ZIF-8派生含氮多孔碳作为吸附剂固相萃取茶叶样品中6种痕量金属离子  

ZIF-8 Derived Nitrogen-Containing Porous Carbon as Adsorbent for Solid-Phase Extraction of Six Metal Ions from Tea samples

作　　者：刘松浩 臧晓欢[1] 常青云 梁伟倩 吴桐 王春[1] 王志[1] LIU Song-Hao;ZANG Xiao-Huan;CHANG Qing-Yun;LIANG Wei-Qian;WU Tong;WANG Chun;WANG Zhi(（Department of Chemistry,College of Science,Hebei Agricultural University,Baoding 071001,China)

机构地区：[1]河北农业大学理学院化学系,保定071001

出　　处：《分析化学》2018年第8期1282-1288,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(Nos.31471643;31571925;31671930);河北省自然科学基金项目(No.C2018204076);河北省高等学校科学技术研究青年基金项目(No.QN2017085)资助~~

摘　　要：以金属有机骨架化合物(ZIF-8)派生含氮纳米多孔碳(ZIF-8-NC)为固相萃取吸附剂,建立了火焰原子吸收光谱法测定茶叶样品中痕量Cu^(2+)、Pb^(2+)、Cd^(2+)、Cr^(3+)、Ni^(2+)、Co^(2+)的分析方法。ZIF-8-NC具有较大的比表面积(1239.8 m^2/g),既存在微孔又存在介孔,且材料表面存在可与金属离子配位的含氮基团,所以此材料对金属离子有很好的吸附性能。对影响金属离子富集效率的主要因素,如配位剂的种类、样品溶液pH值、样品体积、解吸剂种类、解吸剂体积等进行了优化。在优化条件下,6种金属离子的检出限为0.05~0.07μg/kg,线性相关系数在0.9988~0.9993范围内。各金属离子的加标回收率为76.8%~101%,RSD在5.9%~11.3%之间。本方法适用于复杂基质样品中金属离子的测定,具有操作简便、灵敏度高和环境友好的特点。A metal organic skeleton ZIF-8 derived nitrogen-containing porous carbon（ZIF-8-NC）was used as the adsorbent for the solid-phase extraction of Cu^2＋,Pb^2＋,Cd^2＋,Cr^3＋,Ni^2＋,Co2＋from tea samples prior to flame atomic absorption spectrometric detection.The ZIF-8-NC had a large specific surface area of 1240 m^2/g due to the presence of plenty of micropores and mesopores.Its high adsorption capability could be attributed to the surface nitrogen-containing groups which coordinated with metal ions.The effects of important experimental parameters on the extraction efficiency were investigated and optimized.Under the optimal conditions,the limits of detections（LODs）were found to be 0.05-0.07μg/kg.The correlation coefficients were between 0.9988 and 0.9993.The method recoveries of the analytes in the spiked samples were 76.8%-101.0%,with relative standard deviations ranging from 5.9%to 11.3%.The established method provides a new and environmentally friendly approach for determination of metal ions in complex matrix samples.

关 键 词：金属有机骨架材料 氮纳米多孔碳 固相萃取 金属离子 火焰原子吸收法 茶叶 

分 类 号：TQ424[化学工程] TS272.7[农业科学—茶叶生产加工]