CAJ | 학술논문

本研究发展了一种ICP-MS同位素气溶胶加入法.可实时标定仪器灵敏度,对气溶胶粒子进行在线定量分析.介绍了同位索气溶胶加入法的原理和参数测量方法,并应用该方法对人工发生的天然铀单粒子中的铀总量进行在线分析,考察方法的可行性.实验结果表明,该方法测得的单粒子中~(238)U原子数的精度为5.6%,比气溶胶发生器给出的计算结果偏大19%,讨论了偏差的可能主要来源.
본연구발전료일충ICP-MS동위소기용효가입법.가실시표정의기령민도,대기용효입자진행재선정량분석.개소료동위색기용효가입법적원리화삼수측량방법,병응용해방법대인공발생적천연유단입자중적유총량진행재선분석,고찰방법적가행성.실험결과표명,해방법측득적단입자중~(238)U원자수적정도위5.6%,비기용효발생기급출적계산결과편대19%,토론료편차적가능주요래원.
In order to calibrate the instrument in real-time for on-line quantitative analy-sis of airborne particles with ICP-MS, an isotopic aerosol particle addition calibration method was developed in our laboratory. In this paper, the method was introduced in detail and validated using artificially generated particle containing uranium. First, aero-sol generation efficiency and solution uptake rate of nebulization sample introduction system were determined accurately through experiments. Natural uranium standard solution was prepared for generation of micron-size and monodisperse particle by a com-mercial Vibrating Orifice Aerosol Generator (VOAG). Isotope was selected to overcome the mass discrimination effect, ~(233)U standard solution was prepared for nebulization of ~(233)U containing particles. The discrete ~(23)U containing particle and continuous ~(233)U con-taining droplets were mixed together, desolvated in a membrane dryer, and introduced into ICP-MS for on-line analysis. Peak-jump mode was used to monitor~(233)U ion intensi-ty and ~(23)U ion count. Instrument sensitivity for ~(233)U was calibrated in real-time. After mass discrimination correction, atom number of ~(23)U in individual particle was deter-mined. Results show precision of measured ~(23)U atom number in individual particle is 5.6 %. The discrepancy with the calculated value based on VOAG operation parameters is 19% and the possible reasons were discussed preliminarily.