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| Effects of Pesticide Application on Spatial Distribution of Difenoconazole Residue in Celery Field Environment |
| LI Chunyong，REN Pengcheng，LIAN Shaobo，JIN Jing，QIN Shu* |
| Shanxi Agricultural University Shanxi Center for Testing of Functional Agro-Products，Taiyuan 030031，Shanxi，China |
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Abstract To explore the residual spatial distribution characteristics and personnel risk level of difenoconazole in celery farmland environment under different application conditions，treatments were carried out according to different planting patterns，application season，spray hole diameter，spray times，crop height，and pesticide formulation．The gas samples were collected by solution absorption method，and the residues were detected by UPLC-MS/MS in soil，celery and the atmosphere．The results showed that the distribution ratio of difenoconazole in each substrate followed the order of soil ＞ celery ＞ atmosphere under the above application methods．The residual concentration in celery was in the range of 0.382 0 to 0.857 0 mg · kg-1，which was lower than the maximum residue limit（MRL）of 3 mg · kg-1 stipulated in GB 2763—2021．With the increase of celery plant height，the residual distribution proportion of difenoconazole in celery increased，but gradually decreases in soil and atmosphere．Also，the utilization rate of pesticide increased．In addition，the health risk assessment of pesticide applicators has been implemented．It was found that the total residue of difenoconazole in the atmosphere of each treatment ranged from 0 to 0.005 0 g．The pesticide exposure per unit weight of the applicator was 0-0.082 3 mg · kg-1，which was lower than the allowable exposure of the applicator（0.235 8 mg · kg-1）．The corresponding risk coefficients were between 0 and 0.349 1，all of which were less than 1．These results indicated that the inhalation exposure of difenoconazole does not pose an unacceptable risk to persons．
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Received: 14 February 2023
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