Residue and Safety of Tolfenpyrad Used in Tea Plantations
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摘要: 为探讨唑虫酰胺茶园使用安全性, 在福安福云6号绿茶品种茶园开展残留消解动态试验。结果表明, 在54270g·hm-2施用剂量下, 原始附着量和原始残留量随施用剂量的提高线性增加, 烘干不能使残留消解;在108、162、216g·hm-2等推荐使用剂量下, 5月份时唑虫酰胺在茶树上的原始残留量高达33.7367.58mg·kg-1, 降解速度较慢, 药后10d的残留量方低于20mg·kg-1;在茶园的消解规律符合一级动力学方程, 半衰期长达4.025.00d;同一使用剂量在不同季节施药后的残留量有较大差异, 9月份的原始残留量显著高于5月份。研究认为唑虫酰胺在茶园使用的食品安全性较低, 对于国内市场, 建议在茶叶上的残留限量暂定为20mg·kg-1, 安全间隔期15d。Abstract: Degradation dynamics and food safety of residual Tolfenpyrad in the tea, Fuyun 6 (Camellia sinensis) , were studied in a field test in Fu′an, Fujian.The results showed that the residue concentrations in both fresh and baked tea leaves increased linearly with Tolfenpyrad applications in the concentrations of 54-270g·hm-2, and that the residues did not degrade significantly during the baking process.When the recommended application concentrations of Tolfenpyrad at 108, 162, or 216g·hm-2 for the month of May was applied, the initial residues ranged from 33.73mg·kg-1to 67.58mg·kg-1, and reduced to 20mg·kg-1 after 10 days.It fitted the firstorder kinetics, with a T1/2ranging from 4.02 dto 5.00 d.The residue level in teas was found significantly lower in May than September during ayear.The current safe application requirement on Tolfenpyrad was low.For the domestic market, the MRL was recommended to be 20mg·kg-1, and a pre-harvest time, 15 d.
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Key words:
- Tolfenpyrad /
- tea /
- pesticide residues /
- degradation dynamics /
- safety
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