共查询到20条相似文献,搜索用时 62 毫秒
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采用ICP-AES法直接同时测定水中二十种金属元素,优化了仪器条件,测定了方法检出限,回收率为90% ̄110%,相对标准偏差<5%,方法准确、可靠、快速。 相似文献
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采用硝酸-氢氟酸-高氯酸将石化工业中常用的难溶废钴钼催化剂快速溶解并利用ICPOES分析法准确测定试样中关键助剂元素锌,考察了不同溶样方法、溶样酸的类别、仪器分析参数对精密度和加标回收率的影响。试验结果表明:相对于灼烧再酸化的溶样方法,直接采用硝酸-氢氟酸-高氯酸溶解试样效果更优,锌的相对标准偏差为2.02%,加标回收率为98%~102%。该分析方法简便易操作,适合大批量的检测分析工作,为石化工业水煤气变换反应中钴钼催化剂的后续工艺研究提供了参考,同时对金属锌的回收循环利用具有重要作用。 相似文献
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用碱熔法熔解样品 ,向标准系列中加入同样量的混合溶剂空白 ,建立工作曲线 ,试样经酸处理后即可直接用ICP -AES法测定陶瓷中Fe、Al、Ca、Mg、Ti、Zr,并与化学法结果一致 相似文献
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建立了不经分离用电感耦合等离子体发射光谱(ICP—AES)直接测定钨铁中钼的方法。样品经过硝酸-盐酸-氢氟酸混合酸溶解后于优化选定的仪器条件下在202.031nm处直接测定,结果与化学法有很好的吻合,相对标准偏差(RSD)小于0.06%,使用本方法的测定结果令人满意,相对于复杂的化学分析方法,该法操作简便、分析快速、结果准确可靠。 相似文献
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Abd El-Ghany A. El Kolali Gamal Gad 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1971,21(12):343-346
The accurate quantitative determination of free quartz contained in local feldspars and clays was achieved through special methods of differential thermal analysis, and chemical analysis. and chemical analysis. Aswan feldspar and Aswan clays were found to contain varying free quartz contents and were therefore considered as suitable sources of raw materials for the preparation of clay-feldspar-quartz ceramic body mixes. Accordingly, no quartz addition was necessary for the production of pottery and porcelain ceramic bodies. 相似文献
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粉尘中游离二氧化硅含量测定过程的质量控制 总被引:1,自引:0,他引:1
分析了目前工作场所粉尘中游离二氧化硅含量的检测方法,对焦磷酸法各个控制要点和控制方法进行了探讨。结果表明,焦磷酸法分析粉尘中游离二氧化硅含量是目前采用的易操作且科学可行的检测方法。但该法存在过程控制复杂、严格,影响数据准确性的因素多,数据不准确等问题,直接影响粉尘检测结果合格与否的判定。认为应加强分析过程的质量控制,降低各个分析过程的误差,保证结果的科学和准确。 相似文献
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We investigated the kinetics of supercritical CO2 (SCCO2)-based drying of silica aerogels, a common, but time consuming and energy intensive step in their manufacture. An apparatus was developed to continuously measure alcohol extraction rates from alcogels as a function of key process variables by two redundant techniques. Kinetics data are reported for the drying of 2.5 mm, 5 mm, and 7.5 mm thick annular alcogels by pumping SCCO2 through a 10 mm-thick concentric annulus surrounding their exterior. The SCCO2 was at a temperature of 323 K and a pressure of 12.4 MPa and its mass flow rate varied from 1 kg/h to 5 kg/h. Gel thickness and SCCO2 flow rate were both shown to significantly effect drying rate and required drying time. The results of a conjugate mass transfer model assuming pure diffusion in the alcogel compared favorably with the data when the composition dependence of molecular diffusivity was captured utilizing available correlations. 相似文献
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以碱熔分解样品,采用HgNO3作滴定剂,KCNS作指示剂测定高岭土中铁,在滴定铁后的溶液中,以锌盐作滴定剂,5-Br-PADAP作指示剂测定高岭土中铝,实现了高岭土中铝铁含量的连续测定,RSD均小于3%,测定值与国标法测定值比较,结果吻合. 相似文献