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CHANG ET AL.: JOURNAL OF AOAC INTERNATIONAL V OL. 99, NO . 4, 2016 1057
Conclusions
In summary, the degradation regularity of 271 pesticides in
aged Oolong tea over 120 days was studied by the developed
GC-MS/MS method. The results indicate that >70 of the 271
pesticides decreased exponentially or logarithmically in aged
Oolong tea, con¿rming that the pesticides in aged Oolong tea
degrade slowly and the concentrations of pesticides decrease
with the increase of time intervals over 4 months. Further
discussion of the different classes of pesticides suggests
that most of the organophosphorus pesticides degraded in
accordance with degradation trends A and B in aged Oolong
tea and that most of the organochlorine pesticides decreased
according to degradation trend E in aged Oolong tea.
The pesticide residues in aged Oolong tea were predicted
accurately by subtracting the degradation value of target
pesticides on a speci¿c day from the logarithmical curves,
generated by plotting determination time (day) and the difference
between each measured value and ¿rst-time-measured value of
target pesticides on the x- and y-axes, respectively. The predicted
results of 14 pesticides were satisfactory by comparing them with
measured results at one of the concentrations of the Youden pair.
It is our hope that the obtained degradation regularity of 271
pesticides in aged Oolong tea will be helpful for studying the
stability of standard material of multipesticide residues in tea. In
addition, we propose that the prediction procedure of pesticides
in aged Oolong tea in the present study may offer a new method
for the error analysis of multiresidue of pesticides in other
complex matrixes of international, interlaboratory study.
Acknowledgments
This work was ¿nancially supported by the General
Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China (AQSIQ) special
public welfare project of China (Project No. 201010080).
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