单波长色散X射线荧光光谱法测定重整催化剂氯含量

重整催化剂氯含量分析多采用电位滴定法,该方法需用化学试剂对样品进行前处理,分析过程繁琐,测定时间长。创建了重整催化剂氯含量分析新方法——单波长色散X射线荧光光谱法,考察了方法的准确性、重复性,分析了方法的影响因素。结果表明：该方法测定重整催化剂的氯含量具有很好的准确性和重复性,能够满足生产测定要求,仪器自动化程度高,操作简单快速,测定过程无需任何化学试剂,是未来分析的发展方向。     

单波长色散X射线荧光光谱法测定油品硫含量方法改进

针对炼化企业控油品硫含量的要求,采用单波长X射线荧光光谱法与氧化微库仑法测总硫进行比对,取得了良好的分析结果。从而得出中控渣油、混合原料油、油浆、蜡油等重质油品总硫分析同样适用《轻质液体燃料中硫含量的测定单波长色散X射线荧光光谱法》(NB/SH/T 0842—2017),将方法中线性范围扩大到1～100 000 mg·kg~(-1),并建立相应企业标准。     

X射线荧光光谱仪及其分析技术的发展

按照获得和分辨特征X射线荧光光谱的方式,X射线荧光光谱仪可以分为波长色散X射线荧光光谱仪（WDXRF）和能量色散X射线荧光光谱仪（EDXRF）两大类。依照这一分类,论述了X射线荧光光谱仪在设备装置和配套方法方面的新状况。X射线荧光光谱仪整机现在向着小型化、智能化、多功能方面发展,仪器各部件也随着研究的深入而得到了更进一步地改进,在这一基础上,仪器可分析元素的含量范围得到了拓展,方法也得到了丰富。目前,X荧光光谱仪开发了微区面分布的元素成像分析方法、高级次谱线分析方法、薄膜分析方法等新的方法,对这些新方法作以介绍,同时也对基本参数法（FP法）的新近发展作了说明。     

单波长色散X射线荧光法测定硫含量

采用单波长色散X射线荧光法测定轻质液体燃料中的硫含量,讨论了标准样品基体的选择、取样操作、装样及窗口膜等主要影响因素,同时提出采用柴油作为质量监控样品检验分析仪器的稳定性和精密度。结果表明:该方法具有分析速度快、结果准确、操作简单的优点,能够满足轻质液体燃料分析的需要。     

波长色散X射线荧光光谱法测定水样中的微量铈

建立了采用波长色散X射线荧光光谱仪测定水样中微量铈的方法。测定结果表明,测量单个样品需100 s,检出限为0.6μg/g。当铈浓度的线性范围为1~1×104μg/g,相对标准偏差不大于1.28%,加标回收率为97.2%~98.6%。该方法快速、准确、环保,不受铈离子价态、水样pH值和共存离子的明显影响。     

Determination of organic sulphur in raw and chemically cleaned coals by scanning electron microscopy and energy dispersive X-ray spectrometry

Scanning electron microscopy-energy dispersive X-ray spectrometry (SEM-EDS) is a useful method to evaluate chemical cleaning processes and to obtain values of the organic sulphur remaining in cleaned coals. Pressed pellets can be used when the cleaning process has made the coal too heterogeneous to analyse by the conventional epoxy mounting method. The SEM-EDS analysis time is the same for both methods, whereas the preparation of pellets is much easier than that of epoxy mounts. The overall analysis time should therefore be decreased by using the pellet technique.     

能量色散型X荧光分析仪在5000t/d生产线上的应用

<正>我厂新建了一条5 000t/d生产线,采用国产WISDOM-6000A能量色散型X荧光分析仪。现介绍其应用情况。1仪器和试剂WISDOM-6000A能量色散型X荧光分析仪;ZM-1振动磨:铬钢磨盘;YYJ-40压片机。     

Data-driven research on chemical features of Jingdezhen and Longquan celadon by energy dispersive X-ray fluorescence

The energy dispersive X-ray fluorescence (EDXRF) is used to determine the chemical composition of celadon body and glaze in Longquan kiln (at Dayao County) and Jingdezhen kiln. Forty typical shards in four cultural eras were selected to investigate the raw materials and firing technology. Random forests, a relatively new statistical technique, has been adopted to identify chemical elements that are strongest explanatory variables to classify samples into different cultural eras and kilns. The results indicated that the contents of Na₂O, Fe₂O₃, TiO₂, SiO₂ and CaO vary in celadon bodies from Longquan and Jingdezhen, which implies that local clay was used to manufacture celadon bodies in Jingdezhen kiln. By comparing the chemical composition in glaze, we find that the chemical elements and firing technology of Jingdezhen kiln are very similar to those in Longquan kiln, especially for Ming dynasty. This study reveals the inheritance between Jingdezhen kiln and Longquan kiln, and explains the differences between two kilns.     

X荧光光谱法测定聚酯过渡料中二氧化硅含量

纤维级聚酯中的添加剂为TiO_2,特性聚酯中的添加剂是SiO_2,由纤维级聚酯转产特性聚酯的过程中过渡料中TiO_2逐渐减小,SiO_2含量逐渐增加,过程控制需要快速测定过渡料中SiO_2含量。本文建立了用X荧光光谱法,将聚酯过渡料样品粉碎后压片,采用外标工作曲线法快速测定特性聚酯过渡料中SiO_2的含量,测定一个样品的时间由原来的灰化法8 h提速至1 h。方法的相对标准偏差为2.8%;标准曲线的线性相关系数为:0.999 5。     

Evaluation of varnish and paint films using digital image processing, energy dispersive X-ray fluorescence spectrometry, and chemometric tools

This article reports an analytical study of modifications occurring on surfaces coated by 17 varnishes and 10 paints. The surface films were submitted to accelerated laboratory tests and atmospheric environmental exposures. Digital image processing, energy dispersive X-ray fluorescence spectrometry (ED-XRF), and principal component analysis (PCA) were applied. Digitalized images were obtained using a conventional scanner and converted into gray color scale histograms. The data were organized into a matri and analyzed with PCA. This method permits the classification of weatherproofing products according to their performance in the tests, avoiding subjective interpretations. ED-XRF spectra combined with PCA were also efficient for evaluating deterioration processes of varnishes and paints, confirming the results from digitized images.     

水泥生料配加萤石控制方式的改造

对水泥生料配加萤石的控制方式作了改造,并简述了其控制原理。改造后水泥熟料中游离 Ｃａ Ｏ 含量降低了３０ ％ ,机窑台时产量增加０５ｔ。     

X射线荧光光谱法分析镁铬耐火材料

采用熔融的方法进行制样,并以标准样品和高纯试剂配制熔融的系列标准玻璃片来建立校准曲线,用X射线荧光光谱法测定镁铬耐火材料中Na、Mg、Al、Si、Cr等11个元素。结果表明:该方法有效地克服了镁铬系列耐火材料存在的矿物效应和颗粒效应,方法简单,快速,准确。当试样中Na2O、MgO、Al2O3、SiO2和Cr2O3的质量分数分别为0.47%、40.00%、8.24%、11.84%和27.07%时,其测定结果的相对标准偏差分别为4.04%、0.25%、0.32%、0.46%和0.24%;本方法的测定值与化学分析法的测定值较一致,能满足常规分析的要求。     

Identification of hydrated cement constituents using a scanning electron microscope energy dispersive X-ray spectrometer combination

Preliminary studies of the chemical composition of individual particles and local areas in hydrated cement pastes were carried out using a scanning electron microscope-energy dispersive x-ray spectrometer combination. Calibration curves prepared from a series of homogeneous cement and hydrated cement compounds were used, the analysis being carried out in terms of ratios of calcium oxide to silicon, sulfur, and aluminum oxides. Sulfur was distributed throughout the calcium silicate hydrate gel, except for regions thought to represent “inner” hydration product. Apparent mole ratios of calcium oxide to silica ranged generally between 2 and 3, considerably higher than had been expected. Various morphological features were interpreted in the light of their chemical compositions.