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Centri 259 Improving the performance of headspace sampling using trap-based preconcentration
This study shows how large-volume and splitless injections can be used to improve the sensitivity of headspace sampling without compromising chromatography, as well as simplifying method development.
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Centri 258 Enhancing laboratory throughput using fully automated high-capacity sorptive extraction
This report describes how laboratory throughput for sampling of volatiles from liquid or solid matrices can be more than doubled, by using HiSorb high-capacity sorptive extraction on the Centri automated multi-mode sampling and preconcentration platform.
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Centri 257 Improving the performance of SPME using trap-based preconcentration with enrichment
This study shows that enhancing conventional SPME by using trap-based preconcentration, with enrichment by ‘sample stacking’, greatly improves the number of compounds identified, thus expanding the applicability of SPME in GC–MS analysis.
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全二维气相应用指南
20 世纪70 年代,GC × GC 首次引起人们关注,然而,多年以来传统GC–MS 技术依然发展迅速,这意味着尽管新技术具有卓越的分离性能,但并不值得运用如此额外复杂的技术。由于硬件和软件的进步,这种情况已经大为改观,GC × GC 现在广泛应用于各种领域。本指南仅仅展示GCxGC全二维气相部分最重要的应用。
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Centri 256 Analysis of volatile organic pollutants in water using headspace–trap GC–MS: Maximising performance for ppt-level VOCs
This study demonstrates the analysis of a broad range of trace-level volatile organic compounds in drinking water using the headspace–trap sampling mode of the Centri automated multi-mode sampling and concentration system. Analysis of a 72-component standard mix using GC–MS with selected ion monitoring (SIM) acquisition provided mean detection limits as low as 2 ppt, with excellent mean linearities (R2 0.999), recoveries
(97.8%) and repeatabilities (4.7% RSD) – performance that is comfortably lower than required by all major regulations. In addition, tap water was analysed and found to contain a range of VOCs at low-to-medium levels (2–200 ppt), in addition to ppb-level chlorinated compounds.
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Centri 255 基于冷阱富集聚焦的预浓缩技术与GC-MS联用定量分析水中痕量异味物质:SPME固相微萃取和Hisorb高容量吸附萃取棒的性能对比
这项研究表明,使用新型Centri®自动化多模式采样和浓缩系统提取和浓缩水中的痕量异味化合物,使用两种顶空进样方法SPME固相微萃取和HiSorb高容量吸附萃取棒——基于冷阱富集聚焦的预浓缩技术与GC-MS联用进行数据分析。目标分析物IPMP,IBMP,2-MIB,2,4,6-TCA和土臭味素的性能符合ISO 17943和GB 5749的要求,线性> 0.996,平均MDL约为1 ppt。 我们还描述了每种采样方法的关键属性,并讨论了Centri提供的选项,这些选项允许根据特定的应用要求进行最佳匹配。
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Centri 255 Quantifying trace odorants in water by GC–MS with trap-based preconcentration: Assessing SPME and high-capacity sorptive extraction
This study describes the use of the new Centri sample automation and concentration platform to extract and quantify trace-level odorants in water, using two headspace sampling methods – multi-phase SPME fibers or HiSorb high-capacity sorptive extraction probes – in conjunction with trap-based preconcentration and GC–MS. Performance for the target analytes IPMP, IBMP, 2-MIB, 2,4,6-TCA and geosmin was within the requirements of ISO 17943 and GB 5749, with linearities >0.996 and mean MDLs of the order of 1 ppt. We also describe the key attributes of each sampling method, and discuss the options offered by Centri that allow the optimum choice to be made based on specific application requirements.