Residue Patterns of Indoxacarb and Thiamethoxam in Chinese Cabbage (Brassica campestris L.) Grown under Greenhouse Conditions and Their Estimated Daily Intake
2008
Lee, E.Y. (Chungbuk National University, Cheongju, Republic of Korea) | Kim, D.K. (Chungbuk National University, Cheongju, Republic of Korea) | Park, I.Y. (Chungbuk National University, Cheongju, Republic of Korea) | Noh, H.H. (Chungbuk National University, Cheongju, Republic of Korea) | Park, Y.S. (Chungbuk National University, Cheongju, Republic of Korea) | Kim, T.H. (Kyungpook National University, Daegu, Republic of Korea) | Jin, C.W. (Chungbuk Provincial Office, National Agricultural Products Quality Management Service, Cheongju, Republic of Korea) | Kim, K.I. (Chungbuk Provincial Office, National Agricultural Products Quality Management Service, Cheongju, Republic of Korea) | Yun, S.S. (Chungbuk Provincial Office, National Agricultural Products Quality Management Service, Cheongju, Republic of Korea) | Oh, S.K. (Chungbuk Provincial Office, National Agricultural Products Quality Management Service, Cheongju, Republic of Korea) | Kyung, K.S. (Chungbuk National University, Cheongju, Republic of Korea), E-mail: [email protected]
This experiment was carried out to investigate the residue patterns of two insecticides, indoxcarb and thiamethoxam, commonly used for Chinese cabbage, under greenhouse conditions. The pesticides were sprayed onto Chinese cabbage at the recommended dose and double of the recommended dose 10 days before the prearranged harvest and then sampling was done at 0.17, 1, 2, 3, 4, 5, 6, 8, 10, and 12 days after spraying. The amounts of their residues in the crop were analyzed with an HPLC. The limit of detection (LOD) of both indoxacarb and thiamethoxam was 0.01 mg kg-¹ and mean recoveries of indoxacarb and thiamethoxam were from 97.91 to 104.36% and from 97.07 to 105.49%, respectively. Half-lives of indoxacarb and thiamethoxam were 3.4 and 2.3 days at the recommended dose and 3.3 and 3.5 days at the doubled dose, respectively. The ratios of the EDI to ADI by intake the crop harvested 10 days after spraying were less than 4% of their ADIs.
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