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Uptake and dissipation of metalaxyl-M, fludioxonil, cyantraniliprole and thiamethoxam in greenhouse chrysanthemum

文献类型： 外文期刊

作者： Gong, Wenwen 1 ; Jiang, Mengyun 1 ; Zhang, Tingting 2 ; Zhang, Wei 3 ; Liang, Gang 1 ; Li, Bingru 1 ; Hu, Bin 4 ; Han, Pi 1 ;

作者机构： 1.Beijing Res Ctr Agr Stand & Testing, Beijing 100097, Peoples R China

2.Beijing Univ Chem Technol, Coll Chem Engn, Beijing 100029, Peoples R China

3.Michigan State Univ, Dept Plant Soil & Microbial Sci, E Lansing, MI 48824 USA

4.Beijing Plant Protect Stn, Beijing 100029, Peoples R China

关键词： Chrysanthemum; Pesticide; Uptake; Translocation; Greenhouse; Residue dissipation

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2020 年 257 卷

页码：

收录情况： SCI

摘要： Production of chrysanthemum (Dendranthema grandiflora) in greenhouses often requires intensive pesticide use, which raises serious concerns over food safety and human health. This study investigated uptake, translocation and residue dissipation of typical fungicides (metalaxyl-M and fludioxonil) and insecticides (cyantraniliprole and thiamethoxam) in greenhouse chrysanthemum when applied in soils. Chrysanthemum plants could absorb these pesticides from soils via roots to various degrees, and bioconcentration factors (BCFLS) were positively correlated with lipophilicity (log K-ow) of pesticides. Highly lipophilic fludioxonil (log K-ow = 4.12) had the greatest BCFLS (2.96 +/- 0.41 g g(-1)), whereas hydrophilic thiamethoxam (log K-ow = -0.13) had the lowest (0.09 +/- 0.03 g g(-1)). Translocation factors (TF) from roots to shoots followed the order of TFleaf > TFstem > TFflower. Metalaxyl-M and cyantraniliprole with medium lipophilicity (log K-ow of 1.71 and 2.02, respectively) and hydrophilic thiamethoxam showed relatively strong translocation potentials with TF values in the range of 0.29-0.81, 0.36-2.74 and 0.30-1.03, respectively. Dissipation kinetics in chrysanthemum flowers followed the first-order with a half-life of 21.7, 5.5, 10.0 or 8.2 days for metalaxyl-M, fludioxonil, cyantraniliprole and thiamethoxam, respectively. Final residues of these four pesticides, including clothianidin (a primary toxic metabolite of thiamethoxam), in all chrysanthemum flower samples were below the maximum residue limit (MRL) values 21 days after two soil applications each at the recommended dose (i.e., 3.2, 2.1, 4.3 and 4.3 kg ha(-1), respectively). However, when doubling the recommended dose, the metabolite clothianidin remained at concentrations greater than the MRL, despite that thiamethoxam concentration was lower than the MRL value. This study provided valuable insights on the uptake and residues of metalaxyl-M, fludioxonil, cyantraniliprole and thiamethoxam (including its metabolite clothianidin) in greenhouse chrysanthemum production, and could help better assess food safety risks of chrysanthemum contamination by parent pesticides and their metabolites. (C) 2019 Elsevier Ltd. All rights reserved.

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