Pesticide Residues and Environmental Pollution Department, Central Agricultural Pesticide Laboratory, Agricultural Research Center, Dokki, Giza, 12618, Egypt.
Department of Analytical Chemistry, Institute of Chemistry for Energy and the Environment, University of Córdoba, Cordoba, 14071, Spain.
Biomed Chromatogr. 2024 Nov;38(11):e5992. doi: 10.1002/bmc.5992. Epub 2024 Aug 27.
Corn is the second most widely farmed grain for human consumption. Low corn productivity due to damage caused by pests has led to using pesticides to control pest infestations. However, the uncontrolled application of pesticides on corn harms both environmental and human health. Accordingly, field experiments followed good agricultural practices to investigate the dissipation pattern and terminal residues of chlorfenapyr and methomyl in corn and compare the values with established safety limits. Gas chromatography-tandem mass spectrometer coupled with the quick, easy, cheap, effective, rugged, and safe technique was used to analyze residues of chlorfenapyr and methomyl in corn. The average recoveries varied from 94% to 105%, with relative standard deviations (RSDs) of 8%-13% for chlorfenapyr and from 99% to 111%, with RSDs of 10-16% for methomyl. Chlorfenapyr and methomyl residues degraded in corn following a first-order kinetic model, with an estimated half-life (t) of 3.9 and 2.8 days, respectively, and significant degradation (91.4%-98.1.5%, respectively) after 14 days. Although the maximum residue limits of chlorfenapyr and methomyl for corn are yet to be formulated in Egypt, the long-term dietary risk for those pesticides was acceptable, with arisk quotient < 100%, according to the national assessments. These findings are required to guide the correct and safe application of these insecticides in Egypt.
玉米是人类消费的第二大种植谷物。由于虫害造成的玉米产量低，导致人们使用农药来控制虫害。然而，对玉米的农药无控制使用会危害环境和人类健康。因此，田间试验遵循良好农业规范，调查了氯氟吡氧乙酸和灭多威在玉米中的消解动态和最终残留，并将其与既定的安全限量进行了比较。采用气相色谱-串联质谱法，结合快速、简便、廉价、有效、耐用、安全的技术，分析了玉米中氯氟吡氧乙酸和灭多威的残留量。氯氟吡氧乙酸的平均回收率为 94%-105%，相对标准偏差（RSD）为 8%-13%；灭多威的平均回收率为 99%-111%，RSD 为 10%-16%。氯氟吡氧乙酸和灭多威在玉米中的残留量遵循一级动力学模型降解，半衰期（t）分别为 3.9 和 2.8 天，14 天后分别有 91.4%-98.1.5%的显著降解。尽管埃及尚未制定玉米中氯氟吡氧乙酸和灭多威的最大残留限量，但根据国家评估，这些农药的长期膳食风险是可以接受的，风险商数<100%。这些发现需要指导这些杀虫剂在埃及的正确和安全应用。
