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首页> 美国卫生研究院文献>The Scientific World Journal >Determination of Interesting Toxicological Elements in PM2.5 by Neutron and Photon Activation Analysis
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Determination of Interesting Toxicological Elements in PM2.5 by Neutron and Photon Activation Analysis

机译：中子和光子活化分析测定PM2.5中有趣的毒理学元素

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Human activities introduce compounds increasing levels of many dangerous species for environment and population. In this way, trace elements in airborne particulate have a preeminent position due to toxic element presence affecting the biological systems. The main problem is the analytical determination of such species at ultratrace levels: a very specific methodology is necessary with regard to the accuracy and precision and contamination problems. Instrumental Neutron Activation Analysis and Instrumental Photon Activation Analysis assure these requirements. A retrospective element analysis in airborne particulate collected in the last 4 decades has been carried out for studying their trend. The samples were collected in urban location in order to determine only effects due to global aerosol circulation; semiannual samples have been used to characterize the summer/winter behavior of natural and artificial origin. The levels of natural origin element are higher than those in other countries owing to geological and meteorological factors peculiar to Central Italy. The levels of artificial elements are sometimes less than those in other countries, suggesting a less polluted general situation for Central Italy. However, for a few elements (e.g., Pb) the levels measured are only slight lower than those proposed as air ambient standard.
机译：人类活动引入的化合物增加了对环境和人口的许多危险物种的水平。这样，由于影响生物系统的有毒元素的存在，空气中微粒中的微量元素占据了主导地位。主要问题是在超痕量水平下对此类物质的分析测定：就准确性，精密度和污染问题而言，非常特殊的方法是必要的。仪器中子活化分析和仪器光子活化分析确保了这些要求。对过去4年中收集的空气中颗粒物进行了回顾性元素分析，以研究其趋势。为了确定仅由于全球气溶胶循环而产生的影响，在城市地点收集了样本。每半年使用一次样本来表征自然和人工来源的夏季/冬季行为。由于意大利中部特有的地质和气象因素，自然起源元素的含量高于其他国家。人造元素的含量有时低于其他国家，这表明意大利中部的总体污染较小。但是，对于一些元素（例如Pb），所测得的水平仅略低于提议的空气环境标准。

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