College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China.
Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Northwest Institute of Plateau Biology, The Chinese Academy of Sciences, Xining 810008, Qinghai, China.
Food Chem. 2018 Dec 15;269:9-15. doi: 10.1016/j.foodchem.2018.06.137. Epub 2018 Jun 28.
Here, a solid/liquid phase extraction mode was used for the preconcentration of Pb(II) in water and food samples through a biomass reinforced graphene oxide (BGO) membrane. Taking advantage of the two modes, the synergistic effect of BGO membrane (solid extraction) and organic solvent (liquid extraction) enhances the extraction efficiency toward target ion. In detail, the effect of composition parameters in BGO membrane and experiment conditions such as pH, eluent types, elution time and sample volume were optimized, as well as shows no obvious interference toward different competing ions. Under the optimal experiment conditions, the limit of detection, precision as RSD% of this method were found to be 0.84 μg L and 4.65%, respectively. Moreover, the large enrichment factor of BGO membrane demonstrates the applicability of the use of large sample volumes. Furthermore, the method was successfully verified by analyzing spiked Pb(II) in water and food samples.
在此，通过生物质增强氧化石墨烯（BGO）膜采用固/液萃取模式对水样和食品样中的 Pb(II)进行预浓缩。利用这两种模式，BGO 膜（固相萃取）和有机溶剂（液相萃取）的协同作用增强了目标离子的萃取效率。具体而言，优化了 BGO 膜的组成参数和实验条件（如 pH 值、洗脱剂类型、洗脱时间和样品体积），并且对不同竞争离子没有明显干扰。在最佳实验条件下，该方法的检出限和精密度（RSD%）分别为 0.84μg/L 和 4.65%。此外，BGO 膜的大富集因子表明可以适用于大体积样品的使用。进一步，通过分析水样和食品样中加标 Pb(II)验证了该方法的准确性。
