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Improve Trace Analysis of Acetylene, Propadiene, and Methyl Acetylene Impurities with Higher Capacity Alumina MAPD Columns (PDF 351kB)

... trace impurities in petroleum gases, such as propylene, ethylene, or 1,3-butadiene, column capacity surface. Using a higher capacity column with an appropriate deactivation is a good strategy for reducing...

The GC Separation Process A simple model for non-mathematically minded chromatographers

... or megabore columns become so popular? Column capacity Steps 1 and 3 :insufficient column capacity. Step 3 assumes that during take off the solute molecule is surrounded by stationary ... . The relationships among phase, flow, temperature, and capacity are explored. ... Gas chromatography, stationary phase, flow, column capacity, GC, Konrad Grob...

ChromaBLOGraphy: Sample loading capacity for PAHs on a 30m x 0.25mm x 0.25µm Rxi-5ms GC column

Sample loading capacity for a GC column (also known as “column capacity” and “sample capacity”) is essentially the amount of non-active compound that can be put on a GC column and chromatographed at some set of conditions where the peak shape is symmetrical. Conversely, if a GC column is overloaded with a component amount, the […]

News: Improve Trace Analysis of Acetylene, Propadiene, and Methyl Acetylene Impurities With Higher Capacity Alumina MAPD Columns

Author(s): Rick Morehead, Jan Pijpelink, Jaap de Zeeuw Published By: Petro Industry News Year of Publication: 2011 Link: http://www.restek.com/Technical-Resources/Technical-Library/Petroleum-Petrochemical/petro_PCAN1537-UNV Abstract: When analysing trace impurities in petroleum gases, such as propylene, ethylene, or 1,3-butadiene, column capacity (loadability) is an important factor in obtaining accurate … Continue reading

Guide to Preparing and Analyzing Semivolatile Organic Compounds (PDF 6275kB)

... to eliminate the source of the overload. Column capacity also must be addressed when optimizing the analysis there is a loss of analyte in any splitless injection, calculation of the necessary column capacity is not simple...

ChromaBLOGraphy: How to choose the correct GC column – Part 3

In this post, I will explain how one can use column capacity (along with detector selection) to help narrow down GC column choices even further. Before reading this post, I suggest you review Parts 1 & 2, which can be found in the links below. Part 1: http://blog.restek.com/?p=5426 Part 2: http://blog.restek.com/?p=5494   First, let’s talk [...]

A Guide to the Analysis of Chiral Compounds by GC (PDF 3410kB)

... when column capacity has not been exceeded. Figure 15A shows the enantiomeric separations of linalool though the maximum sample capacity for 0.32mm ID capillary columns is normally 400500ng per component...

Operating Hints for Using Split/Splitless Injectors (PDF 1212kB)

... is necessary to ensure that the column is not overloaded and is operating within its capacity limits. Although quantitative analysis does not require that the on-column concentration be known, exceeding column capacity...

Analyze Seven EPA Methods on One GC Column Pair! Pesticides, PCBs, Herbicides, and More on Rtx-CLPesticides & Rtx-CLPesticides2 Columns (PDF 5571kB)

... column capacity, meaning faster sample throughput for your laboratory. Parallel dual-column analysis Restek GC Columns Analyze Seven EPA Methods on One GC Column Pair! Pesticides, PCBs, Herbicides...

Using Micropacked Columns

... traditional packed columns, and higher capacity than wall coated open tubular (WCOT) capillary columns , internal diameter affects column capacity. If you intend to use a sensitive detector, such as a helium ... Micropacked columns are 1-2 meter, 0.75-1.0mm ID packed stainless steel columns with performance characteristics intermediate between conventional packed columns and capillary columns. They are inexpensive, very...

ChromaBLOGraphy: How to choose the correct GC column – Part 2

My last post looked at how to use published boiling points of compounds to help select a GC column. In this post, I will be discussing the role of compound polarity when selecting a GC column.   To briefly summarize my column selection process (discussed in Part 1 http://blog.restek.com/?p=5426 )   My four categories of [...]

Faster Organochlorine Pesticide Sample Throughput On New Rtx-CLPesticides & Rtx-CLPesticides2 Columns

... rapid analysis without sacrificing column capacity, which translates, of course, into improved sample columns. As the environmental testing market continues to be very ... . Here we introduce new film thicknesses for the Rtx-CLPesticide and Rtx-CLPesticide2 GC columns , optimized for complete separations and short analysis times. Using these new columns, all US EPA Method 8081...

ChromaBLOGraphy: Solvent Focusing – The Key to Successfully Implementing CSR-LVSI

It’s been over a month since my last post on Concurrent Solvent Recondensation – Large Volume Splitless Injection (CSR_LVSI), so I thought I would cover solvent focusing, a key element of the technique, today. The CSR-LVSI solvent peak widths are minutes larger than those seen in a typical 1 µL injection. Figure 1 shows the difference in solvent […]

ChromaBLOGraphy: How to choose the correct GC column – Part 1

A month or so ago I gave a short training session to a few beginners on how to go about choosing a GC column. After all, there are thousands of Restek column catalog numbers to choose from (not to mention numerous custom catalog numbers), so if an analyst doesn’t have a method which specifies which [...]

ChromaBLOGraphy: General (very general) guidelines to help meet GC detection limits.

Sometimes we (tech service) receive requests from customers who cannot meet detection limits when developing a new method or when trying to follow a current method. They ask for advice on how to meet these limits.  As a result, I decided to provide some (very) general guidelines that I would follow back-in-the-day when I would […]

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