An unknown GC/MS peak becomes much more useful once you can determine what it may be and estimate how much is present. In this video, I show how I work through an unknown peak in MSD data. I cover: • Selecting the unknown chromatographic peak • Reviewing the mass spectrum • Using a library search for tentative identification • Evaluating the library match • Comparing the unknown response to a known compound • Estimating the unknown compound concentration from the response Lib

Sometimes you know which compound you are looking for, but you do not know where it appears in the chromatogram. In this video, I show how I use the NIST mass spectral library and extracted-ion chromatograms to locate a specific compound in GC/MS data. I cover: • Searching the NIST library for the compound • Reviewing the reference mass spectrum • Selecting characteristic ions • Returning to the sample chromatogram • Extracting those ions from the data • Looking for peaks whe

An unknown GC/MS peak becomes much more useful once you can determine what it may be and estimate how much is present. In this video, I show how I work through an unknown peak in MSD data. I cover: • Selecting the unknown chromatographic peak • Reviewing the mass spectrum • Using a library search for tentative identification • Evaluating the library match • Comparing the unknown response to a known compound • Estimating the unknown compound concentration from the response Lib

How to correctly trim or clip a capillary GC column before installation. In this hands-on video, I demonstrate how I prepare and cut the end of a capillary GC column to create a clean, square column end before installing it into the GC inlet. Topics covered: • Inspecting the column end • Using a ceramic scoring wafer / column cutter • Making a clean square cut • Avoiding crushed or angled column ends • Checking the cut before installation • Installing the trimmed column into

How to replace the inlet liner and O-ring in an Agilent 7890 split/splitless GC inlet. In this hands-on maintenance video, I show the complete process of accessing the inlet, removing the existing liner, installing a clean liner with the correct O-ring, and reassembling the inlet. Topics covered: • Removing the autosampler injector tower • Cooling and depressurizing the inlet • Removing the top insert assembly • Removing the old inlet liner • Installing the liner O-ring • Ins

How to replace the gold seal on an Agilent 7890 GC inlet. This video shows the hands-on process of removing the lower inlet hardware, replacing the gold seal, reassembling the inlet, and reinstalling the GC column. For trace-level GC/MS analysis, inlet contamination and active surfaces can contribute to poor response, peak tailing, discrimination, elevated background, and failing CCVs. Gold seal replacement is an important part of maintaining a clean and inert GC inlet flow p

In this hands-on video, I show how I replace the split/splitless inlet EPC pneumatic module on an Agilent 6890 GC. This repair involves going beyond routine inlet maintenance and accessing the internal pneumatic system of the gas chromatograph. In the video, I cover: • Opening the GC and accessing the EPC module • Disconnecting the pneumatic and electrical connections • Removing the old split/splitless inlet EPC module • Installing the replacement module • Reconnecting the sy