Int. J. Environ. Res. Public Health 2014, 11(5), 5372-5381; doi:10.3390/ijerph110505372
Article

Decrease of Pirimiphos-Methyl and Deltamethrin Residues in Stored Rice with Post-Harvest Treatment

1email, 1email, 1email, 1email, 1email, 2email and 1,2,* email
Received: 17 March 2014; in revised form: 6 May 2014 / Accepted: 9 May 2014 / Published: 16 May 2014
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: A modified quick, easy, cheap, effective, rugged (QuEChERS) method with multi-walled carbon nanotubes (MWCNTs) as reversed-dispersive solid phase extraction (r-DSPE) material was applied to the analysis of pirimiphos-methyl and deltamethrin residues in stored rice. Two dustable powder (DP) formulations (2% pirimiphos-methyl and deltamethrin DP; 5% pirimiphos-methyl DP) were applied in simulated storehouse trials in the lab. The residues and dissipation of the two pesticides in stored rice were investigated. Slow dissipation of both pesticides was observed in stored rice. The half-lives of pirimiphos-methyl were 23.9–28.9 days, and those of deltamethrin were 23.9–24.8 days. Residues of pirimiphos-methyl from application rates of 4.5–6.75 a.i. mg/kg (active ingredient milligram per kilogram) and 10–15 a.i. mg/kg were 1.6–3.8 mg/kg and 3.0–4.5 mg/kg at 60 days Pre-harvest Interval (PHI). Residues of deltamethrin from an application rate of 0.5–0.75 a.i. mg/kg were 0.13–0.14 mg/kg at 60 days PHI. Both pesticides residues were below the Maximum Residue Limits (MRLs) established by the Codex Alimentarius Commission (CAC). Therefore, at the recommended dosages they are safe for use on stored rice.
Keywords: pirimiphos-methyl; deltamethrin; rice; post-harvest treatment; residue; dissipation
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MDPI and ACS Style

Yu, C.; Li, Y.; Zhang, Q.; Zou, N.; Gu, K.; Li, X.; Pan, C. Decrease of Pirimiphos-Methyl and Deltamethrin Residues in Stored Rice with Post-Harvest Treatment. Int. J. Environ. Res. Public Health 2014, 11, 5372-5381.

AMA Style

Yu C, Li Y, Zhang Q, Zou N, Gu K, Li X, Pan C. Decrease of Pirimiphos-Methyl and Deltamethrin Residues in Stored Rice with Post-Harvest Treatment. International Journal of Environmental Research and Public Health. 2014; 11(5):5372-5381.

Chicago/Turabian Style

Yu, Chuanshan; Li, Yanjie; Zhang, Qian; Zou, Nan; Gu, Kejia; Li, Xuesheng; Pan, Canping. 2014. "Decrease of Pirimiphos-Methyl and Deltamethrin Residues in Stored Rice with Post-Harvest Treatment." Int. J. Environ. Res. Public Health 11, no. 5: 5372-5381.

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