Findings on Pesticides Described by Researchers at China Agricultural University (Decrease of pirimiphos-methyl and deltamethrin residues in stored rice with post-harvest treatment)
By a News Reporter-Staff News Editor at Health & Medicine Week -- Investigators discuss new findings in Pesticides. According to news reporting originating in Beijing, People's Republic of China, by NewsRx journalists, research stated, "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 news reporters obtained a quote from the research from China Agricultural University, "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)."
According to the news reporters, the research concluded: "Therefore, at the recommended dosages they are safe for use on stored rice."
For more information on this research see: 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):5372-81 (see also Pesticides).
Our news correspondents report that additional information may be obtained by contacting C. Yu, Dept. of Applied Chemistry, College of Science, China Agricultural University, 2 Yuanmingyuanxilu, Haidian District, Beijing 100193, People's Republic of China. Additional authors for this research include Y. Li, Q. Zhang, N. Zou, K. Gu, X. Li and C. Pan.
Keywords for this news article include: Asia, Beijing, Pesticides, Agrochemicals, People's Republic of China.
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