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IF 3.9 3区环境科学与生态学 Q2 ENGINEERING, CHEMICAL

Journal of Aerosol Science Pub Date : 2024-09-13 DOI:10.1016/j.jaerosci.2024.106469

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引用次数: 0

摘要

接触空气中的微小气溶胶会因吸入阿尔法发射体（如 222Rn 子体）而影响健康。铅 210 和铅 210Po 主要与中值空气动力学直径小于 1 μm 的气溶胶有关。210Po 的特点是具有高辐射毒性。由于 210Pb 对地表空气气溶胶中的 210Po 浓度有很大影响，因此精确测量地表空气气溶胶中的 210Po 通常相当复杂。此外，目前还没有可能制造出认证材料来验证地表空气气溶胶中 210Pb 和 210Po 浓度的测量结果。因此，本研究旨在开发一种新颖而全面的方法，通过在实验室中制备已知 210Pb 和 210Po 活性的 "标准样品 "来验证地表空气气溶胶中 210Po 的测量结果。针对采样时间、采样开始与 210Po 自沉积之间的时间间隔以及地表空气气溶胶中 210Po/210Pb 活性比等相关变量，对 210Po 浓度测量精度进行了详细的敏感性分析。这项研究对于找到精确测量地表空气气溶胶中 210Po 的最佳条件十分必要。此外，该方法还被用于测定 2022 年 3 月 25 日至 7 月 15 日在埃尔卡门校园（韦尔瓦省）进行的 30 次大气气溶胶采样活动中的 210Po 浓度。关于 210Pb 和 210Po 浓度以及大气气溶胶停留时间（通过 210Po/210Pb 活性比）的研究结果与之前的其他研究结果一致。

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A new procedure to validate and optimize 210Po measurements in atmospheric aerosols

The exposure to air fine aerosols can cause health effects due to inhalations of alpha emitters such as ²²²Rn daughters. Lead-210 and ²¹⁰Po are mainly associated to aerosols with median aerodynamic diameter lower than 1 μm. The ²¹⁰Po is characterized by having a high radiotoxicity. The precise measurement of ²¹⁰Po in surface air aerosols is usually quite complex due to the significant contribution of the ²¹⁰Pb on their concentrations. Additionally, there is no possible means to manufacture a certified material to validate the measurements of ²¹⁰Pb and ²¹⁰Po concentrations in surface air aerosols. For these reasons, this study aims to develop a novel and comprehensive methodology to validate ²¹⁰Po measurements in surface air aerosols by preparing in our laboratory “standard samples” with known activities of both ²¹⁰Pb and ²¹⁰Po. A detailed sensitivity analysis on the precision of ²¹⁰Po concentration measurements has been carried out as a function of the involved variables such as sampling time, time elapsed between the sampling start and ²¹⁰Po self-deposition and the ²¹⁰Po/²¹⁰Pb activity ratio in surface air aerosols. This study is necessary to find the optimum conditions for a precise measurement of ²¹⁰Po in surface air aerosols. In addition, this methodology has been applied for the determination of ²¹⁰Po concentrations in 30 samplings campaigns of atmospheric aerosols carried out at the El Carmen campus (Huelva province) from March 25th to July 15th, 2022. The results obtained for ²¹⁰Pb and ²¹⁰Po concentrations and atmospheric aerosol residence times (via ²¹⁰Po/²¹⁰Pb activity ratio) were consistent with other previous works.

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来源期刊

Journal of Aerosol Science 环境科学-工程：化工

CiteScore

8.80

自引率

8.90%

发文量

127

审稿时长

35 days

期刊介绍： Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences. The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics: 1. Fundamental Aerosol Science. 2. Applied Aerosol Science. 3. Instrumentation & Measurement Methods.