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电感耦合等离子体串联质谱法分析凹凸棒黏土中的微量元素
引用本文:李坦平,李爱阳.电感耦合等离子体串联质谱法分析凹凸棒黏土中的微量元素[J].岩矿测试,2021(2):196-205.
作者姓名:李坦平  李爱阳
作者单位:湖南工学院新型建筑材料研究院, 湖南 衡阳 421002
基金项目:国家自然科学基金项目(81603400);湖南省自然科学基金项目(2019JJ60026);湖南省教育厅重点项目(18A428);湖南省应用特色学科材料科学与工程学科资助项目(湘教通[2018]469号);湖南省工程研究中心资助项目(湘发改委高技[2019]853号)
摘    要:凹凸棒黏土是具有层链状结构的含水富镁铝硅酸盐矿物,矿床成因不同导致凹凸棒黏土中微量元素的组成存在差异,其中Be、Cr、Ni、As、Cd、Sb、Hg、Pb会对健康和环境产生不利影响,而V、Mn、Co、Cu、Zn、Mo、Sn、Ba作为凹凸棒黏土的重要微量元素影响其性能和应用范围,因此,对凹凸棒黏土中微量元素进行精准分析可为...

关 键 词:凹凸棒黏土  电感耦合等离子体串联质谱法  微量元素  质谱干扰  反应气
收稿时间:2020/4/9 0:00:00
修稿时间:2020/7/30 0:00:00

Determination of Trace Elements in Attapulgite Clay by Inductively Coupled Plasma-Tandem Mass Spectrometry
LI Tan-ping,LI Ai-yang.Determination of Trace Elements in Attapulgite Clay by Inductively Coupled Plasma-Tandem Mass Spectrometry[J].Rock and Mineral Analysis,2021(2):196-205.
Authors:LI Tan-ping  LI Ai-yang
Institution:Academy of New Building Materials, Hunan Institute of Technology, Hengyang 421002, China
Abstract:BACKGROUND: Attapulgite clay is a water-rich magnesium aluminosilicate mineral with a layered chain structure. The different genesis of the deposit results in a different composition of trace elements in attapulgite clay. Elements Be, Cr, Ni, As, Cd, Sb, Hg, and Pb have adverse effects to health and environment, while V, Mn, Co, Cu, Zn, Mo, Sn and Ba can affect the performance and application of attapulgite clay. Therefore, accurate analysis of trace elements in attapulgite clay can provide a theoretical basis for the high-efficiency value-added deep processing of attapulgite clay. Determination of trace elements in rocks and minerals by inductively coupled plasma-mass spectrometry (ICP-MS) has the characteristics of low limit of detection (LOD) and high sensitivity. Complex spectral interference during the analysis is difficult to completely eliminate, even if collision reaction cell (CRC) technology is used.
OBJECTIVES: To establish an analytical method for the accurate determination of trace elements in attapulgite clay by ICP-MS/MS.
METHODS: In view of the spectral interference in the analysis process, in the MS/MS mode, O2 and NH3/He were added into CRC as reaction gases, and the corresponding oxide ions and cluster ions were generated by mass shift reaction to eliminate the interference. Internal standard elements with similar mass number and similar mass spectrometry behavior were selected to correct the matrix effect and stabilize the analysis signal.
RESULTS: The microwave digestion of attapulgite samples with mixed nitric acid, hydrochloric acid and hydrofluoric acid can not only accelerate the digestion speed of the sample, but also maintain the stability of the analytical elements in the digestion solution. The method was used to determine 16 trace elements in national standard reference material basalt (GBW07105). The relative errors of analytes were -9.60%-8.21%, and the relative standard deviation (RSD) was less than 6.0%. Under the selected analytical conditions, the LOD of analyte was 0.13-51.6ng/L.
CONCLUSIONS: ICP-MS/MS can effectively reduce the interference of mass spectrometry and improve the accuracy and sensitivity of some specific isotopes in complex media. The method is suitable for the rapid determination of trace elements in attapulgite clay.
Keywords:attapulgite clay|inductively coupled plasma-tandem mass spectrometry|trace elements|mass spectral interference|reaction gas
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