Multi-walled carbon nanotubes (MWCNT) were used as an adsorbent in a solid-phase extraction (SPE) process to detect pesticide residues in water. The MWCNT were prepared with polyvinyl pyrrolidone and polysilazane liquid by pyrolysis. The morphology and integrity of MWCNT were characterized by Fourier-transform infrared spectroscopy, scanning electron microscope, X-ray diffractometer, and transmission electron microscope. Water samples including pesticides were passed through cartridges containing the MWCNT, where pesticides in the water were concentrated by adsorption. The analytical method for the detection of pesticides in dilute solution was proposed by using MWCNT as an adsorbent with gas chromatography/mass spectrometry for quantification of fenpropathrin, alphacypermethrin, and deltamethrin. The adsorption amounts of pesticides on the MWCNT were analyzed to identify the effects of temperature, flow rate, acidity, ionic strength, and analytes volume. The MWCNT-packed cartridges withstand a high load of water samples in the lowest concentration of 0.03 ng/L passing through for the extraction of pesticide residues at trace levels when compared with the commercial C18 cartridges, due to their large surface area and adsorption capacity.

中文翻译：

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碳纳米管-气相色谱-质谱联用提取和测定水中农药残留

多壁碳纳米管 (MWCNT) 被用作固相萃取 (SPE) 过程中的吸附剂，以检测水中的农药残留。多壁碳纳米管是用聚乙烯吡咯烷酮和聚硅氮烷液体通过热解制备的。通过傅里叶变换红外光谱、扫描电子显微镜、X 射线衍射仪和透射电子显微镜对多壁碳纳米管的形貌和完整性进行了表征。包括农药的水样通过含有 MWCNT 的小柱，水中的农药通过吸附浓缩。提出了以多壁碳纳米管为吸附剂，采用气相色谱/质谱联用技术对甲氰菊酯、甲氰菊酯和溴氰菊酯进行定量分析，检测稀溶液中农药的分析方法。分析了农药在 MWCNT 上的吸附量，以确定温度、流速、酸度、离子强度和分析物体积的影响。与商用 C18 小柱相比，MWCNT 填充小柱具有大的表面积和吸附能力，可承受最低浓度为 0.03 ng/L 的高负载水样，用于提取痕量水平的农药残留。