we systematically investigated the behavior of imidaclothiz in three plant−water systems via hydroponic experiments. The results showed that imidaclothiz was readily taken up by plant roots and translocated upward, resulting in relative enrichment in leaves. The recoveries of imidaclothiz in plant−water systems decreased with increasing exposure time, and approximately 31.8−45.6% mass loss was measured at the end of exposure. Ultimately, imidaclothiz yielded five products in celery leaves, three products in lettuce leaves, and two products in radish leaves. Multiple metabolic reactions including hydroxylation, hydrolysis of nitrate ester, and methylation occurred within plants. This is the first report on the fate of imidaclothiz within plants and suggests increasing concerns about the risk assessment of imidaclothiz.

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Section: Introductionmentioning

confidence: 99%

Uptake, Translocation, and Biotransformation of Neonicotinoid Imidaclothiz in Hydroponic Vegetables: Implications for Potential Intake Risks

Yan

Jia

Jing

et al. 2021

J. Agric. Food Chem.

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“…13,27 The rate of degradation of pesticide residue is affected by environmental conditions, application rate, nature of the pesticide, formulation, and plant species. 24,28,29 The leaf characteristics of Chinese kale may affect how the thiamethoxam would be retained on the surface of the leaves and penetrated into the plant tissues, and different crops had different capacities for metabolizing thiamethoxam. 18 The concentrations of thiamethoxamʼs metabolite clothianidin were < 0.01 mg kg −1 detected 1 day after thiamethoxam application at Hunan and Shandong field conditions.…”

Section: Dissipation Kinetics Of Thiamethoxam In Chinese Kalementioning

confidence: 99%

Monitoring residue levels and dietary risk assessment of thiamethoxam and its metabolite clothianidin for Chinese consumption of Chinese kale

Chen

Zhang

et al. 2021

J Sci Food Agric

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BACKGROUND: Thiamethoxam is widely used to control pests in Chinese kale, popularly consumed leafy vegetables. The potential risk to the environment and human health has aroused much public concern. Therefore, it is important to investigate the degradation behavior, residue distribution and dietary risk assessment of thiamethoxam in Chinese kale.RESULTS: A sensitive analytical method for determination of thiamethoxam and its metabolite clothianidin residue in Chinese kale was established and validated through a quick, easy, cheap, effective, rugged, and safe (QuEChERS) technique with ultraperformance liquid chromatography tandem mass spectrometry (UPLC-MS/MS). The recoveries were 85.4-101.2% for thiamethoxam and 79.5-108.1% for clothianidin, with the relative standard deviations (RSDs) of 0.9-10.2% and 1.8-6.0%, respectively. For the dissipation kinetics, the data showed that thiamethoxam in Chinese kale was degraded with the half-lives of 4.1 to 4.5 days. In the terminal residue experiments, the residues of thiamethoxam were 0.017-0.357 mg kg −1 after application 2-3 times with a preharvest interval (PHI) of 7 days under the designed dosages. The chronic and acute dietary exposure assessment risk quotient (RQ) values of thiamethoxam in Chinese kale for different Chinese consumers were 0.08-0.19% and 0.05-0.12%, respectively, and those of clothianidin were 0.01-0.04% and 0.02-0.04%, respectively, all of the RQ values were lower than 100%.CONCLUSION: Thiamethoxam in Chinese kale was rapidly degraded following first-order kinetics models. The dietary risk of thiamethoxam and clothianidin through Chinese kale was negligible to consumers. The results from this study are important reference for Chinese governments to developing criteria for the safe and rational use of thiamethoxam, setting maximum residue levels (MRLs), monitoring the quality safety of agricultural products and protecting consumer health.

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“…Increasing the concentration of external carbon source, and co-existence of other contaminants impacted sulfolane degradation. Chen, Tian, et al (2019) investigated the degradation products of ethiprole under different pH, light, and oxygen availability. The authors identified more than 10 degradation products one of which, M401, was more toxic than its parent compound.…”

Section: Biological Treatmentmentioning

confidence: 99%