In the present work, dispersive micro-solid phase extraction (D-μ-SPE) method using magnetic graphene oxide tert-butylamine (GO/Fe3O4/TBA) nanocomposite, as an efficient sorbent, was applied for determining 2,4-dichlorophenoxyacetic acid (2,4-D) in water and food samples. Detection was carried out using high-performance liquid chromatography (HPLC) instrument. Influential parameters of D-μ-SPE such as sorbent and its amount, elution solvent and its volume, adsorption and desorption times and pH of sample solution were investigated and optimized. Under the optimized conditions, limit of detection and quantitation values were 0.007 and 0.02 μg/mL, respectively. Recovery data for several real samples were obtained within the range of 88.0-94.0% with a relative standard deviation (RSD) less than 7.5%. The proposed method was successfully applied to quantitative determination of 2,4-D in several vegetables and water samples.

中文翻译：

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使用改良的氧化石墨烯吸附剂和高效液相色谱法测定食品和水样中的2,4-二氯苯氧基乙酸。

在本工作中，采用磁性氧化石墨烯叔丁胺（GO / Fe3O4 / TBA）纳米复合材料作为高效吸附剂的分散微固相萃取（D-μ-SPE）方法测定2,4-二氯苯氧基乙酸（2,4-D）在水和食物样品中。使用高效液相色谱（HPLC）仪器进行检测。研究和优化了D-μ-SPE的影响参数，如吸附剂及其用量，洗脱溶剂及其体积，吸附解吸时间和样品溶液的pH值。在最佳条件下，检测限和定量值分别为0.007和0.02μg/ mL。在88.0-94.0％的范围内获得了几个真实样品的回收率数据，相对标准偏差（RSD）小于7.5％。