In the present survey, a nitrogen-doped amorphous carbon nanocomposite has been prepared simply and eco-friendly from heating an acidic solution of sorbitol and urea. It was used as an efficient sorbent in dispersive solid phase extraction for the extraction of some pesticides (chlorpyrifos, diniconazole, clodinafop–propargyl, oxadiazon, fenpropathrin and penconazole) from fruit juice samples. The method was followed by a dispersive liquid–liquid microextraction procedure for more preconcentration of the analytes. The extracted analytes were determined by gas chromatography–flame ionization detection. Under optimized experimental conditions, relative standard deviations were in the ranges of 3–5% and 5–7% for intra-day (n = 6) and inter-day (n = 4) precisions, respectively, at a concentration of 10 μg L⁻¹ for each analyte. The limits of detection and quantification were in the ranges of 0.89–1.3 and 3.0–4.3 μg L⁻¹, respectively. The linear ranges were achieved in the range of 3.0–2000 μg L⁻¹. Also, enrichment factors and extraction recoveries were obtained in the ranges of 380–455 and 76–91%, respectively. Finally, the developed approach was performed to determine the studied pesticide residues in various fruit juices including pomegranate, sour cherry, grape, orange and apple.

在本次调查中，通过加热山梨糖醇和尿素的酸性溶液，已简单且生态友好地制备了氮掺杂的无定形碳纳米复合材料。它被用作分散固相萃取中的有效吸附剂，用于从果汁样品中萃取某些农药（毒死rif，迪尼康唑，氯地那非-炔丙基，恶虫二酮，苯丙酸菊酯和戊康唑）。该方法之后是分散液-液微萃取程序，可对分析物进行更多的预浓缩。提取的分析物通过气相色谱-火焰电离检测法测定。在优化的实验条件下，相对标准偏差为3-5％和5-7％范围为日内（Ñ  = 6）和日间（Ñ = 4）每种分析物的浓度分别为10μgL ^-1时的精密度。检测限和定量限分别在0.89–1.3和3.0–4.3μgL ^-1之间。线性范围达到3.0–2000μgL ^-1。另外，富集因子和提取回收率分别在380–455和76–91％的范围内。最后，采用开发的方法来确定各种果汁中所研究的农药残留，包括石榴，酸樱桃，葡萄，橙和苹果。