新型基质固相萃取重金属离子分析及残留关联性

A new matrix solid-phase for heavy metal ion extraction and residual testing

化学改性壳聚糖结合特征膨润土制备新型吸附基质功能材料,设计并制作接续式萃取柱管,进而填料制备新型基质固相萃取柱。正交试验分析山核桃Carya cathayensis叶中重金属离子作为前期指示物,考察新型基质固相萃取柱对山核桃叶中重金属离子的提取效能及与果实中重金属离子残留量的关联性。结果表明:新型基质固相萃取柱能较好提取山核桃叶中重金属离子,提取效能为原子吸收分光光度法(AAS)所验证。正交实验获得了新型基质固相萃取柱分离镍离子(Ni2+),铜离子(Cu2+)的最佳条件,实验数据显示山核桃叶与果实中2种重金属离子具有一定相关性,山核桃叶与果实中的镍离子(Ni2+),铜离子(Cu2+)分别为经典方法测试的91.1%和77.8%,89.1%和76.9%。提出前期指示物预测、监控山核桃中重金属离子含量为有效方法。所得结果可为固相萃取技术、重金属离子残留关联性相关研究提供有益参考。

Chemical modification of chitosan combined with characteristic bentonite was used to prepare new matrix adsorption and functional materials with a subsequent columnar extraction tube being designed and produced. Then, the new matrix solid-phase dispersion column was packed and prepared. With an orthogonal experimental design, metallic ions, used as prior indicators in Carya cathayensis leaves, were analyzed. Separation efficiency of the new matrix solid-phase dispersion column and relevance of the heavy metal ion residual content between leaves and fruit were determined using atomic absorption spectrophotometry. Results of the atomic absorption spectrophotometry showed that compared with classical methods, the new matrix solid-phase extraction column separated heavy metal ions in pecans showing a dependent relationship in leaves for heavy metal ions of Ni^2＋ （91.1%） and Cu^2＋ （77.8%） and in fruit of Ni^2＋ （89.1%） and Cu^2＋ （76.9%）. These results could provide a reference for studying solid-phase extraction technology and residual relevance of heavy metals. [Ch, 2 fig. 7 tab. 22 ref.]