Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, China.
Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA.
Int J Environ Res Public Health. 2018 May 28;15(6):1088. doi: 10.3390/ijerph15061088.
In this study, a self-propelled high-energy ultrasonic atomizer was evaluated in terms of deposition on the canopy, the loss to the ground, and fungicide residues in cherry tomato and tomato. Artificial collectors fixed to the upper side and underside of the leaves at different depths and heights were used to collect the depositions. A reliable analytical method for determination of azoxystrobin and tebuconazole in artificial collectors and residue samples was developed by using liquid chromatography triple-quadrupole mass spectrometry. The results showed that the atomizer distributed the droplets evenly throughout the greenhouse with good uniformity (CVs below 39%). The ratio of depositions on the internal and external sides was 66⁻83%, and the ratio of depositions on the underside and upper side was 39⁻50%. There were no significant differences in depositions between two different height crops. The residues of azoxystrobin and tebuconazole in tomato and cherry tomato fruits were far below the maximum residue limits at harvest time. In general, self-propelled high-energy ultrasonic atomizer used in a greenhouse could increase the depositions, especially on the underside and internal side of the canopies, and lead to a reduction of operator exposure risk.
在这项研究中，对自行式高能超声喷雾器的叶冠沉积、地面损失和樱桃番茄及番茄中的杀菌剂残留进行了评估。采用固定在叶片上、不同深度和高度的上侧和下侧人工收集器来收集沉积量。通过使用液相色谱三重四极杆质谱法，建立了一种用于人工收集器和残留样品中测定唑菌酯和戊唑醇的可靠分析方法。结果表明，该喷雾器在整个温室中均匀分布雾滴，均匀性好（CV 值低于 39%）。内、外叶冠沉积比例为 66-83%，下、上叶冠沉积比例为 39-50%。不同高度作物的沉积量无显著差异。收获时，番茄和樱桃番茄果实中唑菌酯和戊唑醇的残留量远低于最大残留限量。总的来说，温室中使用的自行式高能超声喷雾器可以增加沉积量，特别是在叶冠的下侧和内侧，降低操作人员的暴露风险。
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