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提出了用电感耦合等离子体发射光谱法(ICP-AES)测定镍基高温合金中Al、Cu、Mn、Si、Fe、Ti、Mo、Cr、Co等元素含量的方法。通过实验确定了溶样方法、仪器最佳工作参数和分析谱线波长,同时还研究了各元素间的干扰,来达到准确测定的效果。方法经检出限、标准样品测定和准确度、精密度、加标回收率试验,表明该方法准确、可靠、简便、快速。 相似文献
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采用混合酸溶解含镍生铁样品,利用电感耦合等离子体发射光谱仪(ICP-AES)可一次性检测含镍生铁中的P、Si、Mn、Cu、Ni、Cr、Mo、V、Ti、Al、Co、Sn、W、As和Nb等15种元素含量。实验表明该法精密度高、回收率良好,精密度为1.02%~2.78%,回收率为96.2%~104.0%,可以满足实验室高效分析的要求。 相似文献
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镍铁中含有Ni、P、Si、Cu等多元素杂质,传统的单一元素测定法虽然准确可靠,但操作过程复杂。本文采用电感耦合等离子体发射光谱法(ICP-AES)同时测定镍、磷、硅、铜的含量,通过选择合适的仪器测定参数、分析谱线消除共存元素间的干扰。实验结果证明此法相对标准偏差低,测定效果好。 相似文献
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微波消解-ICP-OES法测定黑芝麻中的18种矿质元素 总被引:1,自引:0,他引:1
采用HNO3/H2O2湿法微波消解制样,利用全谱直读电感耦合等离子原子发射光谱法(ICP-OES),全面详细地分析测定了黑芝麻中的矿质元素,共检出Ca、P、S、Mg、K、Al、Si、Fe、Na、Zn、Se、Sr、Cu、Mn、Ba、B、Ti、Cr等18种矿质元素,RSD值在1.21%~10.1%,其中13种元素在5%以内。黑芝麻中所含人体常量元素Ca、P、S、Mg、K、Na等的质量分数分别为1.79%,1.08%,0.59%,0.43%,0.41%和0.009 1%;微量元素Fe、Zn、Se、Cu、Mn、B、Cr、Sr、Si、Al等的含量分别为18.6,4.55,3.87,1.74,1.62,0.91,3.21,78.8,125.8 mg/100 g,未检出Pb、Hg、Cd、As以及Ni、Co、Mo等元素。 相似文献
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用X-射线荧光光谱仪测定钛铁中Si、Mn、P、Al、Cu的含量。通过对制样方法的研究,确定了合适的研磨时间、压力和保压时间,选择了仪器的最佳测量条件,用压片法在X-射线荧光光谱仪上建立了元素的工作曲线;通过强度测量与化学比对,精度、准确度能满足分析需要。 相似文献
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《中国石油和化工标准与质量》2017,(9)
论述了X荧光光谱测定高合金钢中Si.Mn.P.Ni.Cr.Mo的分析方法,并考察了准确度,精密度。研究表明:Si.P受Mo.Mn.W等元素的影响,必须进行校正,方法准确度和精密度令人满意,操作十分简便,快速。 相似文献
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In this study, the extrusion processing behaviors of polystyrene (PS), ethylene–propylene–diene terpolymer (EPDM), and their blend (PS/EPDM, 80/20) were studied by using a special ultrasonic oscillation extrusion system developed in our laboratory. The die pressure and volume flow rate were measured at different ultrasonic intensities and screw rotation speeds. The dependences on ultrasonic intensity of die pressure, volume flow rate, and apparent viscosity of polymers, as well as die swell at the same screw rotation speed were investigated. The effects of screw rotation speed on the processing behaviors of polymers and their blend at the same ultrasonic intensity were also studied. The experimental results showed that in the presence of ultrasonic irradiation, the processibilities of polymers and their blend were improved. Their possible mechanism is discussed in this article. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1856–1863, 2006 相似文献
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针对复盐沉淀法(氢氧化钙与亚硝酸钙反应生成复盐沉淀)处理烟气中臭氧氧化氮氧化物的液相吸收产物亚硝酸钙,采用控制变量法对此反应的诸多影响因素(反应温度、反应物浓度、反应过程扰动和反应物形态等)进行了试验研究.结果表明:为提高复盐沉淀效率,需要选择合适的反应温度(80℃最佳),同时反应物投药量的增加以及反应过程湍流度的增大都能够有效提高复盐共沉淀效率.复盐沉淀会伴随着氢氧化钙的析出而动态产生,构建氢氧化钙的析出条件能提高亚硝酸钙捕集效率. 相似文献
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《Carbon》2014
A simple and efficient sonoelectrochemical method was proposed for the preparation of blue fluorescent carbon nanoparticles (CNPs) in pure water. Benefiting from the combination of the high intensity electric field and the ultrasonic field, pure blue fluorescent CNPs were rapidly generated without any complex purification. The obtained CNPs possess excellent fluorescent property and thermodynamic stability in aqueous solution. The effects of the high intensity electric field and the ultrasonic field on the fluorescent property of the electrolytic products were also investigated. Compare to the normal electrolysis, the high intensity electric field played a crucial role in improving the product purity. On the other hand, the electrolytic efficiency was obviously enhanced, since the ultrasonic field could act synergistically with the high intensity electric field. The obtained CNPs have the potential for application in bioimaging, immuno-labeling and fluorescence detection. 相似文献
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悬浮态TiO_2光催化降解腐殖酸的影响因素研究 总被引:1,自引:0,他引:1
在悬浮态TiO2光催化体系中,探讨了光催化氧化降解腐殖酸的规律,考察了催化剂投加量、腐殖酸溶液初始浓度、初始pH值、光强、反应时间等因素对腐殖酸去除效果的影响。结果表明,光催化氧化法降解腐殖酸的效率比直接光解法有显著提高,腐殖酸的去除率从34.73%增加到65.61%(反应时间为3 h);TOC的去除率也大幅度提高,直接光解反应对TOC几乎无去除作用,而光催化氧化对TOC的去除率达37.5%;腐殖酸的初始浓度增加,初始pH值降低,光强增大,光照时间延长均能提高腐殖酸的降解率,其中pH值和光强的影响较为显著。另外,催化剂的投加量存在一个最佳值。 相似文献
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制备工艺对PTC复合材料阻温特性的影响 总被引:3,自引:0,他引:3
研究了密炼工艺对聚乙烯/炭黑复合材料室温电阻率及PTC强度的影响,针对一定配方找到了最佳密炼工艺条件。电子束辐照交联能有效消除NTC现象和提高材料的电性能循环稳定性,有助于制备低电阻率、高PTC强度并具有较好电性能循环稳定及热敏开关特性和电路保护元件。 相似文献
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To improve the separation performance of a supersonic gas separation device for the treatment of gas mixture with a single heavy component, a novel structure with shorter settlement distance was constructed and a method of droplet enlargement was applied. A series of experiments were carried out in the improved separation device under various conditions, using air-ethanol vapor as the medium and micro water droplets as nucleation centers. The effects of the inlet pressure, temperature and relative humidity, the swirling intensity, and mass flow rate of water on the separation performance were investigated. The separation was improved by increasing the inlet pressure and relative humidity. With the decrease of swirling intensity and mass flow rate of water, the separation efficiency increased first and then decreased. The inlet temperature had a slight effect on the separation. The results showed that the separation performance was effectively improved using the proposed structure and method, and the best separation in this study was obtained with the ethanol removal rate about 55% and dew point depression 27 K. The addition of water had little pollution to the air-ethanol vapor system since the water carry-over rate was within the range of %-0 in most cases. 相似文献
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Chaoqun Zhang Zhongbing Huang Xiaoming Liao Guangfu Yin Jianwen Gu 《Journal of Coatings Technology and Research》2012,9(5):621-628
In this study, co-doped ZnO rod arrays with wurtzite crystal structure were successfully prepared on zinc substrate by the co-precipitation method. The results of crystal analysis indicated that the dopant Co2+ was incorporated into ZnO crystal. Photoluminescence (PL) spectra and magnetization curves proved that their PL intensity and ferromagnetism were increased with the increase of Co2+ concentrations in a ZnO host. Current?Cvoltage characteristic curves of Co-doped ZnO rod arrays indicated that as-prepared samples were n-type semiconductors. Co-doped ZnO rod arrays could be envisioned to detect diseases and bacteria based on these properties. 相似文献
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荧光光谱法检测除草剂萘氧丙草胺 总被引:1,自引:0,他引:1
研究了酸度、有机溶剂对萘氧丙草胺(napropamide)荧光强度的影响。结果在pH2.20的0.10mol/L檬酸钠-盐酸缓冲溶液介质中,加入1.00ml乙腈,体系的荧光强度极大地增强。方法的线性范围5.0-1500ng/ml,检测限为1.5ng/ml,λex/em=285/339nm,方法用于河水中萘氧丙草胺含量的测定,结果令人满意。 相似文献