A selective cavitand-based solid-phase microextraction coating was synthesized for the determination of nitroaromatic explosives and explosive taggants at trace levels in air and soil. A quinoxaline cavitand functionalized with a carboxylic group at the upper rim was used to enhance selectivity toward analytes containing nitro groups. The fibers were characterized in terms of film thickness, morphology, thermal stability, and pH resistance. An average coating thickness of 50 (±4) μm, a thermal stability until 400 °C, and an excellent fiber-to-fiber and batch to batch repeatability with RSD lower than 4% were obtained. The capabilities of the developed coating for the selective sampling of nitroaromatic explosives were proved achieving LOD values in the low ppbv and ng kg–1 range, respectively, for air and soil samples.
为测定空气和土壤中的痕量硝基芳香族炸药和爆炸标记物,合成了一种基于空穴剂的选择性固相微萃取涂层。为了提高对含有硝基的分析物的选择性,在上边缘使用了羧基官能化的
喹喔啉空穴剂。这种纤维在薄膜厚度、形态、热稳定性和耐 pH 值等方面都具有特征。平均涂层厚度为 50 (±4) μm,热稳定性可达 400 °C,纤维间和批次间的重复性极佳,R
SD 低于 4%。事实证明,所开发的涂层具有选择性采样硝基芳香族炸药的能力,在空气和土壤样品中的 LOD 值分别为低 ppbv 和 ng kg-1。