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KMID : 0881720100250020091
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Journal of Food Hygiene and Safety
2010 Volume.25 No. 2 p.91 ~ p.99
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The Degradation patterns of Two Pesticides in Spinach by Cultivation, Storage and Washing
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Seo Jung-Mi
Ha Dong-Ryong
Kim Eun-Sun
Oh Mu-Sul
Lee Hyang-Hee
Shin Hyeon-Woo
Park Jong-Jin
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Abstract
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Two pesticides commonly used in spinach were subjected to a field residue trial to ensure safety of terminal residues in the harvest. The residual patterns of two pesticides, which were Azoxystrobin and chlorpyrifos were examined after applying with the recommended dose and their DT50 were calculated. Also degradation patterns of pesticides at storage 4oC were compared to those at 20oC, and removal rates of pesticides by washing spinach with water were measured. Biological half-lives of azoxystrobin and chlorpyrifos were 3.2~3.8 and 3.8~4.7 days, respectively. During the storage period, the degradation patterns were appeared more obviously at 20oC than 4oC. Removal rates of azoxystrobin and chlorpyrifos were 9.6~90.0% and 17.7~85.8% by various washing methods.
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KEYWORD
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spinach, azoxystrobin, chlorpyrifos, cultivation, storage, washing
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