Pyrocatechol violet impregnated magnetic graphene oxide hybrid material (PV-MGO) was prepared as magnetic solid phase microextraction for separation and preconcentration of copper before its determination by flame atomic absorption spectrometry. PV-MGO hybrid material was characterized using field emission scanning electron microscope (FE-SEM, SEM-Mapping), scanning transmission electron microscopy (STEM), energy dispersive X-ray (EDX), Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Raman spectroscopy. Effects of various parameters such as pH, eluent type, vortex time, amount of magnetic adsorbent were investigated. Under the optimized conditions the MSPE-FAAS procedure presents limit of detection (LOD) of 4.0 μg L-1, limit of quantification (LOQ) of 13.3 μg L-1, preconcentration factor of 20 and relative standard deviation (RSD) 4.93%. The accuracy of the method was confirmed by the analysis of the certified reference materials (NCS ZC73032 Celery, CRM025-050 metals on soil, TMDA-64.2 fortified water) and addition-recovery tests. The present method was successfully applied to water, black tea and diet supplements.

中文翻译：

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邻苯二酚紫浸渍的磁性石墨烯氧化物，用于磁性固相微萃取水中的铜，红茶和膳食补充剂。

制备了邻苯二酚紫浸渍的磁性氧化石墨烯杂化材料（PV-MGO）作为磁性固相微萃取，用于铜的分离和富集，然后通过火焰原子吸收光谱法测定。使用场发射扫描电子显微镜（FE-SEM，SEM-Mapping），扫描透射电子显微镜（STEM），能量色散X射线（EDX），傅里叶变换红外光谱（FT-IR）对PV-MGO杂化材料进行了表征，X射线衍射（XRD）和拉曼光谱。研究了pH，洗脱液类型，涡旋时间，磁性吸附剂等各种参数的影响。在最佳条件下，MSPE-FAAS程序的检出限（LOD）为4.0μgL-1，定量限（LOQ）为13.3μgL-1，预浓缩系数为20，相对标准偏差（RSD）为4.93％。该方法的准确性通过对认证参考材料（NCS ZC73032芹菜，CRM025-050金属在土壤上，TMDA-64.2强化水）的分析和添加回收试验得以证实。本方法已成功应用于水，红茶和膳食补充剂。