Preliminary study on aerosol particle addition calibration method for on-line quantitative analysis of airborne radioactive particles with ICP-MS
Preliminary study on aerosol particle addition calibration method for on-line quantitative analysis of airborne radioactive particles with ICP-MS
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DOI：
10.1080/03067310903094529
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发表时间：
2011-03
影响因子：
2.6
通讯作者：
Yongyang Su;Zhi Ming Li;H.-B. Dong;Guo-Qing Zhou;Li-hua Zhai;Jiang Xu;N. Huang;Shi Zeng;F. Zhu
中科院分区：
文献类型：
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作者：
Yongyang Su;Zhi Ming Li;H.-B. Dong;Guo-Qing Zhou;Li-hua Zhai;Jiang Xu;N. Huang;Shi Zeng;F. Zhu
目前正在开发与电感耦合等离子体质谱仪相结合的环境气溶胶浓缩系统，用于实时监测空气中的放射性颗粒。由于电感耦合等离子体质谱对进样条件非常敏感，因此在现场应用中有必要建立一种简单易用的在线定量分析校正方法。本文建立了用标准溶液代替单分散颗粒的校正方法，并进行了初步验证。首先，实验确定了该方法的四个参数，包括：微同心雾化器的吸收流量和雾化效率，Aridus解溶进样系统的雾化/传输效率，以及159Tb和174Yb之间的相对灵敏度因子。然后，用商用振动孔气溶胶发生器产生单分散的硝酸铽颗粒。从标准溶液中雾化连续的硝酸Yb气雾剂。将它们混合在一起，通过膜干燥器解溶，然后引入电感耦合等离子体质谱(ICP-MS)在线分析硝酸铽颗粒。将从核环境中采集的空气引入电感耦合等离子体质谱仪，考察了流速对仪器响应的影响。最后，用定标方法测定了离散硝酸铽粒子中159Tb的原子数，并与计算值进行了比较。结果表明，当空气流量从10mLmin−1增加到100mLmin−1时，虽然仪器灵敏度降低了25倍，但159Tb离子计数与174Yb离子强度的比值保持不变。测量159Tb原子数的相对标准偏差优于18%。与计算值的差异可以归因于VOAG产生的粒子中的原子数被高估了，因为VOAG中存在一些液体泄漏。
An ambient aerosol concentration enrichment system coupled with ICP-MS for real-time monitoring of airborne radioactive particles is now under development. ICP-MS is very sensitive to sample introduction conditions, so it is necessary to develop an easy-use calibration method for on-line quantitative analysis in field application. In this paper, a calibration method using standard solution instead of monodisperse particles was established and validated preliminarily. First of all, four parameters for the method were determined experimentally, including: uptake flow rate and nebulisation efficiency of the Microconcentric nebuliser, nebulisation/transport efficiency of Aridus Desolvating Sample Introduction System, and Relative Sensitivity Factor between 159 Tb and 174 Yb. Then, monodisperse terbium nitrate particles were generated by a commercial Vibrating Orifice Aerosol Generator. Continuous aerosols of ytterbium nitrate droplets were nebulised from standard solution. They were mixed together, desolvated through the membrane dryer and introduced into ICP-MS for on-line analysis of terbium nitrate particles. The air sampled from nuclear environment was also introduced into ICP-MS to investigate the effect of flow rate on instrument responses. Finally, atom numbers of 159 Tb in discrete terbium nitrate particles were determined using the calibration method and compared to the calculated value. Results show that when air flow rate increase from 10 mL min−1 to 100 mL min−1, the ratio of 159 Tb ion count to 174 Yb ion intensity keeps constant although instrument sensitivity decreases by a factor of 25. The relative standard deviation of 159 Tb atom number measured is better than 18%. The discrepancy with the calculated value could be attributed to the over-estimation of atom number in the particles generated by VOAG because there was some liquid leakage in the VOAG.