A hybrid monolithic column based on layered double hydroxide-alginate hydrogel for selective solid phase extraction of lead ions in food and water samples. (15th August 2018)

• Record Type: Journal Article
• Authors: Wang, Jing; Yang, Qingfeng; Zhang, Liang; Liu, Manshun; Hu, Na; Zhang, Wentao; Zhu, Wenxin; Wang, Rong; Suo, Yourui; Wang, Jianlong
• Is Part Of: Food chemistry. Volume 257(2018)
• Page Start: 155
• Page End: 162
• Publication Date: 2018-08-15
• Subjects: Layered double hydroxides -- Alginate hydrogel -- Pb(II) -- Solid phase extraction -- Food; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2018.02.143
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Sulfide intercalated hierarchical LDH was prepared with a one-pot hydrothermal method. MoS4 2− facilitate the LDH nanosheets self-assembly and act as heavy metal filter. The LDH-based adsorbent was used for the selective adsorption of Pb 2+ and Cu 2+ . Abstract: 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 −1, 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 2+ in water and drinking samples.