高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (1): 26-30.doi: 10.7503/cjcu20150503

• 分析化学 • 上一篇    下一篇

微波等离子体炬-质谱法测定饮用水中微量钙

钟涛1,2, 杨美玲2, 裴妙荣2, 张兴磊2, 乐长高2, 王广才1, 陈焕文2()   

  1. 1. 中国地质大学(北京)水资源与环境学院, 北京 100083
    2. 东华理工大学江西省质谱科学与仪器重点实验室, 南昌330013
  • 收稿日期:2015-06-29 出版日期:2016-01-10 发布日期:2015-12-20
  • 基金资助:
    国家自然科学基金(批准号: 21365002, 21465002)、 国家重大科学仪器设备开发专项(批准号: 2011YQ14015008)和江西省高等学校科技落地计划项目(批准号: KJLD13051)资助

Determination of Trace-amount Calcium in Drinking Water by Microwave Plasma Torch Mass Spectrometry

ZHONG Tao1,2, YANG Meiling2, PEI Miaorong2, ZHANG Xinglei2, LE Zhanggao2, WANG Guangcai1, CHEN Huanwen2,*()   

  1. 1. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China
    2. Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China Institute of Technology, Nanchang 330013, China
  • Received:2015-06-29 Online:2016-01-10 Published:2015-12-20
  • Contact: CHEN Huanwen E-mail:chw8868@gmail.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21365002, 21465002 ), the National Key Scientific Instrument and Equipment Development Projects of China(No.2011YQ14015008) and the Floor Plan of Scientific and Technological Projects in Jiangxi Province, China(No.KJLD13051)

摘要:

以微波等离子体炬(MPT)作为离子源, 廉价离子阱为质量分析器, 建立了用常见有机质谱仪测定饮用水中微量钙的方法. 实验考察了MPT工作气流量、 载气流量等参数对待测元素信号的影响, 并对这些参数进行了优化. 在优化的实验条件下, 采用标准加入法对井水、 自来水及瓶装饮用矿泉水等样品中的微量钙进行了测定. 结果表明, 该方法的检出限(LOD)为3.88 ng/L, 相对标准偏差(RSD)为2.87%~8.04%, 加标回收率(R)为101.3%~115.1%.

关键词: 微波等离子体炬, 离子阱, 质谱, 饮用水,

Abstract:

A method for the determination of trace-amount calcium in drinking water by common organic mass spectroscopy was developed. Meanwhile, microwave plasma torch was introduced as ionization source and low-cost ion trap was introduced as mass analyzer. The operation parameters including flow rates of working gas and carrying gas were studied and optimized. Under the optimal experimental conditions, the micro-amount calcium in well water, tap water and bottled water were determined. In order to minimize the matrix effects in the real samples, the standard addition analysis method was employed. The limit of detection was 3.88 ng/L, and the relative standard deviations(RSD) were 2.87%—8.04%. Recoveries were determined between 101.3% and 115.1%. Experimental results indicated that the novel analytical strategy based on MPT-LTQ-MS for qualitation and quantitation of micro-amount calcium in drinking waters was simple and convenient. And its precision and accuracy meet the demand of determination. Furthermore, compared with ICP-MS, MPT-LTQ-MS was low-cost including instrument and maintenance. The proposed method is a novel and promising strategy for detection of micro-amount calcium in drinking waters.

Key words: Microwave plasma torch, Ion trap, Mass spectroscopy, Drinking water, Calcium

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