In this work, a graphene oxide-based composite (DABP-GO) was prepared by aminating graphene oxide (GO) with the diazonium salt of 4,4′-diaminobiphenyl (DABP). The DABP-GO composite was characterized by scanning electron microscopy, infrared spectroscopy, and nitrogen adsorption-desorption. The DABP-GO showed to be an effective solid-phase extraction (SPE) adsorbent for carbamate pesticides. A SPE method with the DABP-GO as the adsorbent combined with high-performance liquid chromatography with ultraviolet detection was established to determine trace carbamate residues in vegetable samples (benincasahispida and pakchoi). Under the optimal conditions, the linear range was from 1.0 to 40.0 ng g⁻¹. The limits of detection and limits of quantitation of the six carbamates (metolcarb, arprocarb, carbaryl, isoprocarb, fenobcarb, and diethofencarb) were 0.3–0.5 ng g⁻¹ and 0.9–1.5 ng g⁻¹ for benincasahispida sample and 0.5–1.0 ng g⁻¹ and 1.5–3.0 ng g⁻¹ for pakchoi sample, respectively. The relative standard deviations (RSDs) for the intra-day precision at the analyte concentration of 40 ng g⁻¹ are from 2.3 to 8.2% (n = 5) and the inter-day RSDs (n = 5) are from 4.5 to 9.2%.

中文翻译：

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一种基于氧化石墨烯的复合物，用于从蔬菜中固相萃取氨基甲酸酯类农药

在这项工作中，通过将氧化石墨烯（GO）与4,4'-二氨基联苯（DABP）的重氮盐胺化来制备基于氧化石墨烯的复合材料（DABP-GO）。DABP-GO复合材料的特征在于扫描电子显微镜，红外光谱和氮吸附-脱附。DABP-GO被证明是一种有效的固相萃取（SPE）吸附剂，用于氨基甲酸酯农药。建立了以DABP-GO为吸附剂，结合高效液相色谱和紫外检测的固相萃取方法，用于测定蔬菜样品（benincasahispida和pakchoi）中的痕量氨基甲酸酯残留。在最佳条件下，线性范围为1.0至40.0 ng g ^-1。检测限和六个氨基甲酸酯（速灭威，arprocarb，西维因，异丙威，仲丁威，乙霉威和）为0.3-0.5纳克克定量限^-1和0.9-1.5纳克克^-1为benincasahispida样品和0.5-1.0纳克小菜样品的g ^-1和1.5–3.0 ng g ^-1。当分析物浓度为40 ng g ^-1时，日内精度的相对标准偏差（RSD）为2.3至8.2％（n  = 5），日间RSD（n  = 5）为4.5至9.2 ％。