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首页> 外文期刊>RSC Advances >Simultaneous trapping of Zn and Cd by a tungsten coil and its application to grain analysis using electrothermal inductively coupled plasma mass spectrometry
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Simultaneous trapping of Zn and Cd by a tungsten coil and its application to grain analysis using electrothermal inductively coupled plasma mass spectrometry

机译：通过电热电感耦合等离子体质谱法同时捕获钨卷及其在晶粒分析中的应用

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摘要

For the first time, a tungsten coil (TC) was employed to trap Zn and Cd at room temperature and release them simultaneously by heating. In this study, using porous carbon as a vaporizer and a tungsten coil as a Zn and Cd trap, a novel method of solid sampling electrothermal vaporization (SS-ETV) coupled with inductively coupled plasma mass spectrometry (ICP-MS) was developed for the direct detection of Zn and Cd in grain samples. The optimal ashing, vaporization, and releasing conditions as well as the flow rate of the 4% H-2 (v/v) and Ar mixture as the extra and carrier gases were investigated. Under the optimized conditions, the detection limits (LOD) were 1 pg for Zn and 0.1 pg for Cd; the relative standard deviations (RSD) of 11 repeated measurements were 4.7% for Zn and 7.9% for Cd using 2 mg of rice powder samples; the spiked recoveries ranged from 88% to 113%. The concentrations of Zn and Cd in wheat, corn and rice samples measured by the established method were all found to be in the range of the certified values of reference materials. Furthermore, it was proven that the vaporized and trapped species of Zn and Cd were almost atoms by atomic fluorescence spectrometry (AFS) and X-ray photoelectron spectrometry (XPS).
机译：首次，使用钨线圈（Tc）在室温下捕获Zn和Cd并通过加热同时释放它们。在本研究中，使用多孔碳作为蒸发器和钨线圈作为Zn和Cd阱，为耦合电感耦合等离子体质谱（ICP-MS）的实心采样电热蒸发（SS-ETV）的新方法直接检测谷物样品中的Zn和Cd。研究了优化的灰化，蒸发和释放条件以及4％H-2（v / v）和ar混合物作为额外和载气的流速。在优化条件下，检测限（LOD）为Zn和0.1pg的1 pg。使用2mg米粉样品，Zn的11重复测量的相对标准偏差（RSD）为4.7％，CD为4.9％;尖刺的回收率范围为88％至113％。通过所建立的方法测量的小麦，玉米和水稻样品中Zn和Cd的浓度均发现在参考材料的认证值的范围内。此外，证明Zn和Cd的蒸发和被捕获的物种通过原子荧光光谱法（AFS）和X射线光电子光谱法（XPS）几乎是原子。

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  • 来源
    《RSC Advances》 |2016年第54期|共9页
  • 作者

    Mao Xuefei; Zhang Ying; Liu Jixin; Wang Min; Qian Yongzhong; Zhang Zhiwei; Qi Yuehan; Gao Chengling;

  • 作者单位

    Chinese Acad Agr Sci Inst Qual Stand &

    Testing Technol Agroprod Key Lab Agrofood Safety &

    Qual Minist Agr Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Inst Qual Stand &

    Testing Technol Agroprod Key Lab Agrofood Safety &

    Qual Minist Agr Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Inst Qual Stand &

    Testing Technol Agroprod Key Lab Agrofood Safety &

    Qual Minist Agr Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Inst Qual Stand &

    Testing Technol Agroprod Key Lab Agrofood Safety &

    Qual Minist Agr Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Inst Qual Stand &

    Testing Technol Agroprod Key Lab Agrofood Safety &

    Qual Minist Agr Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Inst Qual Stand &

    Testing Technol Agroprod Key Lab Agrofood Safety &

    Qual Minist Agr Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Inst Qual Stand &

    Testing Technol Agroprod Key Lab Agrofood Safety &

    Qual Minist Agr Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Inst Qual Stand &

    Testing Technol Agroprod Key Lab Agrofood Safety &

    Qual Minist Agr Beijing 100081 Peoples R China;

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