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本文提出了用ICP-AES法直接同时测定高纯氧化钇中14个稀土和16个非稀土杂质元素的分析方法,对被测元素的 谱线、氧化钇基本及背景影响进行了研究,用标准加入法测出氧化钇基准中的微量杂质元素,消除了由于忽略基准中的杂质元素含量给高纯氧化钇分析测定带来的误差,同时对工作条件进行了优化。方法中各被测元素的检出限为0.003~1.31ug/g,能够满足生产过程中的质量控制及进出口商品检验 相似文献
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The predictive quality of the current drainage class map of Flanders was evaluated using data from two monitoring networks: one with good spatial coverage but poor temporal coverage and another with better temporal but poor spatial coverage. We combine both networks to obtain 1678 point predictions for mean highest water (MHW) and mean lowest water (MLW) tables by applying time series modelling and total least squares regression. The resulting MHW and MLW point data set was used to evaluate the currency of the existing map and to identify regional differences. The quality of the current map is moderate, and large differences occur between regions. Especially the Campine region shows large and systematic differences, whereas the southeastern hills and chalk–loam region is relatively accurate. If more weight is given to errors in the wetter drainage classes, about 50% of the area of Flanders would benefit from remapping. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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以天然粉石英为基本原料,通过氢氟酸与盐酸混合酸溶蚀技术和机械强力搅拌处理,制备了高纯球形-准球形亚微米晶质SiO2材料。XRD,SEM表征结果表明,制备的高纯球形亚微米晶质SiO2材料为纯结晶SiO2相,粒子呈球形-准球形,球化-准球化率达80%~90%,粒径一般为300 nm~800 nm;其化学组成为:w(SiO2)99.90%,w(Al2O3)192×10-6,w(Fe2O3)33×10-6,w(Mg)1×10-6,w(Ca)2×10-6,w(Cl-)20×10-6。 相似文献
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This study presents an evaluation of Brazilian quartz deposits of Corinto and Olhos D'água, in Minas Gerais State, as potential high purity raw material for the production of silica glass. Both deposits are part of the Serra de Santa Helena formation, which holds other quartz deposits. Several quartz samples from these mines were analyzed to evaluate their chemical purity, by determination of the content of trace elements by ICP-MS after acid digestion. The technological characteristics of the ores after flame-fusion into silica glass were evaluated according to their bubble generation and UV transparency. The results indicate that silica glass with chemistry suitable for crucible applications can be obtained from materials of both mines, and even optical grade silica glass can be manufactured using transparent ore from one of the mines. In addition, this work explores the trace elements composition of each mine, as well as their fluid inclusions, and characterizes the mines as being of hydrothermal origin. Small differences in the physical and chemical characteristics of quartz that could affect the technological behavior of the ores are related to the geological history of the mines and provide interesting insights regarding the exploration of other quartz resources within the same geological formation. 相似文献
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正1 Introduction Crystallization is one of important unit operations in the chemical production process,which requires not only the crystal product with high purity and yield,but also the available particle size of the crystal products to ensure product quality.Crystallization process is affected by 相似文献
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