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Effect of Home Processing on Triazophos Residues in Pomelo Tea

LIU Yanyu1, GONG Lei1, ZHANG Yaohai1, SU Xuesu2, JIAO Bining1,3,4,*   

  1. 1. Citrus Research Institute, Laboratory of Quality and Safty Risk Assessment for Citrus Products, Quality Supervision and Testing
    Centre for Citrus and Seedling, Ministry of Agriculture, Southwest University, Chongqing 400712, China; 2. College of Chemistry
    and Chemical Engineering, Southwest University, Chongqing 400715, China; 3. National Citrus Engineering Research Center,
    Chongqing 400712, China; 4. Chongqing Municipal Key Laboratory for Citrus, Chongqing 400712, China
  • Online:2015-12-25 Published:2015-12-24
  • Contact: JIAO Bining

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Abstract:

The effect of home processing of pomelo tea on triazopho residues was investigated. The pesticide residues were
strengthened by spraying triazophos at fivefold higher dosage in the field trials and detected using Quick, Easy, Cheap,
Effective, Rugged, Safe (QuEChERS) pretreatment combined with gas chromatography (GC). The results showed that the
triazophos residues were mainly distributed in pomelo peel, in which its concentration was 7.3 times higher than that of
the whole fruit while its residues in flesh accounted for less than 3% of the total residues in the whole fruit. The washing
step decreased the concentration of triazophos in peel by 28.5%. Debittering and sugar-dipping gave significantly reduced
triazophos residues with processing factors (PFs) of 0.83 and 0.60, respectively. The whole process can reduce the residue of
triazophos to 0.18 mg/kg in pomelo tea with a PF value of 0.069.

Key words: triazophos, pomelo tea, processing factor

CLC Number: