Dislodgeable Foliar Residue Measurements and Assessment of Dermal Exposure to Captan for Workers in Apple Orchards,Environmental Science & Technology

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Dislodgeable Foliar Residue Measurements and Assessment of Dermal Exposure to Captan for Workers in Apple Orchards
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-07-22 , DOI: 10.1021/acs.est.3c10542
Geoffroy Duporté ₁ , Emmanuelle Barron ₁ , Mathilde Bureau ₂ , Karyn Le Menach ₁ , Isabelle Baldi _{2,

3} , Marie-Hélène Dévier ₁ , Hélène Budzinski ₁

Affiliation

Captan dislodgeable foliar residues (DFRs) were determined by following the applications of this fungicide in an apple orchard. The study comprised an investigation of the variability of captan DFR values and 14 days of DFR monitoring to assess kinetic modeling. A method combining solid-phase microextraction (SPME) gas chromatography and high-resolution mass spectrometry (GC-QTOF-MS) was developed for the quantification of captan residues from DFR aqueous extracts. The results evidenced that (1) sampling parameters such as the position of the tree in a row and the height of foliar significantly influenced captan DFR levels (247–1450 ng·cm^–2), highlighting the need to implement a comprehensive sampling strategy; (2) the DFR captan dissipation kinetic model best matched with a biphasic one, with half-lives of DFR_captan of 3.4 and 12.8 days, respectively, for the initial rapid phase 1 decline (day 0–5) and the slower phase 2 decline phase (day 6–14). Furthermore, through DFR measurements, the potential dermal exposure (PDE) of workers was assessed using transfer coefficients (TCs) from the literature. Compared to the acceptable operator exposure levels (AOELs), the results showed that the re-entry interval for captan may not sufficiently protect workers whose arms, hands, and legs are not covered.

中文翻译：

苹果园工人可移动叶面残留物测量和皮肤接触克菌丹的评估

克菌丹可去除叶面残留量 (DFR) 通过跟踪该杀菌剂在苹果园中的应用来测定。该研究包括对克菌丹 DFR 值变异性的调查以及用于评估动力学模型的 14 天 DFR 监测。开发了一种结合固相微萃取 (SPME) 气相色谱和高分辨率质谱 (GC-QTOF-MS) 的方法，用于定量 DFR 水提取物中的克菌丹残留量。结果表明：（1）采样参数，如树木的排位和叶高，显着影响克菌丹DFR水平（247-1450 ng·cm ^–2 ），强调需要实施全面的采样策略； (2) DFR 克菌丹耗散动力学模型与双相模型最匹配，DFR_克菌丹的半衰期分别为 3.4 和 12.8 天，分别用于最初快速的第 1 相下降（第 0-5 天）和较慢的第 2 相下降阶段（第 6-14 天）。此外，通过 DFR 测量，使用文献中的传递系数 (TC) 评估工人的潜在皮肤暴露 (PDE)。与可接受的操作员暴露水平 (AOEL) 相比，结果表明克菌丹的重新进入间隔可能不足以保护手臂、手和腿没有被覆盖的工人。

更新日期：2024-07-22

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