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环境污染问题日趋严重,为了对环境污染物进行检测,必须研究高灵敏度的检测手段,IMS的特点决定了其非常适合对环境污染物中的痕量物质进行检测。由于目前IMS在环境污染检测方面的应用尚属起步阶段,本文主要介绍了国外目前应用IMS检测环境污染的研究进展,以期对IMS在国内的研究和发展起到一定的借鉴作用。 相似文献
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一种新的绿色化学技术:超临界萃取作为样品制备技术在痕量药检分析中的应用 总被引:3,自引:0,他引:3
综述了超临界萃取作为样品制备技术在痕量药检分析中的应用.研究了生物基质对有效萃取目标检测物的影响及提高萃取率的途径.并重点评述了减少类脂杂质、选择性的分离目标检测物的非在线吸附剂收集与在线吸附剂收集技术.从而展示了SFE作为绿色化学技术具有萃取率高、使用溶剂少,分离步骤少,环境无害等明显优于传统方法的特点. 相似文献
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简述生态环境监测量值溯源现状,总结在仪器管理、仪器检定校准过程和仪器检定校准方法上存在的不足,提出加强量值溯源体系监管、加快研究和制订或修订生态环境监测仪器的计量技术规范、强化计量保障能力、提升痕量及超痕量污染物监测数据质量、有效建立在线及自动监测仪器设备量值溯源体系等健全生态环境监测量值溯源体系的建议。 相似文献
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一种新的绿色化学技术:超临界萃取作为样品制备技术在痕量药检分析中的应 总被引:4,自引:0,他引:4
综述了超临界萃取作为样品技术在痕量药检分析中的应用。研究了生物基质对有效萃取目标检测物的影响及提高萃取率的途径。并重点评述了减少类脂杂质、选择性的分离目标检测物的非在线吸附剂收集与在线吸附收集技术。从而展示了SFE作为绿色化学技术具有萃取率高、使用溶剂少,分离步骤少,环境无害等明显优于传统方法的特点。 相似文献
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Ion mobility spectrometers (IMS) are small, lightweight, extremely robust devices with low power requirements, no moving parts, no absolute requirement for gases or vacuums, that can be operated at
ambient temperatures and pressures, and yet are capable of measuring vapour phase concentrations of organic chemicals at very low levels (sub-μg/l). IMS are capable of analysing complex mixtures and producing a simple spectral output. Volatile components produce measurable negative and positive product ions in the spectrometer through chemical ionization. The spectra produced are essentially the vapour phase fingerprints of the target molecules/mixture. Quantitative data can be obtained provided instrument response is within the linear dynamic range of these instruments, but most practical applications of IMS have used the technology in a qualitative manner in situations which require just an above/below threshold or positive/ negative response.In the manufacturing industry there are many examples where the aroma/odour of raw materials has safety or product quality implications. IMS was not developed to replace traditional methods of analysis, e.g. GC/MS or sensory panels, but rather to provide a rapid, qualitative response complementary to more established methods. This paper reports on the use of a hand-held ion mobility spectrometer to characterize the vapours produced by volatile organic compounds,fresh herbs and retail spice mixtures at ambient temperature and pressure. The results show that by monitoring in both ion acquisition modes, ion mobility spectrometers are capable of discriminating between a wide range of products. 相似文献
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易制毒化学品管理与检测 总被引:1,自引:0,他引:1
根据《易制毒化学品管理条例》和《中华人民共和国禁毒法》,由工作实践中发现易制毒化学品的日常管制中出现的问题,说明加强易制毒化学品检测的重要性。并介绍了离子迁移谱这种检测技术在易制毒化学品的检测和稽查中发挥的作用。 相似文献
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A new modification of electrical low pressure impactor (ELPI) for the particle effective density measurement is presented. The system is capable of real-time operation and it is based on the serial measurement of mobility and aerodynamic diameter. In the studied configuration, a zeroth order mobility analyser is installed inside of the ELPI-instrument. The system is feasible for single modal distributions. For several particle materials and varying size distributions, the measured average density values were within 15% of the values obtained with a reference method. 相似文献
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以DQC的管理形式,通过人、机、料、和环等多环节进行生产中的微生物控制。并制定了相关的微生物防控措施,参考和执行与日化相关的卫生标准。 相似文献
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Oxidative folding in the mitochondrial intermembrane space (IMS) is a key cellular event associated with the folding and import of a large and still undetermined number of proteins. This process is catalyzed by an oxidoreductase, Mia40 that is able to recognize substrates with apparently little or no homology. Following substrate oxidation, Mia40 is reduced and must be reoxidized by Erv1/Alr1 that consequently transfers the electrons to the mitochondrial respiratory chain. Although our understanding of the physiological relevance of this process is still limited, an increasing number of pathologies are being associated with the impairment of this pathway; especially because oxidative folding is fundamental for several of the proteins involved in defense against oxidative stress. Here we review these aspects and discuss recent findings suggesting that oxidative folding in the IMS is modulated by the redox state of the cell. 相似文献
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目的探讨有机磷中毒合并中间综合征(IMS)患者预后的影响因素。方法回顾性分析60例有机磷中毒合并IMS患者的病例资料,包括一般情况、洗胃时间、气管切开与气管插管、血液灌流、机械通气时间,发生IMS的时间、心率、白细胞计数、胆碱酯酶活性等。根据生存情况分为生存组33例,死亡组27例。结果 2组的心率、白细胞计数、胆碱酯酶、发生IMS的时间比较差异均无统计学意义(P相似文献
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G. Steiner J. Kangasluoma V.-M. Kerminen M. Kulmala T. Petäjä 《Aerosol science and technology》2017,51(8):946-955
Measuring aerosols and molecular clusters below the 3 nm size limit is essential to increase our understanding of new particle formation. Instruments for the detection of sub-3 nm aerosols and clusters exist and need to be carefully calibrated and characterized. So far calibrations and laboratory tests have been carried out using mainly electrically charged aerosols, as they are easier to handle experimentally. However, the charging state of the cluster is an important variable to take into account. Furthermore, instrument characterization performed with charged aerosols could be biased, preventing a correct interpretation of data when electrically neutral sub-3 nm aerosols are involved. This article presents the first steps to generate electrically neutral molecular clusters as standards for calibration. We show two methods: One based on the neutralization of well-known molecular clusters (mobility standards) by ions generated in a switchable aerosol neutralizer. The second is based on the controlled neutralization of mobility standards with mobility standards of opposite polarity in a recombination cell. We highlight the challenges of these two techniques and, where possible, point out solutions. In addition, we give an outlook on the next steps toward generating well-defined neutral molecular clusters with a known chemical composition and concentration.
Published with license by American Association for Aerosol Research 相似文献