共查询到19条相似文献,搜索用时 62 毫秒
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全反射X射线荧光光谱仪的研制 总被引:5,自引:0,他引:5
文章报道了由地矿部物化探研究所和成都地矿所联合研制的全反射X射线荧光(TRXRF)分析装置。介绍了全反射原理及装置的结构特点。该样机与常规的X射线光谱仪相比,对12种元素的检出限降低了2-3个数量级。 相似文献
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新的一代顺序式X射线荧光光谱仪飞利浦PW2400型X射线荧光光谱仪 总被引:1,自引:0,他引:1
本文着重介绍了飞利浦PW2400新的X射线荧光光谱仪,它采用了 多种新技术,包括超锐X射线管,直接光学定位传感器,多道分析器及新的窗式软件。 相似文献
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本文介绍用X射线荧光光谱仪分析焦炭中P_2O_5、Al_2O_3、CaO含量的分析方法,该法分析速度快,结果准确。 相似文献
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新一代顺序式X射线荧光光谱仪——飞利浦PW2400型X射线荧光光谱仪 总被引:2,自引:0,他引:2
介绍了飞利浦PW2400型新的X射线荧光光谱仪,它采用了多种新技术,包括脱X射线管(SST),直读光学定位传感器(DOPS)多道分析器(MCA)及新的窗式软件。 相似文献
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本文在简要介绍X射线荧光能谱分析技术的基础上,以ThermoFisher公司生产的QUANT’X射线荧光能谱仪为例,介绍其在油液分析中的应用研究,并与原子发射光谱进行比较,分析X射线荧光能谱分析技术在应用于油液分析中的优势和不足,并提出相应的解决办法。 相似文献
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3080X射线荧光光谱仪实时数据处理系统1应志春邓赛文甘露吴晓军梁国立罗立强地矿部岩矿测试技术研究所北京10003780年代初、中期陆续引进的3080X射线荧光光谱仪,其拥有量和应用领域在国内首屈一指,它反映了当时的科学技术水平。近十年来,计算机、信... 相似文献
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能量色散X射线荧光光谱仪的现状 总被引:4,自引:1,他引:3
能量色散X射线荧光光谱分析以其快速、对试样无损、可以同时测定多种元素等优点,在许多领域中发挥巨大的作用。本文介绍能量色散X射线荧光光谱仪的原理和构造,并就目前仪器的研究现状和应用现状做介绍,指出X射线荧光分析技术的良好前景及进一步研究该仪器的必要性。 相似文献
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PW1410X射线荧光光谱仪的改造与应用 总被引:1,自引:0,他引:1
对荷兰飞利浦公司生产的PW1410X射线荧光光谱仪进行了改进,研制了专用的定性、定量分析接口板,将它们与IBM-PC计算机样联;编制了通用的X射线荧光光谱定性和定量分析软件,使原先非自动化的仪器改造成可用IBM-PC机进行分析数据自动化处理的更新仪器。 相似文献
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Silvana Moreira Maria Ficaris Ana Elisa S. Vives Virgílio F. Nascimento Filho Orghêda L. A. D. Zucchi Regina C. Barroso 《仪器科学与技术》2013,41(5):567-585
Abstract The environmental pollution problem has increased due to industrial and population growth. São Paulo and Campinas are examples of large urban centers that have grown in a disorderly manner and, today, present contamination problems which have also reached the groundwater. In order to obtain information about levels of heavy metals in groundwater, analyses were carried out with samples from well monitoring at Landfill Pirelli in Campinas and in some supplying wells in the Campinas region which are, in their majority, wells of industrial supply. The analytical technique used for achievement of the analysis is total reflection X‐ray fluorescence with synchrotron radiation. All measurements were performed at Synchrotron Light Source Laboratory, located in Campinas, São Paulo, Brazil. The determined elements in this research were Al, Fe, Mn, Cu, Cr, Ni, Zn, Ba, and Pb. The results were compared with the maximum permitted values (MPV) established by the Brazilian Health Department and, for Landfill Pirelli, the concentrations were higher than the permitted values for Ba and Pb, as was expected, because this landfill received residues during many years without control. In well supply, as in State University of Campinas (UNICAMP), elements such as Cr and Pb were not expected, so the monitoring of these wells is necessary in order to verify if these elements continue to be detected with values above the permitted values. The same elements were also detected in other supplying wells in the Campinas metropolitan region. For lead (Pb), values above the maximum were observed in 15 wells. The detection limits obtained varyied from 0.10 µg · L?1 to 7.91 µg · L?1 and were in agreement with the values presented by other analytical techniques. 相似文献
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Abstract A new design for the construction of an inexpensive and flexible temperature programmer for surface science applications is described. 相似文献
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H. Kohlmüller 《仪器科学与技术》2013,41(3):321-327
SUMMARY Measurement of the limiting diffusion current with fixed diffusion layer is the most suitable of the various methods for determining the fuel concentration in the electrolyte of hydrazine-oxygen fuel cells. 相似文献
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Antonio Carlos Belfort De Carvalho Filho Roberto Pizarro Sanches Airton Abrahão Martin Ana Maria Do Espírito Santo Luís Eduardo Silva Soares 《Microscopy research and technique》2011,74(9):839-844
Background: Dental erosion is a risk factor for dental health, introduced by today's lifestyle. Topical fluoride applications in the form of varnishes and gel may lead to deposition of fluoride on enamel. Purpose: This in vitro study aimed to evaluate the effect of two fluoride varnishes and one fluoride gel on the dissolution of bovine enamel by acids. Methods: Enamel samples (72) were divided (n = 8): artificial saliva (control‐G1), Pepsi Twist® (G2), orange juice (G3), Duraphat® + Pepsi Twist® (G4), Duraphat® + orange juice (G5), Duofluorid® + Pepsi Twist® (G6), Duofluorid® + orange juice (G7), fluoride gel + Pepsi Twist® (G8), and fluoride gel + orange juice (G9). Fluoride gel was applied for 4 min and the varnishes were applied and removed after 6 h. The samples were submitted to six cycles (demineralization: Pepsi Twist® or orange juice, 10 min; remineralization: saliva, 1 h). Samples were analyzed by energy‐dispersive X‐ray fluorescence (144 line‐scanning). Results: The amount of Ca and P decreased significantly in the samples of G2 and G3, and the Ca/P ratio decreased in G3. Mineral gain (Ca) was greater in G9 samples than in G4 > G3 > G5 > G1, and (P) greater in G7 samples than in G9 > G4‐6 > G2‐3. Conclusions: The protective effect of Duofluorid® was significantly lower than fluoride gel against orange juice. The fluoride varnishes can interfere positively with the dissolution of dental enamel in the presence of acidic beverages. Fluoride gel showed the best protection level to extrinsic erosion with low costs. Microsc. Res. Tech., 2011. © 2010 Wiley‐Liss, Inc. 相似文献