摘要
在生长均匀的茶园喷施氰戊菊酯(fenvalerate),采摘施药后2 h和1 h、2 h、3 h、5 h、7 h、9 h、14 h、21天的茶树鲜叶加工成绿茶,用气相色谱法测定成茶、茶汤和茶渣中反式氰戊菊酯和顺式氰戊菊酯的含量,研究了氰戊菊酯在成茶、茶汤中的残留动态。结果表明:反式氰戊菊酯和顺式氰戊菊酯在成茶中的残留水平随施药间隔天数的增加呈下降趋势,20 mL/667 m2施药剂量下,分别由施药当天2 h的9.40 mg/kg和17.51 mg/kg减小到第21天的1.07 mg/kg和1.53 mg/kg,消解幅度为88.62%和91.26%,40 mL/667 m2施药剂量下,分别由施药当天2 h的20.37 mg/kg和38.67 mg/kg减小到第21天的1.94 mg/kg和3.06 mg/kg,消解幅度为90.49%和92.09%。茶汤中氰戊菊酯含量(y)与成茶中氰戊菊酯含量(x)呈二项式函数关系,反式氰戊菊酯的函数关系为y=-0.0007x2+0.0242x,顺式氰戊菊酯的函数关系为y=-0.0002x2+0.0114x。按我国标准饮茶摄入的氰戊菊酯占每日允许摄入量的0.049%,足以达到保护人体健康水平的要求。而按欧盟的标准,饮茶摄入的氰戊菊酯占每日允许摄入量的0.0019%,即在10-5水平上,这样的风险水平已接近对非阈效应化学物质的风险控制水平(10-6)。
Fenvalerate was sprayed in a growing equably tea farm. The green shoots was harvested from treated plots at 2 h and 1 h,2 h ,3 h ,5 h, 7 h, 9 h ,14 h, 21 days after the treatment, and manufactured into green tea. The concentration of fenvalerate-trans and fenvalerate-cis in made tea,its infusion and infused leaves were determined by gas chromatography. And dissipation behavior of fenvalerate residue in made tea and its infusion was investigated. Results indi-cated that the residue level of fenvalerate-trans and fenvalerate-cis in made tea decreased gradually while the plucking interval increased. The residue of fenvalerate-trans and fenvalerate-cis in made tea from 9.40 mg/kg and 17.51 mg/kg at 2 h after the treatment decreased to 1.07 mg/kg and 1.53 mg/kg at 21 days at the dose of 20 mL/667 m^2 , and from 20.37 mg/kg and 38.67 mg/kg at 2 h decreased to 1.94 mg/kg and 3.06 mg/kg at 21 days at the dose of 40 mL/667 m^2. The concentration of fenvalerate residue in tea infusion（y） show quadratic function with that in made tea（x）. Quadratic equation is y = - 0. 0007x^2 ＋ 0. 0242x （fenvalerate-trans） and y = - 0. 0002x^2 ＋ 0.0114x （ fenvalerate-cis）. According to fenvalerate MRL（ maximum residues levels） in tea in China, the percentage of fenvalerate residues intake amounts possibly by drinking tea infusion comparing with ADI is 0. 049 % , which is sufficient for protecting human health. And according to fenvalerate MRL in tea in EU, the percentage of fenvalerate residues intake amounts comparing with ADI （acceptable daily intake）, is 0. 0019 %, which is on 10-5 level and near the risk control level （10-6） of ＂threshold effect＂ chemical.
出处
《激光生物学报》
CAS
CSCD
2007年第4期469-474,共6页
Acta Laser Biology Sinica
基金
国家科技支撑计划"食品中农药残留风险评估技术研究"项目(2006BAK02A04)
科技部"十五"重大专项"食品安全关键技术"基金项目(11-7)
关键词
氰戊菊酯
残留
茶叶
茶汤
最大残留限量
评价
fenvalerate
residue
tea
tea infusion
maximum residues levels （MRL）
evaluation
