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Dissipation, terminal residues and risk assessment of fluopicolide and its metabolite in cucumber under field conditions

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Abstract

In this study, the dissipation, terminal residue levels, and risk assessment of fluopicolide and its metabolite (2,6-dichlorobenzamide) in cucumber and soil under field conditions were investigated. An analytical method for the simultaneous quantification of fluopicolide and its metabolite in cucumber and soil using gas chromatography coupled with electron capture detection (GC-ECD) was developed. Recoveries were between 78 and 111 %, with relative standard deviations (RSDs) from 1.6 to 10.2 % at different spiked levels (0.01, 0.025, 0.5, and 2 mg kg−1). The limit of quantification (LOQ) was 0.01 mg kg−1. Fluopicolide exhibited half-lives ranging from 2.0 to 3.3 days and 35 to 63 days, in cucumber and soil under field ecosystem, respectively. The results suggested that the degradation of fluopicolide to 2,6-dichlorobenzamide was quite limited. During harvest, the terminal residues of fluopicolide and its metabolite were both below 0.13 mg kg−1, which were lower than the established temporary maximum residue limits (MRLs), 0.5 mg kg−1. The risk quotients (RQs) ranged from 0.0033 to 0.0078, which showed low risk for different groups of people in China. The present study may provide guidance on reasonable use of this pesticide and serve as a reference for establishment official MRLs in China.

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Authors and Affiliations

  1. College of Science, China Agricultural University, Beijing, 100193, China

    Kaiwei Shi & Fengmao Liu

  2. State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China

    Kaiwei Shi, Wei Li, Longfei Yuan & Li Li

Authors
  1. Kaiwei Shi
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  2. Wei Li
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  3. Longfei Yuan
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  4. Li Li
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  5. Fengmao Liu
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Corresponding authors

Correspondence to Li Li or Fengmao Liu.

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Highlights

1. Dissipation of fluopicolide and its metabolite in cucumber were firstly investigated.

2. Terminal residue levels were obtained with recommended dose and PHI.

3. Risk assessment for different groups of people in China was done.

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Shi, K., Li, W., Yuan, L. et al. Dissipation, terminal residues and risk assessment of fluopicolide and its metabolite in cucumber under field conditions. Environ Monit Assess 187, 698 (2015). https://doi.org/10.1007/s10661-015-4924-5

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  • DOI: https://doi.org/10.1007/s10661-015-4924-5

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