58-巯基改性磁性核壳材料固相萃取-氢化物发生原子吸收光谱法测定水样..docVIP

巯基改性磁性核壳材料固相萃取-氢化物发生原子吸收光谱法测定水样中的痕量汞 李路路，Email: xianggq@126.com 摘要：本文将一种用巯基改性的聚合物固定在Fe3O4@SiO2核壳材料上，并将此种新型材料作为固相萃取剂用快速、经济、有效地检测痕量汞。0.607 mmol·g-1。该新型吸附剂很容易在外磁场作用下从样品溶液中被分离出来。优化了pH值、，Fe3O4@SiO2核壳材料100 mg·g-1（Hg2+）；0.06 ng·mL-1（Hg2+），(RSDs, n = 7, C = 1.0 ng·mL-1)为3.9%。雨水井水和 关键词：磁性材料；固相萃取；汞；氢化物；环境水样[1] Camel V. Spectrochimica Acta PartB-Atomic Spectroscopy, 2003(3): 1177. [2] 宋学军, 徐强, 唐刚, 等. 沈阳师范学院学报, 2000, 18(3): 27Determination of trace mercury in the water samples by Hydride generation-Atomic Absorption Spectrometry after solid-phase extraction on mercapto-modified magnetic microspheres Li Lulu , Xiang Guoqiang*, Jiang Xiuming School of Chemistry and Chemical engineering, Henan University of Technology, Zhengzhou 450001. CHINA Abstract: A new magnetic material immobilized mercapto-modified polymeride was synthesized and it was used as magnetic solid phase extraction (MSPE) adsorbent for quick, economic, and efficient determination of trace mercury. The microspheres were characterized by Fourier transform infrared spectrometry(FT-IR), the amount of mercapto groups on the magnetic material was 0.607 mmol·g-1. The new adsorbent can be easily separated from the aqueous sample solution by applying an external magnetic field. The effects of parameters such as pH of sample solution, concentration and volume of eluent，adsorption and desorption time were optimized and the effects of interfering ions on the separation-preconcentration of analytes were evaluated. Under the optimized conditions, the adsorption capacity of mercapto-modified Fe3O4@SiO2 microspheres was found to be 100 mg·g-1 for mercury. The detection limit of the proposed method was 0.06 ng·mL-1 for mercury with an enrichment factor of 20 and the relative standard deviations (RSD) was 3.9%(n = 7, C = 1.0 ng·mL-1). The proposed method has been successfully applied to the determination of trace Hg in rain water, well water and Wulong gap effluent water using HG-AAS, the recovery of mercury for spiked samples wa