Basic principles of gas chromatography:

Gas chromatography is a chromatographic separation analysis method that uses gas as a mobile phase. The vaporized sample is carried by the carrier gas (mobile phase) into the chromatographic column. The stationary phase in the column has different molecular forces from the components in the sample, and the time for each component to flow out of the chromatographic column is different, and the components are separated from each other. Using an appropriate identification and recording system, make a chromatogram that marks the time and concentration of each component flowing out of the chromatographic column. According to the peak time and sequence indicated in the figure, the compound can be qualitatively analyzed; according to the height and area of the peak, the compound can be quantitatively analyzed. It has the feather  of high efficiency, high sensitivity, strong selectivity, fast analysis speed, wide application, simple operation and so on. Suitable for qualitative and quantitative analysis of volatile organic compounds.

Application:
As long as the substance can be vaporized without decomposition under the conditions allowed by the gas chromatograph, it can be determined by gas chromatography. For some thermally unstable substances, or substances that are difficult to vaporize, through chemical  methods, gas chromatography can still be used for analysis. It has been widely used in petrochemical, medical and health, environmental monitoring, biochemistry, food testing and other fields

1. Application in sanitary inspection Air and water pollutants such as volatile organic compounds, polycyclic aromatic hydrocarbons, benzene, toluene, benzo(a) ratio, etc.; residual organochlorine and organophosphorus pesticides in crops; food additives, benzoic acid, etc.; biological materials such as body fluids and tissues Analysis such as amino acids, fatty acids, vitamins, etc.

2. Application in medical laboratory Analysis of biological materials such as body fluids and tissues: such as fatty acids, triglycerides, vitamins, sugars, etc.

3. Application in drug analysis Determination of volatile components in antiepileptic  drugs, Chinese patent medicines, and alkaloids, etc.

The basic composition of the instrument: Sampling system + chromatographic column + detector + chromatographic

Workstation software Sampling system: divided into capillary column sampling system and packed column sampling system

Chromatographic column: divided into packed column and capillary column.

Detector: FID (hydrogen flame) detector; TCD (thermal conductivity) detector; ECD (electron capture).detector; FPD (flame photometric) detector.

Chromatography workstation: divided into ordinary workstation and special version workstation.

FID Detecto: Volatile hydrocarbons (such as organic solvents, alcohols, esters, ketones, etc.)

TCD Detecto: Moisture, various gases, volatile organic compounds, etc.

ECD Detector: Halogenated hydrocarbon compounds (such as organochlorine pesticides, chloroform, carbon tetrachloride, etc)

FPD Detector: Sulfur-containing and phosphorus containing compounds (such as hydrogen sulfide, methyl phosphorus, etc.)

Technical features:
 The host has the memory and recall function of 20 sets of sample test methods    
 (In the past, we usually record the condition of the test sample in the sample map and output it to the electronic file. When the sample is to be remade, it must be manually input and adjusted according to the requirements of the sample test, especially in the gas circuit part. The workload is very large. Now just recall the previous storage directly, and the rest of the instrument will be completed automatically)

 Standard PC side reverse control software, built-in chromatographic workstation, achieve PC side reverse control and host touch screen same time double directional control. (GC112N only):
1.Host with 7-inch color touch screen, carrier/hydrogen/air channel flow (pressure) digital display.
2. Gas shortage alarm protection function; Heating control protection function (when opening the door of the column box, the motor of the column box fan and the heating system will shut down automatically).
3.Split flow/split ratio can be automatically controlled to save carrier gas.
4.Configure automatic sampler installation and positioning interface to match automatic sampler of various specifications.
5.The multi-core, 32-bit embedded hardware system ensures  the reliable operation of the instrument.
6.One-button start function, with 20 groups of sample test mode memory function.
7.Using logarithmic amplifier, detection signal no     cut-off value, good peak shape, extensible     same time external trigger function, can be started     by external signals (automatic sampler, thermal     analyzer, etc.) at the same time the host and workstation.
8. It has perfect system self-check function and fault    automatic identification function.
9. With 8 external event extension function interface,    can be selected with various function control valves,    and according to their own set time sequence work.
10.RS232 communication port and LAM network port,    and the configuration of data learn card. Column temperature box:
11.Content product: 22L
12.Temperature control range: 5ºC ~ 400ºC at room temperature.

Column temperature box:
1. Temperature control accuracy: ±0.1ºC
2. Heating rate: 0.1 ~ 60ºC / min
3. Program temperature rise  steps: 9
4. Program heating repeatability: ≤ 2%
5. Cooling way: open the door after
6. Cooling speed: ≤10 mins (250ºC ~ 50ºC) Control software function :(GC112N only)
7. Column temperature box control
8. Detector control
9. Injector control
10. Map display

Detector:
1.FID, TCD optional one
2.Temperature control range: room temperature 7 ºC - 420 ºC
3.Number of simultaneous installations: up to 2
4.Ignition function: automatic
5.Hydrogen flame ionization detector (FID):
6.Detection limit: ≤ 3 × 10-12 g / s (n-hexadecane)
7.Baseline noise: ≤ 5 × 10-14 A
8.Baseline drift: ≤ 6 × 10-13 A
9.Dynamic range: 107
10.RSD: ≤ 3%
11.Thermal Conductivity Detector (TCD):
 12.Sensitivity: 5000mV.ml / mg (n-hexadecane)
  13.Baseline noise: ≤ 0.05 mV
  14.Baseline drift: ≤ 0.15 mV / 30 min
  15.Dynamic range: 105
16. Power supply voltage: 220V ± 22V, 50Hz ± 0.5Hz
 17.Power: 3000W

Product Parameters

Column oven:

 
Sampler: