Potential Benefits of Comprehensive Two=Dimensional Gas Chromatography — High Resolution Time-of-Flight Mass Spectrometry (GCxGC-HRTOFMS)
Poster Jun 06, 2014
Mark Merrick, Viatcheslav Artaev
GC×GC systems, both commercial and non-commercial, vary in performance. There are two key performance characteristics that determine the performance of a GC×GC system—injection peak width and modulation speed. For typical column configurations (30–60 m first column) an injection peak width with <10 ms and a modulation period as short as 1 second are required. If either of these are less than optimal, the peak capacity and resolution in the first and second dimensions will be compromised. To obtain the best results from a high performance GC×GC system, the detector must be capable of high data acquisition rates. For a typical GC×GC column configuration, a data acquisition rate of approximately 200 spectra/s is required. Slower detectors are used with sub-optimal GC×GC systems and/or sub-optimal column sets and conditions to match the peak width with the data acquisition rate. GC×GC-TOFMS with nominal mass resolution has demonstrated its high performance in various application areas over the past several years and is considered one of the most powerful techniques for targeted and non-targeted analysis of complex volatile and semi-volatile mixtures.
High resolution mass spectrometry is well-known for its increased selectivity. This poster presents preliminary data for a sewage treatment plant water extract collected on a research prototype GC×GC-HRTOFMS and compares the results of a selected region to those obtained by GC-HRTOFMS.
Fundamentals and Comparisons for Organic Sample Extract EvaporationPoster
Sample preparation is a key step in the analysis process
Parameters for evaporation and their impact on analysis have been discussed
Improvements in matching the sample to the evaporation device characteristics can help reduce variability and improve recovery
Examples for choosing a system based on sample volume, types of analytes, sample load, and initial investment considerations
Using Elemental Analysis For Discrimination Of Pinot Noir Wines From Six Different Districts In An AvaPoster
The determination of geographical origin of wine is gaining increased interest by researchers and federal agencies around the world, partially due to increased fraud with regards to place of origin labelling. For wine, multi-elemental profiling of macro, micro, and trace elements has been proposed for determination of authenticity. Commercial wines from different wineries in 5 different neighborhoods within one AVA show characteristic elemental fingerprints. Macro, micro and trace elements as well as elemental ratios contribute to the observed separation, indicating the involvement of multiple factors and underlying mechanisms, including location and soil composition, elemental uptake by vine and rootstock, viticulture and nutrient management, water sources, and small differences in the different wineries.READ MORE
Fast arsenic speciation analysis of wines and rice with LC-ICP-QQQPoster
This method was designed in response to recent and proposed food standards, both international and national, that limit inorganic arsenic rather than total, organic, or individual arsenic species such as arsenite (AsIII) and arsenate (AsV). Analysis time is 10x faster than the current FDA regulatory method, increasing sample throughput, avoided spectral interferences and dramatically increased sensitivity. Validation data from two laboratories demonstrate the method’s accuracy and reproducibility of both wine and rice matrices in a single analytical batch.READ MORE