GC-MS

Gas Chromatography Mass Spectrometry

Make: Thermo Fisher Scientific

Model: Trace GC Ultra with DSQ-II

Principle:

  • The Gas Chromatography Mass Spectrometry (GC MS) instrument separates chemical mixtures (the GC component) and identifies the components at a molecular level (the MS component).
  • The sample is introduced on a vapour at the head of the column, distributed themselves between this phase and the gaseous mobile phase. Elution is accomplished by facing an inert carrier gas like He or N2 through the column. The sample components become distributed in the gas phase. These components therefore travel more slowly than a carrier gas because they are being retarded by virtue of their interaction with the carrier gas. The retarding effect is different for different components on the other hand, those components whose solubility in the mobile phase is negligible move rapidly through the column.
  • Mass spectrometry (MS) is an analytical technique that measures the mass-to-charge ratio of charged particles. It is used for determining masses of particles, for determining the elemental composition of a sample or molecule, and for elucidating the chemical structures of molecules, such as peptides and other chemical compounds. The MS principle consists of ionizing chemical compounds to generate charged molecules or molecule fragments and measuring their mass-to-charge ratios.

Accessories:

1.  To allow changing the columns with out disturbing the vacuum in MS

Gc with Flame Ionization Detector, Head Space Technology and Mass Spectrometry with Quadrapole Mass Analyzer.

Applications:

  1. Environmental monitoring and cleanup
  2. Criminal forensics
  3. Law enforcement
  4. Food, beverage and perfume Analysis
  5. Medicine

Instrument Parameters:

  1. The oven temperature  is between ambient to 4500C or more
  2. The liquid  autosampler  has a tray for minimum 150 samples
  3. Quadrapole Mass analyser and  Up to 1050 amu
  4. The MS must has auto tune program for EI with tuning solution (Per Fluoro Tributyl Amine (PFT)
  5. Latest NIST library
  6. Scan speed 11,111 amu/s

RoHS Elements:

Polybrominated Biphenyls (PBBs) and Polybrominated Diphenyl Ethers (PBDEs)

Calibration Graphs:

Working range Used: 100 ng/ml to 500 ng/ml for PBBs and PBDEs

Advantages:

  1.  High sensitivity
  2. Excellent detection limits
  3. High selectivity
  4. Identification is based on two parameters not one  (retention time and mass   spectrum must match standard)   Speed
  5.  Typical analysis takes from ½ hour to approx 1 hour.
  6.  Analysis can contain upwards of 10 and more pollutants.

   Disadvantages:

                 1)  Higher Capital Cost

                2)   Higher maintenance (Time, expertise and money)

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CONTACT US
for more information
Dr. U. Rambabu,M.Phil.;Ph.D
Quality Manager
 
C-MET, IDA, Phase III, Cherlapally,
HCL Post, Hyderabad- 500051
Email: rambabu[at]cmet[dot]gov[dot]in;
rambabu32[at]rediffmail[dot]com
Ph :+91-40-27265673; 2720327;
Mobile: +91-9441435672;
9010984021
Fax: +91-40-27261658

 

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