Agilent 5973N Benchtop GC/MSD/Atomic Emission Detector (AED) with HP Automatic Liquid Sampler. Agilent ChemStation for GC control and data handling. NIST MS Spectral Library and NIST Chemical Structures Database.

For most GC detectors, identification is based solely on retention times and is performed by comparing the retention time of the unknown peak to that of a standard. Since many compounds may possess the same retention time, there is always a doubt about the nature and purity of the compound in the separated peak. Among all detectors available in the lab, there is only one which provides additional qualitative (structural or elemental) information about the sample lacking in other GC detectors, and, therefore, is used directly for compound identification. This is Mass Selective Detector (MSD or MS).

 

 

This system is the most updated GC/MS (quadrupole) system available in the Material Characterization Laboratory. The instrument is equipped with turbomolecular pumps and is operated in either electron impact or chemical ionization (positive and negative) modes. Among the most important advantages of 5973N mass selective detector, crucial for our applications are: high sensitivity (1 pg of octafluoronaphtalene with a signal to noise ratio of 10:1 with EI-SCAN mode) and a wide mass range from 1.6 to 800 amu for expanded compound identification. These features allow the detection and quantitative measurements of PCBs, dioxins, pesticides and other pollutants in a variety of environmental matrices and at very low concentrations. The HP MSD ChemStation provides complete automation of an integrated system (GC, MSD and automatic liquid sampler) and, therefore, improves productivity. MSD tuning, sample introduction, signal acquisition, data processing are automated by ChemStation methods. The NIST 08 Mass Spectral Library (192K compounds and 220K spectra) allows searching mass spectral database for the best spectral match of the analyte with the library and make mass spectrum interpretation easier.


Hewlett Packard 5972A Benchtop GC/MSD with HP Automatic Liquid Sampler/  Hewlett Packard ChemStation for GC control and data handling. NIST MS Spectral Library.

This GC/MS (quadrupole) system is earlier version of the Agilent GC/MS system. Its vacuum system is maintained by diffusion pump instead of turbomolecular in the above-mentioned GC/MS. The instrument is operated in either electron impact or chemical ionization (positive and negative) modes.