气溶胶直接进样装置样品引入流量优化及气溶胶损失率研究

辐射防护 ›› 2021, Vol. 41 ›› Issue (1): 27-32.

气溶胶直接进样装置样品引入流量优化及气溶胶损失率研究

吴昊, 汪传高, 郑国文, 庞洪超, 骆志平, 陈然, 陈凌, 王仲文

中国原子能科学研究院,北京 102413

收稿日期:2020-06-24 出版日期:2021-01-20 发布日期:2021-03-15
通讯作者: 庞洪超。E-mail:ainiphc@163.com
作者简介:吴昊(1988—),男,2010年毕业于南华大学核科学技术学院核工程与技术专业,2016年毕业于南华大学核科学技术学院核科学与技术专业,获硕士学位,现为中国原子能科学研究院辐射防护与环境保护在读博士研究生。E-mail:490022634@qq.com

Study on the optimization of sample introduction flow rate for aerosoldirect injection device and aerosol loss rate

WU Hao, WANG Chuangao, ZHENG Guowen, PANG Hongchao, LUO Zhiping, CHEN Ran, CHEN Ling, WANG Zhongwen

China Institute of Atomic Energy, Beijing 102413

Received:2020-06-24 Online:2021-01-20 Published:2021-03-15

摘要/Abstract

摘要： 由于空气中的氧气会影响电感耦合等离子体质谱(ICP-MS)的测量,空气直接进样测量会导致待测核素的离子化程度降低,从而使灵敏度大大降低甚至于熄火停机。因此为了实现ICP-MS直接对空气气溶胶样品测量,设计了一套气溶胶直接进样装置以实现空气和工作氩气的交换,保证气溶胶由氩气载带进入ICP-MS进行测量。针对该进样装置进行了置换效率测定与分析,通过与ICP-MS联机测量系统本底结果以及整套测量系统的运行成本分析,选择了最优化的空气样品引入流量为0.8 L/min,氩气引入流量为10 L/min。通过气溶胶损失率研究,证明气溶胶经过该直接进样装置时基本无需考虑气溶胶损失的问题。基于气溶胶直接进样装置的研制和性能测试,实现了ICP-MS直接快速测量场所空气中气溶胶,为后续ICP-MS快速定量测量空气气溶胶中的各种长寿命放射性核素奠定了基础,为场所和流出物中气溶胶的快速连续测量提供了一种新的方法。

关键词: ICP-MS, 气溶胶直接进样装置, 样品引入流量, 气溶胶损失率

Abstract: Considering the impact of oxygen in the air on the measurement results of ICP-MS, the air direct injection measurement could lead to the reduction of ionization degree for nuclides to be measured, which may decrease the sensitivity of ICP-MS or even cause an outage. Therefore, in order to measure air aerosol samples by ICP-MS directly, a set of aerosol direct injection device was designed to achieve the exchange between air and working argon, so as to make sure that aerosol can be carried into ICP-MS for measurement by argon. Conversion efficiency of the device was measured and analyzed. Analyzing the system background levels measured by the on-line system of ICP-MS, and estimating the operating costs the whole system, the optimum programme was chosen while the inlet flowrate of air sample was 0.8 L/min, and the inlet flowrate of argon was 10 L/min. According to study on the aerosol loss rate, it is proved that the aerosol loss does not need to be considered when aerosol passes the direct injection device. With the development and performance test of the aerosol direct injection device, air aerosol can be measured directly and fast by ICP-MS, laying a foundation for rapid and quantitative measurement of various long-life radioactive nuclides in air aerosol by ICP-MS in the future, and providing a new method to measure aerosol continuously and rapidly in sites and effluents.

Key words: ICP-MS, aerosol direct injection device, sample introduction flow rate, aerosol loss rate

中图分类号:

TL75+1

吴昊, 汪传高, 郑国文, 庞洪超, 骆志平, 陈然, 陈凌, 王仲文. 气溶胶直接进样装置样品引入流量优化及气溶胶损失率研究[J]. 辐射防护, 2021, 41(1): 27-32.

WU Hao, WANG Chuangao, ZHENG Guowen, PANG Hongchao, LUO Zhiping, CHEN Ran, CHEN Ling, WANG Zhongwen. Study on the optimization of sample introduction flow rate for aerosoldirect injection device and aerosol loss rate[J]. RADIATION PROTECTION, 2021, 41(1): 27-32.

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