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首页> 外文期刊>International journal of PIXE >PIXE ANALYSIS OF BIOLOGICAL SAMPLES FOR ASSESSING AIRBORNE ELEMENTS AT GROUND LEVEL
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PIXE ANALYSIS OF BIOLOGICAL SAMPLES FOR ASSESSING AIRBORNE ELEMENTS AT GROUND LEVEL

机译：用于评估地面空气中元素含量的生物样本的像素分析

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Biological monitoring through higher plants should be more than just a second choice for air-quality assessment in polluted or dry areas that happen to be devoid of lichens and/or bryophytes. Provided that some of their specifics are accounted for, vascular plants could indeed stand for an actual alternative to lower epiphytes, if not featuring some real advantages – technical, economical and ecological – over them. As a contribution to an evaluation of such an alternative, olive trees (Olea europaea Linn.) have been sampled for their outer bark across two separate areas of mainland Portugal, in a total of 53 collection locations. After suitable procedures, bark samples were put through proton-induced X-ray emission (PIXE) and analyzed for their elemental contents. Nonparametric coefficients (Kendall's) for the spatial variation of S, Ni, Cu and Pb are significant beyond any reasonable, statistical level. There is also a good spatial agreement – sometimes, an excellent one – with lichen trends as an external reference, but for lead, that may suffer from spectral interference though. Further research on material cleansing and pelletising procedures is advisable, especially in what concerns the homogeneity of bark samples for PIXE analysis.
机译：对于在恰好没有地衣和/或苔藓植物的污染或干燥地区进行空气质量评估，通过高等植物进行的生物监测应不仅仅是第二种选择。如果考虑到其中的某些特定特征，维管植物确实可以代替低附生植物，即使它们不具有某些真正的优势（技术，经济和生态方面的优势），它们也确实可以代表。为了评估这种替代方法，已在葡萄牙大陆的两个单独区域内的总共53个采集地点对橄榄树（橄榄树）的外皮进行了采样。经过适当的程序后，将树皮样品进行质子诱导的X射线发射（PIXE），并分析其元素含量。 S，Ni，Cu和Pb的空间变化的非参数系数（Kendall's）超出了任何合理的统计水平。还有一个很好的空间协议-有时是一个很好的协议-以地衣趋势作为外部参考，但对于铅，可能会受到光谱干扰。建议对材料清洁和造粒程序进行进一步研究，尤其是在有关树皮样品的均质性以进行PIXE分析方面。

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