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首页> 外文期刊>RSC Advances >Thiol-functionalized silica microspheres for online preconcentration and determination of mercury species in seawater by high performance liquid chromatography and inductively coupled plasma mass spectrometry
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Thiol-functionalized silica microspheres for online preconcentration and determination of mercury species in seawater by high performance liquid chromatography and inductively coupled plasma mass spectrometry

机译：高效液相色谱和电感耦合等离子体质谱，硫醇官能化二氧化硅微球和海水中汞种类的测定

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摘要

Thiol-functionalized silica microspheres (SH-SiO2) were prepared from aminosilica by usage of 3-mercaptopropionic acid for online mercury preconcentration. The adsorbent offered adsorption capacities of 27.4 mg g(-1) for Hg2+, 62.1 mg g(-1) for MeHg and 59.6 mg g(-1) for EtHg. The enrichment could be directly performed without any column preconditioning, where commonly coexisting ions in seawater and sample pH (1.0-9.0) as well as the sampling flow rate caused no significant adverse effects. The adsorbed Hg-analytes (Hg2+, MeHg and EtHg) could be readily eluted (less than 20 s) from the surface of SH-SiO2 with 60 mu L of 100 mM L-cysteine (Cys) + 0.1 M HCl. Hence the enrichment factors of 830 for Hg2+, 916 for MeHg and 883 for EtHg were obtained using 5 mL sample in a 35 s enrichment procedure. The detection limits for Hg2+, MeHg and EtHg were 0.019, 0.013 and 0.014 ng L-1, respectively, and the relative standard deviations of peak height and peak area were all below 4% for 5 ng L-1. Mercury speciation in ten seawater samples was then analyzed by the proposed method, giving rise to satisfactory spiking recoveries (90-102%).
机译：巯基官能化的二氧化硅微球（SH-二氧化硅）通过在线汞富集的3-巯基丙酸用量从aminosilica制备。甲基汞和59.6毫克克（-1）EtHg 27.4毫克克（-1）Hg2 +离子，62.1毫克克（-1）的吸附剂提供吸附容量。富集可以在没有任何预处理柱，其中在海水中和样品的pH值（1.0-9.0），以及所述取样流速通常共存离子没有造成显著不利影响直接执行。所吸附的汞 - 分析物（Hg2 +离子，甲基汞和EtHg）可以由SH-SiO 2的表面用60亩L 100毫摩尔L-半胱氨酸（Cys）+ 0.1M HCl中的可以容易地洗脱（小于20秒）。因此，使用一个35秒富集程序在5mL样品获得用于汞离子，916为甲基汞和883为EtHg 830的富集因子。为汞离子，甲基汞和EtHg的检出限为0.019，0.013和0.014分别纳克L-1，...，和峰高和峰面积的相对标准偏差均在4％以下为5纳克L-1。 10海水样品中汞的形态，然后通过所提出的方法进行分析，从而产生令人满意的尖峰回收率（90-102％）。

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  • 来源
    《RSC Advances》 |2015年第25期|共9页
  • 作者

    Cheng Heyong; Wu Chunling; Liu Jinhua; Xu Zigang;

  • 作者单位

    Hangzhou Normal Univ Coll Mat Chem &

    Chem Engn Hangzhou 310036 Zhejiang Peoples R China;

    Zhejiang Univ Inst Analyt &

    Appl Chem Dept Chem Hangzhou 310027 Zhejiang Peoples R China;

    Hangzhou Normal Univ Coll Mat Chem &

    Chem Engn Hangzhou 310036 Zhejiang Peoples R China;

    Zhejiang Univ Inst Analyt &

    Appl Chem Dept Chem Hangzhou 310027 Zhejiang Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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