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 Aug 15;257:155-162. doi: 10.1016/j.foodchem.2018.02.143. Epub 2018 Feb 26.
In order to develop an accurate and precise determination method based on solid phase extraction of Pb(II) in food and water samples, a hybrid monolithic column based on layered double hydroxides (LDHs) nanosheets-alginate hydrogel has been synthesized. Combining the advantages of porous 3D framework of hydrogel with selective adsorption of LDHs toward Pb(II), the hydrogel-based hybrid monolithic column shows enhanced enrichment selectivity and efficiency for target ions. Effects of hydrogel composition, pH, concentration and type of eluent, sample volume, and interfering ions on the recoveries of the analytes were also investigated. Under the optimal experiment conditions of method, the limit of detection, preconcentration factor and precision as RSD% are found to be 0.39 μg L, 53.7 and 2.65%, respectively. Trace Pb(II) can be quantitatively preconcentrated at pH 6.0 with recoveries >97%. Finally, the method was successfully verified by analyzing spiked Pb in water and drinking samples.
为了开发一种基于固相萃取的食品和水样中 Pb(II)的准确、精确的测定方法，合成了一种基于层状双氢氧化物 (LDHs)纳米片-藻酸盐水凝胶的混合整体柱。该水凝胶基混合整体柱结合了水凝胶多孔 3D 骨架与 LDHs 对 Pb(II)的选择性吸附的优点，对目标离子表现出增强的富集选择性和效率。还研究了水凝胶组成、pH 值、洗脱液浓度和类型、样品体积和干扰离子对分析物回收率的影响。在方法的最佳实验条件下，检测限、富集因子和精密度（RSD%）分别为 0.39μg/L、53.7 和 2.65%。在 pH 6.0 下可以定量富集痕量 Pb(II)，回收率>97%。最后，该方法通过分析水中和饮用样品中的加标 Pb 得到了验证。
