Occurrence of Pesticide Residues in Han River Basin in 2012 and 2014

Kim, Chan-Sub; Lee, Hee-Dong; Son, Kyeong-Ae; Lee, Eun-Young; Oh, Jin-A

doi:10.5338/kjea.2019.38.4.45

Cited by 3 publications

(2 citation statements)

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“…Kim et al (2017)의 2002년 금강, 만경-동진강에서는 butachlor, diazinon, iprobenfos 및 isoprothiolane 등 수도용 농약이 5~50%로 높은 수준으로 검출되었고 9) , Kim et al (2019)의 2012, 2014년 시기별 한강 주변 수계 모니터링에 서 butachlor, carbofuran, iprobenfos, isoprothiolane, hexaconazole 및 oxadiazon 등이 주로 검출되었다. 10) 2018년 전국 하천수 조사결과에서는 butachlor, chlorantraniliprole, iprobenfos, oxadiazon 및 tricyclazole이 상위 검출농약으로 보고하였다. 11) 그 중 tricyclazole은 벼에서만 사용하도록 등록된 농약으로 모니터링 결과에서 검출횟수가 높았다.…”

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“…6) Iprobenfos는 유기인계 두 농약은 모니터링 결과 검출빈도가 높으며 인체 또는 환 경 중 독성에 대한 우려가 있기 때문에 지속적인 농약의 안전 성 확보를 위해서는 거동 구명 등을 통한 안전관리방안 연구 가 실시할 필요가 있다. 현재까지 두 농약에 대한 환경 중 안 전관리 연구는 모니터링 [9][10][11] , 독성 평가 연구 등이 수행되었 다. 12,[14][15][16] Table1.…”

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Fate of Iprobenfos and Tricyclazole at Paddy Cultivation Environment

Lee,

Jung,

Kim

et al. 2023

J Korean Soc Environ Eng

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Objectives : This study aimed to identify the fate of iprobenfos and tricyclazole in the soil and paddy water during the rice cultivation process and to identify their exposure pathways into surface water.Methods : Both iprobenfos and tricyclazole were sprayed onto two sample sites following the pesticide safety usage guidelines. Residues in the samples. Soil, paddy water, and drainage water samples were collected for 28 days after post-application. Residues were subsequently analyzed using LC-MS/MS.Results and Discussion : The fate of the two pesticides, iprobenfos and tricyclazole, in the rice cultivation environment was influenced by factors such as soil half-life, Koc, water solubility, formulation, and precipitation patterns. Initial concentrations of iprobenfos and tricyclazole in the paddy field near the drainage were 5,774 μg/L and 307 μg/L, respectively, while concentrations in the drain water were 1,850 μg/L and 182 μg/L. Four days after application, the residual concentrations of iprobenfos and tricyclazole in both paddy and drain water ranged from N.D. (Not Detected) to 5.6 μg/L and N.D. to 56 μg/L, respectively, indicating a rapid decline. During the experimental period, the average concentration reduction ratios in drain water near the drainage compared to the drain water were higher for tricyclazole (90%) than for iprobenfos (52%).Conclusion : The soil and water half-life of tricyclazole exceeded that of iprobenfos, leading to a slower rate of concentration reduction. The lower Koc value for tricyclazole suggests enhanced soil desorption due to rainfall, increasing its concentration in paddy fields. The presence of iprobenfos and tricyclazole in surface water is likely due to dispersion during pesticide application. While concentrations diminish owing to the dilution effect when water moves from paddy fields to surface water, it's posited that runoff could affect nearby stream water within seven days post-application.

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