Zhou Qingxiang, Ding Yujie, Xiao Junping
School of Chemistry and Environmental Sciences, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, 453007, People's Republic of China.
Anal Bioanal Chem. 2006 Aug;385(8):1520-5. doi: 10.1007/s00216-006-0554-7. Epub 2006 Jul 4.
This paper describes a novel method for sensitive determination of thiamethoxam, imidacloprid and acetamiprid based on solid-phase extraction with multiwalled carbon nanotubes as the packed materials. Factors that maybe influence the enrichment efficiency, such as sample flow rate, sample pH, and sample volume, were investigated in detail. Under the optimized conditions, the detection limits of thiamethoxam, imidacloprid and acetamiprid were 6.1, 5.4 and 6.7 ng L(-1), respectively. The experimental results indicated that there was good linearity (R2>0.9993) over the range of 0.08 approximately 100 ng mL(-1) and good reproducibility with the relative standard deviations over the range of 0.7 approximately 1.1% (n=6). The proposed method has been applied to the analysis of real-world water samples, and satisfactory achievements were obtained. The average spiked recoveries were in the range of 87.5 approximately 109.8%. All the results indicated that the proposed method could be used for the simultaneous determination of the three pesticides in environmental water samples at trace levels.
本文描述了一种基于以多壁碳纳米管为填充材料的固相萃取法灵敏测定噻虫嗪、吡虫啉和啶虫脒的新方法。详细研究了可能影响富集效率的因素，如样品流速、样品pH值和样品体积。在优化条件下，噻虫嗪、吡虫啉和啶虫脒的检测限分别为6.1、5.4和6.7 ng L(-1)。实验结果表明，在0.08至100 ng mL(-1)范围内具有良好的线性关系（R2>0.9993），相对标准偏差在0.7至1.1%范围内具有良好的重现性（n=6）。所提出的方法已应用于实际水样的分析，并取得了满意的结果。平均加标回收率在87.5至109.8%范围内。所有结果表明，该方法可用于痕量水平下环境水样中三种农药的同时测定。
