中文摘要：

采用共沉淀法制备了磁性Fe3O4颗粒,在其表面包覆一层SiO2后,利用3-氨丙基三甲氧基硅烷对其表面进行修饰,制备了氨基键合磁性硅球（NH2-Fe3O4/SiO2）,并表征了材料的表面功能基团、形态、粒径分布以及磁性特质.将该磁性硅球作为磁固相萃取（MSPE）材料,与火焰原子吸收光谱法（FAAS）联用,建立了环境水样中铜离子的定量分析方法.该方法检出限为0.50ng/mL,定量限为1.66ng/mL.该方法用于长江水中铜离子的分析,加标回收率为85.6%,相对标准偏差为8.2%.

英文摘要：

This paper prepared Fe3O4 microspheres by co-precipitation method,after coating with a layer of silica on their surface,magnetic silica particles were resulted.The obtained magnetic silica particles were modified with 3-aminopropyl trimethoxysilane to obtain composite materials（NH2-Fe3O4/SiO2）.The resultant sorbent materials were characterized by some methods to research their feature,such as surface functional groups,morphology,particle size distribution and magnetic properties and so on.The synthesized NH2-Fe3O4/SiO2 mirospheres were used as magnetic solid-phase extraction materials,coupled with flame atomic absorption spectrometry（FAAS） to quantitative detection of copper ion in water samples.The limit of detection is 0.50 ng/mL and the limit of the quantitation is 1.66 ng/mL.Finally,the method was successfully applied to analyze copper ions in Changjiang river,the recovery is 85.6% and the relative standard deviation is 8.2%.