This study was carried out to investigate residual characteristics of etofenprox and flubendiamide in whole grain, husked rice and polished rice. Field trials were conducted from three fields located in major areas of rice production in the Republic of Korea. Etofenprox 10% EC and flubendiamide 4% SC were sprayed three times onto the rice with a 10-day interval at 160 and 32 g a.i./ha, respectively, according to its critical GAP in the Republic of Korea. Threshing was done on the prearranged days of harvest and dried under greenhouse. The whole grain was processed to produce husked rice and polished rice by using rice milling machine. Residues of test pesticides in whole grain, husked rice and polished rice were analyzed by a verified analytical method using LC-MS/MS. The limits of quantitation of the test pesticides in whole grain, husked rice and polished rice were all 0.01 mg/kg. Recoveries of etofenprox and flubendiamide in three samples ranged from 74.37-113.70 and 81.75-117.79%, respectively. Amounts of residue in whole grain, husked rice and polished rice were 2.31-4.10, 0.09-0.16 and 0.01 mg/kg for etofenprox and 0.61-1.34, 0.01-0.06 and &lt;0.01 mg/kg for flubendiamide. Amounts of pesticide residue appeared to decrease in the order of whole grain, husked rice and polished rice. These results represented that the amount of residue decreased significantly by milling the whole grain.

Residual characteristics of etofenprox and flubendiamide in rice (<i>Oryza sativa L</i>.)

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Residual characteristics of etofenprox and flubendiamide in rice (Oryza sativa L.)