The current study is focused on the in situ synthesis of a carbon aerogel (CA)-based solid-phase microextraction (SPME) fiber coating on stainless steel wire and evaluation of the suitability of CAs as SPME coating materials for the analysis of selected organophosphorus pesticides (OPPs) contained in environmental samples. A CA-based coating was obtained by pyrolyzing organic aerogels, which were prepared by the sol–gel polymerization of formaldehyde and 5-methylresorcinol, an oil shale processing by-product. The results demonstrated, for the first time, the in situ synthesis of a CA-based SPME fiber coating on stainless steel wire and its suitability for the extraction and preconcentration of six OPPs. Main parameters affecting the extraction efficiency were investigated and optimized. The direct immersion (DI)-SPME procedure combined with gas chromatography-mass spectrometry (GC-MS) for the simultaneous analysis of selected OPPs was successfully applied to the efficient and sensitive determination of analytes of interest in environmental matrices of honey and natural water samples. The developed CA-coated SPME fiber showed good linearity (R² = 0.981–0.994), low detection limits (0.11–0.83 μg L⁻¹) and satisfactory single fiber and fiber-to-fiber reproducibilities (8.8–12.3%, n = 5 and 11.4–17.2%, n = 3). The performance of the CA-coating was compared with that of commercially available SPME fiber coatings.

中文翻译：

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碳气凝胶基固相微萃取涂层，用于分析有机磷农药

当前的研究重点是在不锈钢丝上原位合成基于碳气凝胶（CA）的固相微萃取（SPME）纤维涂层，并评估CA作为SPME涂层材料对所选有机磷农药分析的适用性（OPP）包含在环境样本中。通过热解有机气凝胶获得了基于CA的涂层，这些气凝胶是通过甲醛和油页岩加工副产物5-甲基间苯二酚的溶胶-凝胶聚合制备的。结果首次证明了原位CA的不锈钢丝SPME纤维涂层的合成及其对六种OPP的萃取和预浓缩的适用性。研究和优化了影响提取效率的主要参数。直接浸入（DI）-SPME方法与气相色谱-质谱（GC-MS）结合用于同时分析选定的OPP已成功地应用于高效和灵敏地测定蜂蜜和天然水样品的环境基质中的目标分析物。发达的CA涂层SPME纤维表现出良好的线性度（R ² = 0.981–0.994），低检测限（0.11-0.83μgL ^-1）和令人满意的单纤维和纤维间重现性（8.8–12.3％，n = 5和11.4–17.2％，n = 3）。将CA涂层的性能与市售SPME纤维涂层的性能进行了比较。