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请各位帮个忙把这篇文献摘要翻译成中文，谢了！ A novel, simple, cost-effective, and sensitive method was developed for the determination of atrazine and its principalmetabolites namely deisopropyl-atrazine (DIA) and deethyl-atrazine (DEA) in water and soil samples using multi-walled carbon nanotubes as solid-phase extraction (SPE) adsorbents coupled with gas chromatography-mass spectrometry (GC-MS). Several condition parameters, such as sample loading flow-rate, eluent and elution volume, extractant and ratio of extraction solvent to sample,were optimized to achieve good sensitivity and precision for the extraction and elution of analytes. A methanol/water solution (50%, v/v) was used to extract atrazine, DIA and DEA from soil. After the extracts went through SPE cartridges (packed with multi-walled carbon nanotubes) at a flow-rate of 4 mL min.1, the analyteswere eluted by 4mL ethyl acetate at the rate of 1mLmin.1 under a vacuumpump.The limit of detection (S/N=3) of the proposed method was 0.02 μg kg.1 for atrazine in water and 0.3 μg kg.1 in soil; 0.04 μg kg.1 for DIA in water and 1.0 μg kg.1 in soil; 0.05 μg kg.1 for DEA in water and 0.8 μg kg.1 in soil. Mean recoveries were in the range of 72.27–109.68%, and the reproducibility was accepted (RSD b13%) under the optimum conditions. This developed method was applied to determine the analytes in real environmental samples, and the concentrations of atrazine were 0.77–10.83 μg kg.1, while DEA and DIA were not detected. |
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