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山东省胃癌高低发生地区主要食物中微量元素的PIXE分析 总被引:1,自引:0,他引:1
介绍了用PIXE技术分析食物中微量元素的方法,给出了山东省胃癌高发区栖霞县和低发区苍山县当地产主要食物的微量元素谱。t检验结果显示,栖霞县食物中Sr、Ni、Cu、Mn和Fe的含量显著高于苍山县,而Se的含量则相反。 相似文献
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用PIXE技术分析山东省胃癌高,低发区饮水中的微量元素 总被引:3,自引:0,他引:3
介绍了用PIXE技术分析饮水中微量元素的方法,给出了山东省胃癌高发区栖霞县与低发区苍山县饮水中的微量元素谱。两地饮水中微量元素含量的检验显示,Ti,V,Cu,Fe和Fr等5种元素栖霞均显著高于苍山县。 相似文献
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人发样品中微量元素的XRF分析 总被引:1,自引:0,他引:1
通过化学加入法校正吸收效应,采用X射线荧光分析法(XRF)分析人发样品,确定人发中微量元素的含量。以实际人发样品为基础,求得经基体吸收后的相对效率,拟合出相对效率与基体中重要成分Ca含量的关系式,然后用标定的系数进行人发样品中的Ca、Cu、Fe、Zn含量分析。采用此方法分析了一组人发标准物质,并与国标推荐值进行比较,结果表明测定值与推荐值符合情况良好,与国标相比偏差为Ca0.28%,Fe0.99%,Cu2.6%,Zn0;相对测量误差Ca2.2%,Fe1.7%,Cu2.2%,Zn1.1%,其灵敏度≤2.2%。表明采用XRF分析人发中微量元素含量是可行的。 相似文献
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本文介绍采用长短照射相结合的仪器中子活化分析法,测定了克山病病区、非病区的男性儿童头发中多种微量元素含量。比较了国内常用的及IAEA推荐的清洗方法对头发中微量元素测定的影响。用NBS标准参考物核对了实验中使用的部份标准,结果满意。本工作共分析了48例头发样品中27种元素含量,初步获得了某些元素在三个地区人发中分布的规律。 相似文献
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股骨头松质骨中无机元素的PIXE分析 总被引:4,自引:0,他引:4
使用质子激发X射线荧光分析技术测定了5例正常人和7例股骨颈骨折患者股骨头松质骨中无机元素谱的分布。详细介绍了骨样品处理技术,建立了正确测定骨骼微量元素的定量方法。结果表明在对照组中元素P、Ca、Fe、Cu、Sr的含量高于病变组,统计检验表明有显著意义,而元素S、K、Mn、Zn在两组间无显著差异。对Ca、P、Sr、Cu等无机元素的生理功能进行了初步的讨论。 相似文献
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H. Oudadesse G. Guibert E. Chassot J. L. Irigaray S. Terver G. Vanneuville Y. Tessier T. Sauvage G. Blondiaux 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2002,190(1-4):445-448
Some metallic prostheses inserted in human hip undergo physico-chemical modification, a few years after their implantation. Tissues surrounding these prostheses are damaged by metallic element transfer. Surgeons in Clermont-Ferrand Hospital (France) recover tissues of abnormal coloration that were in contact with metallic implants. PIXE technique (particles induced X-ray emission) with a 400 μm proton beam and 3 MeV of energy is an efficient technique to analyze these tissues and to detect elements, which are transferred from prosthesis to tissues. PIXE analyses were carried at the CERI-CNRS Laboratory. We have applied this method to determine qualitatively and quantitatively trace elements migration from metallic implants to surrounding tissues and organs, like kidney, spleen, liver, lymphatic gland and lung. 相似文献
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质子激发X荧光法测定西太平洋海域雨水的微量元素组成 总被引:2,自引:0,他引:2
用质子激发X荧光分析法测定了西太平洋海域海面上雨水中微量元素的组成和浓度,并通过富集因子的计算,表明海面上雨水中的地壳元素和污染元素主要来自陆地长距离输送的尘土粒子及人为排放污染物。 相似文献
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Trace elements in lake sediments measured by the PIXE technique 总被引:1,自引:0,他引:1
Luciana V. Gatti Antnio A. Mozeto Paulo Artaxo 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1999,150(1-4):298-305
Lakes are ecosystems where there is a great potential of metal accumulation in sediments due to their depositional characteristics. Total concentration of trace elements was measured on a 50 cm long sediment core from the Infernão Lake, that is an oxbow lake of the Moji-Guaçu River basin, in the state of São Paulo, Brazil. Dating of the core shows up to 180 yrs old sediment layers. The use of the PIXE technique for elemental analysis avoids the traditional acid digestion procedure common in other techniques. The multielemental characteristic of PIXE allows a simultaneous determination of about 20 elements in the sediment samples, such as, Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Rb, Sr, Zr, Ba, and Pb. Average values for the elemental composition were found to be similar to the bulk crustal composition. The lake flooding pattern strongly influences the time series of the elemental profiles. Factor analysis of the elemental variability shows five factors. Two of the factors represent the mineralogical matrix, and others represent the organic component, a factor with lead, and another loaded with chromium. The mineralogical component consists of elements such as, Fe, Al, V, Ti, Mn, Ni, K, Zr, Sr, Cu and Zn. The variability of Si is explained by two distinct factors, because it is influenced by two different sources, aluminum-silicates and quartz, and the effect of inundation are different for each other. The organic matter is strongly associated with calcium, and also bounded with S, Zn, Cu and P. Lead and chromium appears as separated factors, although it is not clear the evidences for their anthropogenic origin. The techniques developed for sample preparation and PIXE analysis was proven as advantageous and provided very good reproducibility and accuracy. 相似文献
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用质子X荧光分析法(PIXE)分析了15只小白鼠的S180纤维肉瘤和正常组织中15种元素含量,采用自身对照形式研究痕量元素变化,以消除生物个体的差异。另取健康小鼠作空白,数据作统计分析,结果发现Fe、Zn、As和Cu/Zn以及多种元素比值有明显的差异,并讨论了这些元素与肿瘤的关系。 相似文献
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N. Sato K. Kuroda M. Suzuki A. Ogawa K. Sera 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1999,150(1-4):214-217
Various causal factors have been proposed for cerebral vasospasm after subarachnoid hemorrhage (SAH), such as serotonin, acetylcholine, angiotensin, thrombin and thromboxane A2. However, none of them explain the whole pathomechanism of vasospasm. To evaluate the role of trace elements on vasospasm, we have examined these sequential changes in the cerebrospinal fluid (CSF) after SAH by PIXE, and have investigated the relation between trace elements and vasospasm. We obtained the CSF samples from cisternal drainage in patients with SAH who underwent radical surgery within 48 h from the onset. The drainage was placed into basal cisterns at the end of the operation. Three sampling times (3–5, 7–9 and 12–14 days from the onset) has been scheduled because vasospasm is likely to occur from day 4 to day 14 after the onset. In this study, we focused on the levels of Mg, Ca, Mn, Al, Zn, P, Pb, Sr, Br, Co, Cu, Si, Ti, Mn,Co, Cu, Zn, Br, Sr, Mo and Pb, and we found a significantly lower level of Mg in the CSF of patients with vasospasm on days 7–9 after the onset. These results suggest that Mg in the CSF may ameliorate vasoconstriction due to Ca in the pathomechanism of vasospasm. 相似文献