GC-MS 3100 Gas Chromatograph–(Quadrupole) Mass Spectrometer

Uses and Specification
Currently, among the analytical instruments, the chromatograph instruments are of important roles. Since the chromatograph columns of the chromatograph instruments have high efficiency separation ability and are able to separate the matters according to the value of retention time and to determine the nature of matters by the method of comparing with the retention time of the standard material, the instruments are difficult to perform qualitative analysis for unknown samples. While, the MS directly measure the ratio of mass over electrons (m/z) of the matter and it is accurate and quick in the aspect of qualitative analysis. The combined use of chromatograph and mass spectrometer is, actually, uses the mass spectrometer as a general detector for the chromatograph. The chromatograph has many detectors, such as TCD, FID, ECD, FPD, NPD and etc, and each detector has a certain scope and applications, not general, and it causes inconvenience in use. The mass detector of the mass spectrometer can replace all the detectors of chromatograph. They are general and very easy to use. So, chromatograph-mass spectrometer combines the high efficiency separation ability of chromatograph with the accurate discrimination ability for the unknown samples, raising the ability of the analytical instruments to a new level. All the fields that can use chromatograph are able to use chromatograph-mass spectrometer. Currently, it is universally recognized that the instrument of chromatograph—mass spectrometer is the top of the current analytical instruments.

Chromatograph—Mass Spectrometer is the result of close combining of 3 modern technologies, technology of chromatograph, technology of mass spectrometer, and technology of computer. Due to the big difficulty in technology, China can not manufacture all along. And each year, a large amount of foreign currency is used for importing such kind of instruments. According to the statistics, in year 2005, China imports around 600 units of all kinds of Chromatograph—Mass Spectrometer. The average price of each unit is around RMB 600,000 ~ 1,000,000. The GC-MS 3100 Gas Chromatograph – Mass Spectrometer, developed by East & West Analytical Instruments, Inc. is the first commercial chromatograph—mass spectrometer in China and each technical feature reaches the advanced level of the current international technologies.

Be able to Equip Foreign Spectrogram Databases, such as NIST, WILEY, DRUG and etc. to Realize Automatic Searching.

Application Scope of Chromatograph—Mass Spectrometer
1. All the Situations where Gas Chromatograph is Needed, especially where Quantitative Analysis for Unknown Samples is Required.
2. Handle each kind of Emergencies, such as Leakage of Harmful Material and Heavy Environment Disasters and etc.
3. Anti-Terrorism Battles, Drug Prohibition and Arrest Drug Dealers, Analysis of Explosive Materials and etc.
 
Major Technical Features
1. Mass Scope: 1.5 ~ 800 amu
2. Mass Resolution: >2M
3. Scan Speed: Fully Tunable for Whole Scope. Max 3000amu/sec
4. Ion Source: EI Electron Bombardment Source. Independent Heating System, Adjustable between 120 ~ 350℃
5. Detector: Electron Multiplier
6. Vacuum System: (Standard Equipment) 70L/s Air Cooling Turbulent Molecular Pump with Front Stage Vacuum Pump. Optional 240L/s Turbulent Molecular Pump
7. Chromatograph Equipment: GC-4000A Series FID Single Detector with Capillary Tube Sample Injection System. GC-MS is Directly Connected by Capillary Tube. Temperature of Transportation Wire is Adjustable between 50 ~ 350 ℃.
8. Computer System: Inside the Instrument, there is Computer System to Perform Data Processing and Automatic Control. Can Add PCs and Printers of any Model.

Basic Working Principle
For the normal work of the MS, it is a must to form the vacuum chamber of the high vacuum system. Our instrument utilizes the high performance turbulent molecular pump and the front stage vacuum pump to ensure vacuum. Only under the condition of high vacuum, can it reduce the unnecessary ion collision, to lower the background noise and memory effect. The samples for analysis first are separated through the capillary tube inside the chromatograph, and then into the ion source. By using the heated electrons to bombard the vaporized sample, to hit off the out layer electrons, generating positive ions, after the effect of electrodes of repelling, focusing and extraction, the positive ions are sent into the quadrupole system. Under the joint effect of high frequency voltages and the positive-negative voltages, the quadrupole forms the high frequency electric field. Under the effect of scan voltage, only the ions satisfying the requirement can pass the symmetrical center of the quadrupole, to enter the electron multiplier. The after the ion flow is amplified by the amplifier, it generates the mass spectrogram signals. Change of the scan voltages will make ions of different masses be accepted by the electron multiplier one after another, generating the mass spectrogram, to discriminate the composition of unknown samples.