Gas Chromatograph-Mass Spectrometer

Item No.: 4-0-0-2

This gas chromatography-mass spectrometer is able to determine the composition of complex mixtures by taking advantage of the column's efficient separation capabilities and accurate identification of mass spectrometry units. It is the best instrument for precision analysis and testing in the laboratory.

INQUIRY

Description

Principle of Gas Chromatography-Mass Spectrometer
1. The structure of the gas chromatography-mass spectrometer is shown on the right:
A — Gas cylinder, gas with pressure (carrier gas)
B — Pressure regulating valve

C — Micro syringe
D — Sample inlet
E1 — Focus voltage
E1＋E2 — Acceleration voltage
F — Column
4*G — Quadrupole
H — Source of ionization
J1 — Focusing electrode
J2 — Acceleration electrode
J3 — Lead electrode
K1 — Focusing lens
K2 — Ion detector
M — Data processor and computer workstation
N — Ion current amplifier
S1 — DC voltage
S2 — High frequency voltage
T1, T2 — Vacuum tube
Y1 — Chromatogram
Y2 — Image of the mass spectrum
2. Working Principle of Chromatographic Column
The instrument uses a gas as the mobile phase (carrier gas). When the sample is injected by the micro syringe (C) and enters the sample inlet (D), carried by the carrier gas into the capillary column (F). Due to the difference of coefficient in distribution or adsorption between the mobile phase (gas phase) and the stationary phase (liquid phase or solid phase) of each component in the sample, under the flushing of the carrier gas, the components are repeatedly distributed between the two phases (mobile phase and stationary phase) to separate the components in the column (F).
3. Working Principle of Mass Spectrometry Unit
Mass spectrometry is an analytical method that measures the ratio of the charge and mass of ion of a sample. For the normal operation of the mass spectrometer, it is necessary to form a vacuum chamber of the high vacuum system. The instrument uses a two-stage vacuum pump, the front stage is a general vacuum pump, and the latter stage is a high-performance turbo molecular pump, which constitutes a two-stage vacuum unit to ensure the required vacuum.
After the components in the sample are separated by the capillary column, sequentially enters the Source of ionization (H) where they are ionized. Positively charged ions of different charge/mass ratios are generated to form an ion beam. The ion beam is fed into the quadrupole (4*G) system by the focus electrode (J1), the acceleration electrode (J2), the lead electrode (J3), and the focus lens (K1). A electric field of direct current and a high frequency are formed in the quadrupole under the combined action of a direct current voltage (S1) and a high frequency voltage (S2), which is referred to herein as a combined electric field. The direction of advancement of the ion beam is deviated by the action of the integrated electric field. Only ions that conform to the equation of the integrated electric field motion can reach the ion detector (K2) through the center of symmetry of the quadrupole (4*G). These ions are then amplified by an ion current amplifier (N) to produce a mass spectral signal. The mass spectral signal is processed by the data processor and computer workstation (M) and converted into the image of the mass spectrum (Y2).
We can compare the mass spectrum of the obtained sample with the mass spectrogram in the mass spectrometer to identify the composition of the sample. We can compare the mass spectrum of the obtained sample with the mass spectrogram in the mass spectrogram library to identify the composition of the sample.

Features of GC-MS 68 Gas Chromatography-Mass Spectrometer
Hardware
•Electronic pressure/flow control system (EPC/EFC) for self-developed GC 6800 system;
•Patented EI filament set provides highly efficient electron emission, a maximum of 350μA;
•Quality mass analyzer with pre-filter reduces quadrupole pollution;
•High-energy dynode electron multiplier ensures good sensitivity；
•Vacuum system with quality mechanical and turbo molecular pumps guarantees stability and reliability；
•Full scale gauges monitor vacuum states in real time;
•Self protection system guarantees safety of operators and core parts under abnormal conditions;
•RF power supply digital compensation technology ensures better sensitivity and resolution in full mass range.
Software
•The software “ChemAnalyst” controls auto sampler (AS), gas chromatograph (GC) and mass spectrometer (MS); data are acquired and transferred by high-speed network card;
•Full Scan and selective Ion Monitoring (SIM) modes are available;
•The system supports manual and automatic tuning, display of total ion current (TIC) and mass chromatogram (MC);
•Manufacturer of the GC-MS 68 is a legal distributor authorized by NIST/EPA/NIH in China mainland, which guarantees the latest version and free online upgrade of NIST (current version NIST 2011).
•The data processing section searches target compounds in NIST 2011 based on mass spectra of samples, displays search results which include retention times, structural formula and standard mass spectra, and compares the abundances of standard and real target ions. Users can make accurate qualitative and quantitative analyses;
•Superior quality: it uses high-end core parts, which ensures GC-MS 68 high quality.
•Meeting high demands: The necessary parts can be provided in time, and meets multiple requirements from clients in different fields;
•User-friendly design: it facilitates easy operation and convenient maintenance;
•High-efficiency ionization source: modularization design, advanced technology, having high ionization efficiency, and enhancing sensitivity;
•ChemAnalyst software: convenient operation, data acquisition and processing;
•Highly cost-effective: offering more benefits while meeting all application demands;
•Scientific solutions: We offer customers perfectly customized solutions;
•Consumables with favorable price: most consumables and parts are self-developed, which save a lot of maintenance cost, while providing high performance;

Parameters of GC-MS 68 Gas Chromatography-Mass Spectrometer
Parameters of GC
•Inlet temperature: Max. 450℃
•Pressure range: 0-100psi,±0.002psi
•Pressure control mode: Electronic pressure control (EPC), support CV and CC
•Split mode: Split/splitless, max. split ratio: 1000:1
•Column oven working temperature: Room temperature+4℃～450℃
•Heating rate: Up to 120℃/min
•Temperature programming: 7 stages/ 8 platforms
•Auto Sampler: Optional
Parameters of MS
•EI source ionization energy: 5 eV ---250 eV (Adjustable)
•Mass range: 1.5- 1000amu
•Resolution: Unit resolution (full width at half maximum)
•Ion source temperature: 100—350℃
•Filament emission current: 0-350 μA
•GC-MS Interface Temperature: Max. 450℃
•Stability: ±0.10 amu/48 hrs
•Sensitivity: Full scan, 1pg OFN at m/z 272 with S/N ≥30：1 (RMS)
•Scan rate: Up to 10000 amu/s
•Vacuum: Turbo molecular pump（67 L/s）
•Detector: High-energy dynode electron multiplier

Description:
•If the equipment performances and parameters required by the customer are beyond the scope of this introduction, please ask for it, we can introduce specifically.
•If the customer has other needs, please tell us, maybe we will give you a satisfactory answer.
•The Product descriptions may be modified at any time without notice.
•The final performance and parameters of the product are determined by the contract signed by the customer at the time of order.

Precision machining center in the workshop
Gas chromatography-mass spectrometer 4

Before you decide to purchase the instrument, we recommend that you come to visit the production workshop and take a look at the precision machining equipment of the instrument. Bring you direct access to the source of production, more real understanding of product performance and ex-factory price. "If the manufacturer is good, you will know when you look at the production site."