共 30 条
Dissipation and residue of dimethomorph in potato plants produced and dietary intake risk assessment
被引:24
作者:
Yang, Liupeng
[1
]
Zheng, Qun
[1
]
Lin, Sukun
[1
]
Wang, Yongqing
[1
]
Zhu, Qizhan
[1
]
Cheng, Dongmei
[2
]
Chen, Jianjun
[3
,4
]
Zhang, Zhixiang
[1
]
机构:
[1] South China Agr Univ, Key Lab Nat Pesticide & Chem Biol, Minist Educ, Guangzhou, Peoples R China
[2] South China Agr Univ, Guangdong Biol Pesticide Engn Technol Res Ctr, Guangzhou, Peoples R China
[3] Univ Florida, Dept Environm Hort, Gainesville, FL 32703 USA
[4] Univ Florida, Midflorida Res & Educ Ctr, Inst Food & Agr Sci, Apopka, FL 32703 USA
基金:
国家重点研发计划;
关键词:
Accumulation rate;
transportation behaviour;
dietary intake risk;
dimethomorph;
HPLC;
potato;
FUNGICIDE DIMETHOMORPH;
SOIL;
QUECHERS;
GRAPE;
METALAXYL;
BLIGHT;
D O I:
10.1080/03067319.2020.1737037
中图分类号:
O65 [分析化学];
学科分类号:
070302 ;
081704 ;
摘要:
Late blight is a potentially devastating disease of potato. Dimethomorph has been widely used for preventing and controlling this disease. However, there is little information on dimethomorph residue in potato and the production soil. To address this issue, the present study developed a method for accurate analysis of dimethomorph using high-performance liquid chromatography. A linearity that had a determination coefficient of 0.9998 was established based on dimethomorph concentrations from 0.05 to 10.0 mg/L. The recovery rates ranged from 76.61% to 109.11%. The limit of detection and the limit of quantification were 0.02 mg/kg and 0.05 mg/kg, respectively. Potato production experiments were then carried out in three provinces of China, and dimethomorph was applied through a foliar spray. The established method was used for analysing the uptake, dissipation, and residues of dimethomorph in potato leaves and tubers and also in soils. Results showed that foliar spray of dimethomorph was translocated to tubers and generally within 2 days. The half-lives of dimethomorph in potato leaves, tubers, and soil ranged from 2.65 to 4.20, 1.79 to 3.71, and 4.62 to 9.0 days, respectively. The risk assessment of dietary exposure showed that all of the risk index values and the hazard quotient were less than 100%, indicating that foliar spray of dimethomorph on potato at 1.5 times the recommended minimum dosages poses little risk for consumption of the tubers in the three provinces of China.
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页码:1332 / 1344
页数:13
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