AuNPs-Al_2O_3复合材料固相萃取天然水体中总溶解性汞  

Solid phase extraction based on gold nanoparticle-aluminum oxide for the enrichment of ultratrace total mercury in nature water

作　　者：马冉冉 王振华[2] 薛富民 李锋[1] 李大鹏[1] MA Ranran;WANG Zhenhua;XUE Fumin;LI Feng;LI Dapeng(Key Laboratory of Food Processing Technology and Quality Control in Shandong Province,College of Food Science and Engineering,Shandong Agricultural University,Tai'an,271018,China;Shandong Analysis and Test Center,Qilu University of Technology(Shandong Academy of Sciences),Jinan,250014,China)

机构地区：[1]山东农业大学食品科学与工程学院山东省高校食品加工技术与质量控制重点实验室,泰安271018 [2]齐鲁工业大学(山东省科学院)山东省分析测试中心,济南250014

出　　处：《环境化学》2019年第3期581-588,共8页Environmental Chemistry

基　　金：国家自然科学基金(21277084);山东省重点研发计划(2016GSF117015);山东"双一流"计划(SYT2017XTTD04)资助~~

摘　　要：纳米金-氧化铝(AuNPs-Al_2O_3)复合材料作为固相萃取材料用于富集环境水体中总溶解性汞.纳米金负载于氧化铝表面防止其团聚,同时有利于吸附剂分离.纳米金-氧化铝复合物可以吸附无机汞及有机汞,并将其转化为元素汞(Hg^0),经HCl洗脱后使用原子荧光测定总汞含量.考察了影响总汞富集与测定的因素,包括待测样品pH、洗脱液种类和用量、萃取时间以及干扰离子等.在最佳的萃取条件下,水中总汞的检出限为0.3 ng·L^(-1),富集倍数为196(400 mL样品).线性范围为1.0—40 ng·L^(-1),相关系数为0.998.结果表明,纳米金-氧化铝纳米复合材料具有成本低、效率高及稳定性高的特点,可以应用于环境水体中总溶解性汞的日常测定.A gold nanoparticle-aluminum oxide (AuNPs-Al2O3) adsorbent was prepared by simple adsorption of AuNPs on the surface of the activated Al2O3, and was applied in the enrichment of the dissolved total mercury in the environmental water samples. The prepared adsorbent could adsorb both inorganic and organic mercury, and organic mercury could be transformed into element mercury under the catalytic effect of AuNPs. In our experiment, the factors influencing the enrichment and determination of total mercury were investigated, such as pH of the samples, the type and volume of the eluent, the time of the enrichment, and the effect of coexisting ions. Under the optimized condition, the limit of detection (LOD) of total mercury was 0.3 ng·L^-1 based on 400 mL samples, with a linear range of 1.0-40 ng·L^-1 and correlation coefficient of 0.998. The results showed that the method proposed in this work could be applied in the enrichment and determination of the dissolved total mercury in the natural water such as surface water and seawater for routine use.

关 键 词：纳米金颗粒 氧化铝 富集 固相萃取 总汞 原子荧光光谱 

分 类 号：TB33[一般工业技术—材料科学与工程] X832[环境科学与工程—环境工程]