共查询到19条相似文献,搜索用时 125 毫秒
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《中国无机分析化学》2020,(2)
在线分析技术由于其具有实时、准确、高效的特点,近年来得到快速发展,已被广泛应用于环境、矿业、冶金、生物医药和食品等领域。重点介绍了国内X射线荧光光谱、激光诱导击穿光谱、瞬发γ中子活化、双能量γ射线透射、原子荧光光谱、近红外光谱和质谱法等在线分析技术近十年来的发展和应用情况,并对在线分析技术未来发展趋势进行了展望。 相似文献
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X-射线荧光光谱分析技术的发展 总被引:4,自引:0,他引:4
归纳了X-射线荧光光谱分析技术发展的进程。从现代控制技术的改善、仪器检测性能的提高、元素检测范围的扩大等8方面阐述了波长色散X-射线荧光光谱技术的进展,还就能量色散X-射线荧光光谱仪的X射线管和探测器技术的快速发展及近10年来我国在X-射线荧光光谱分析方法方面的论文发表情况进行了总结,对近年来X-射线荧光光谱仪的发展趋势———手持式、偏振、微束分析等进行了评述,并对其技术的发展方向进行了展望。 相似文献
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传统的分析技术一般采用离线分析的手段,通常需要对待分析样品进行相应的预处理,存在分析结果滞后的缺陷。近红外技术可以克服这一缺点,使实验室和工厂的产品分析实现在线化,可以在几秒钟内得到待测参数。与反馈控制技术联用后,实现生产过程的在线控制。近红外光谱能够连续测定多个参数,实现绿色分析。 相似文献
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建立了动态和静态接口装置,使其能在线联用超临界色谱确定蒽在超临界二氧化碳中的溶解度及溶解平衡过程。静态接口由2个高压阀组成,动态接口由1个高压阀和1个齿轮泵组成。采用静态法测定蒽在超临界二氧化碳中的溶解度,以考察温度和压力对溶解度的影响。实验结果表明,在40~60℃和10~27.5MPa条件下,自行研制的在线超临界色谱联用体系具有较高的稳定性和较好的重现性,溶解度的相对标准偏差(RSD)为0.4%~2.4%,准确性为95.0%~97.7%。采用Méndez-Santiago Teja(MST)模型公式对实验数值关联计算,确定了蒽的溶解度与二氧化碳密度的准线性函数变化关系,计算数值与实验结果之间的相对平均绝对值偏差(AARD)为3.23和14.68。搭建的接口装置亦能够完成超临界流体技术与常规光谱、质谱分析仪器的在线联用分析,在药物合成与分析、过程分析技术(PAT)等领域具有较好的应用潜力。 相似文献
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在线采样技术能实时采样,满足在线监测的采样要求。按照采样进样介质的不同分为气体、液体、固体三类。对气体中有毒气体、大气颗粒物、VOCs,液体中水样、原油,固体中煤的机械化采样技术进行了概述,旨在帮助了解在线采样技术在国内矿业、环境行业的发展和应用。随着5G时代的到来,在线采样技术一定会发挥越来越重要的作用。 相似文献
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Tao HU Haobo BAO Changgong MENG Jun ZHAO Yongxian YU Huilong WANG Shengyang TAO Shuqin LIU 《大学化学》2018,33(11):1-5
The development and integration of information technology with higher education facilitate the construction of the first-class online course, which has been a key objective for undergraduate education reform. Based on the student-centered idea, it is a valuable exploration and practice to integrate the online course with traditional teaching, and make efforts on innovative digitized teaching mode by taking the advantage of information technology. 相似文献
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Ultra high performance liquid chromatography and supercritical fluid chromatography techniques are favored because of their high efficiency and fast analysis speed. Although many sample preparation techniques have been coupled with common liquid chromatography online, the online coupling of sample preparation with the two popular chromatography techniques have gained increasing attention owing to the increasing requirements of efficiency and sensitivity. In this review, we have discussed and summarized the recent advances of the online coupling of sample preparation with ultra high performance liquid chromatography and supercritical fluid chromatography techniques. The main sample preparation techniques that have been coupled with ultra high performance liquid chromatography online are solid‐phase extraction and in‐tube solid‐phase microextraction, while solid‐phase extraction and supercritical fluid extraction are the main techniques that have been coupled with supercritical fluid chromatography online. Especially, the strategies for online coupling of sample preparation with chromatography techniques were summarized. Typical applications and growing trends of the online coupling techniques were also discussed in detail. With the increasing demands of improving the efficiency, throughput, and analytical capability toward complex samples of the analysis methods, online coupling of sample preparation with chromatography techniques will acquire further development. 相似文献
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In this communication, we describe the design of an online multi-chromatographic approach to the routine NMR analyses of low-level components ( approximately 0.1%) in complex mixtures. The technique, termed LC(2)-SPE-NMR, optimally combines multi-dimensional liquid chromatography with SPE technology for isolating, enriching and delivering trace analytes to the NMR probe. The fully automated LC(2)-SPE-NMR system allows for maximal loading capacity (in the first, preparative LC dimension), close to optimal peak resolution (in the second, analytical LC dimension) and enhanced sample concentration (through SPE). Using this system, it is feasible to conveniently conduct a wide range of NMR experiments on, for example, drug impurities at the low microgram per milliliter level, even for components poorly resolved in the first dimension. Such a sensitivity gain significantly elevates the analytical power of online NMR technology in terms of the level at which substances of pharmaceutical significance can be structurally characterized. 相似文献
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To establish an online analytical method towards estrogenic pollutants, a covalent organic porous polymer (COP) was in-situ synthesized on the surface of basalt fibers (BFs) for in-tube solid-phase microextraction (IT-SPME). The extraction tube, obtained via placing the modified BFs into a polyetheretherketone tube, was combined with high-performance liquid chromatography (HPLC) to achieve online IT-SPME-HPLC analysis. The important parameters, including sampling volume, sampling rate, organic solvent content and desorption time, were carefully investigated. Under the optimized conditions, the online analytical method was established for five estrogenic targets, with low limits of detection (0.001–0.005 μg/L), high enrichment factors (1800–2493), wide linear ranges (0.003–20, 0.015–20 μg/L) and satisfactory repeatability. It was successfully applied to detect five estrogens in a wastewater sample and a water sample in a polycarbonate cup. The BFs functionalized with COPs displayed excellent extraction effect for estrogenic pollutants, furthermore it has great potential in sample preparation or other fields. 相似文献
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Recent developments in neutron-induced gamma activation for on-line multielemental analysis in industry 总被引:1,自引:0,他引:1
C. S. Lim 《Journal of Radioanalytical and Nuclear Chemistry》2004,262(2):525-532
Neutron-induced gamma activation is an important method for on-line multi-elemental analysis. It has a long history of use
in industrial applications, in particular the minerals and energy sectors, although it has also been applied in other areas,
including medicine and security. This paper reviews significant developments and trends of the last decade in technology,
in particular in the areas of sources, detectors and analytical methods. Changes in implementation such as the increasing
use of neutron inelastic scattering reactions and the development of on-belt designs are also discussed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Ionization suppression effects with condensed phase membrane introduction mass spectrometry: methods to increase the linear dynamic range and sensitivity
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Kyle D. Duncan Gregory W. Vandergrift Erik T. Krogh Chris G. Gill 《Journal of mass spectrometry : JMS》2015,50(3):437-443
Condensed phase membrane introduction mass spectrometry (CP‐MIMS) is an online analytical method that allows for the direct, trace level measurement of a wide range of analytes in complex samples. The technique employs a semi‐permeable membrane that transfers analytes from a sample into a flowing acceptor solvent, which is directly infused to an atmospheric pressure ionization source, such as electrospray or atmospheric pressure chemical ionization. While CP‐MIMS and variants of the technique have been in the literature for nearly a decade, much of the work has focused on instrument development. Few studies have thoroughly addressed quantitative methods related to detection limits, ionization suppression, or linear dynamic range. We examine ionization suppression in the direct rapid quantitation of analytes by CP‐MIMS and introduce several analytical strategies to mitigate these effects, including the novel implementation of a continuously infused internal standard in the acceptor phase solvent, and modulation of acceptor phase flow rate. Several representative analytes were used to evaluate this approach with spiked, complex sample matrices, including primary wastewater effluent and artificial urine. Also reported are improved measured detection limits in the low part‐per‐trillion range, using a ‘stopped‐flow’ acceptor mode. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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Ions play a pivotal role in the biological regulatory processes and catalyzing enzymatic reactions; however, increased levels in the human body leads to many health risks or toxicity. To circumvent this, periodic and precise monitoring of significant ions in environmental, biological, chemical, and food samples are necessary, which need to be mapped/monitored continuously. This has prompted researchers to develop cost-effective, handy, and rapid techniques which can be fruitful for even untrained personnel by obviating manual user instructions, lengthy sample preparation steps, and costly instruments. The exploitation of user-friendly behavior, affordable price, and ubiquitous usage of smartphones has led to the development of a plethora of smartphone-based methodologies whereby they can serve as devices, detectors, or interfaces. Their in-built high-resolution rear camera, ambient light sensors, wireless connectivity, internal storage, and global positioning systems minimize the cost and simplify the fabrication of developing point-of-care testing devices, making them operable in challenging conditions with limited resources. Coupling smartphones with iCloud technology allows the synchronous storing and online transmitting of databases to consumers even in remote areas, which helps in real-time monitoring and continuously scrutinizing contaminants in the environment. This is not an exhaustive review but enumerates the progress made in the development of smartphone-based analytical aids by incorporating advanced device fabrication strategies and hassle-free analytical protocols during the past years (2014–2021). An account of key features like sensing performance of the developed methods in terms of selectivity, sensitivity, and detection limits and their limitations for recognition of environmental and biologically eminent ions is also discussed. Lastly, this review paves the way for the development of advanced innovative analytical techniques employing smartphone technology for the foreseeable future to ensure point-of-care human safety. 相似文献