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Pesticides often feature structurally complex chemical architectures, incorporating halogen groups and multiple aromatic rings. These characteristics confer high chemical stability, rendering many pesticides resistant to natural degradation processes. This resistance poses significant environmental concerns, as persistent pesticide residues can accumulate in ecosystems and affect non-target organisms.Despite the inherent stability of many pesticides, certain microorganisms possess the metabolic...
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Decrease of pirimiphos-methyl and deltamethrin residues in stored rice with post-harvest treatment.

Chuanshan Yu1, Yanjie Li2, Qian Zhang3

  • 1Department of Applied Chemistry, College of Science, China Agricultural University, 2 Yuanmingyuanxilu, Haidian District, Beijing 100193, China. chuanshan.yu@gmail.com.

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Pesticide residues in stored rice were analyzed using a modified QuEChERS method. Pirimiphos-methyl and deltamethrin showed slow dissipation, with residues below safety limits, indicating safe use at recommended dosages.

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Area of Science:

  • Agricultural Chemistry
  • Environmental Science
  • Food Safety

Background:

  • Pesticide application in stored grains is crucial for preventing losses.
  • Understanding pesticide dissipation and residue levels is vital for food safety and regulatory compliance.
  • The development of efficient analytical methods is necessary for accurate residue determination.

Purpose of the Study:

  • To analyze pirimiphos-methyl and deltamethrin residues in stored rice.
  • To investigate the dissipation kinetics of these pesticides under simulated storage conditions.
  • To evaluate the safety of these pesticides based on established Maximum Residue Limits (MRLs).

Main Methods:

  • A modified Quick, Easy, Cheap, Effective, Rugged, (QuEChERS) method utilizing multi-walled carbon nanotubes (MWCNTs) for reversed-dispersive solid-phase extraction (r-DSPE).
  • Simulated storehouse trials were conducted using dustable powder (DP) formulations of pirimiphos-methyl and deltamethrin.
  • Residue analysis and dissipation studies were performed on stored rice samples over time.

Main Results:

  • Slow dissipation rates were observed for both pirimiphos-methyl (half-lives: 23.9-28.9 days) and deltamethrin (half-lives: 23.9-24.8 days).
  • Pirimiphos-methyl residues ranged from 1.6-4.5 mg/kg and deltamethrin residues from 0.13-0.14 mg/kg at 60 days Pre-Harvest Interval (PHI).
  • All detected pesticide residues were below the Maximum Residue Limits (MRLs) set by the Codex Alimentarius Commission (CAC).

Conclusions:

  • The modified QuEChERS method with MWCNTs is effective for analyzing pirimiphos-methyl and deltamethrin residues in stored rice.
  • Pirimiphos-methyl and deltamethrin exhibit slow dissipation in stored rice, with residues remaining within safe limits.
  • The recommended dosages of pirimiphos-methyl and deltamethrin are safe for use on stored rice, ensuring food safety.