| 魏鹏,曹梦超,王全胜,刘雅楠,王蒙岑,朱国念.QuEChERS-PSA-气相色谱法分析联苯菊酯·啶虫脒微乳剂在茶园中的残留特征[J].农业环境科学学报,2015,34(10):2032-2038. |
| QuEChERS-PSA-气相色谱法分析联苯菊酯·啶虫脒微乳剂在茶园中的残留特征 |
| Analysis of Residual Profiles of Bifenthrin and Acetamiprid in Tea Garden by QuEChERS-PSA-GC |
| 投稿时间：2015-04-20 |
| DOI：10.11654/jaes.2015.10.028 |
| 中文关键词: 联苯菊酯 啶虫脒 茶园 残留特征 QuEChERS-PSA 气相色谱 |
| 英文关键词: bifenthrin acetamiprid tea dissipation dynamics QuEChERS-PSA GC |
| 基金项目:中央高校基本科研业务费专项资金(517302*172210151) |
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| 中文摘要: |
| 利用QuEChERS-PSA结合气相色谱电子捕获检测器(GC-ECD)建立了同时检测茶叶及土壤中联苯菊酯和啶虫脒的分析方法,并探明了4.5%联苯菊酯·啶虫脒微乳剂在茶园中的降解动态特征.在优化的GC-ECD条件下,0.01~1 mg·kg-1范围内的联苯菊酯和啶虫脒仪器响应值与其质量浓度呈良好线性关系(r=0.997 5~0.998 9),仪器最小检出量为2.0×10-11 g.添加回收率试验表明,在茶叶及土壤空白样品基质中添加0.01~1 mg·kg-1的联苯菊酯和啶虫脒,平均回收率为89.2%~108.1%,相对标准偏差为2.2%~11.3%,方法的定量限为0.01 mg·kg-1,说明该方法准确度、精密度和灵敏度均较好,可用于同时检测茶园中痕量水平的联苯菊酯和啶虫脒残留.田间试验结果表明,4.5%联苯菊酯·啶虫脒微乳剂在茶叶及土壤中的消解动态曲线符合一级动力学方程,联苯菊酯和啶虫脒在茶叶和土壤中的半衰期分别为5.6~13.1 d和 7.2~8.7 d,说明联苯菊酯与啶虫脒在茶园中的消解速率相近,在环境中均属于易降解化合物,但其所存在的膳食风险仍需结合茶叶加工因子试验及中国地区膳食结构作进一步全面评估. |
| 英文摘要: |
| In this work, a method for determination of bifenthrin and acetamiprid in tea and soil using QuEChERS-PSA and GC-ECD(gas chromatography-electron capture detector) was developed, and the residual profiles of 4.5% bifenthrin-acetamiprid microemulsionin(ME)in tea garden were then investigated. Under the optimized conditions of GC-ECD, a good linearity(r=0.997 5~0.998 9) for standard solutions over the concentration range of 0.01~1 mg·kg-1 was obtained with the limit of detection(LOD) of 2.0×10-11 g. The average recoveries of tea and soils fortified with three levels from 0.01 mg·kg-1 to 1 mg·kg-1 bifenthrin and acetamprid ranged from 89.2% to 108.1%, with relative standard deviation of 2.2% to 11.3% and LOQ of 0.01 mg·kg-1, indicating that the developed method has considerable accuracy, precision and sensitivity, and is applicable for detecting the trace amounts of these pesticides in tea garden. The field trial showed that dynamics of 4.5% bifenthrin-acetamiprid ME in tea and soil fit the first-order kinetic equation, with the half-lives of bifenthrin and acetamiprid being 5.6~8.7 days and 7.9~8.6 days in tea and 8.5~13.1 days and 7.2~8.7 days in soil, respectively, suggesting that parathyroid and nitromethylene heterocyclic compounds have similar half-life and both belong to readily degradable insecticides. However, the health risks posed by these pesticides in tea need to be further evaluated in combination with various tea-processing factors and the dietary patterns in China. |
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