structure
The headspace sampler is a sampler for the gas chromatograph. After starting, the sample is automatically heated according to the set value; injection; charging; sampling; sample filling into the quantitative tube; six-way valve switching injection; starting the workstation to start sampling data and so on.
Attachment: What is the headspace analysis method?
The headspace analysis measures the content of these components in the original sample by detecting the gas composition above the sample matrix. Obviously, this is an indirect analytical method based on the gas phase and liquid phase under certain conditions. There is a gas-liquid distribution equilibrium between the solid phase and the solid phase. Therefore, the composition of the gas phase can reflect the composition of the condensed phase (liquid phase), and this composition is fixed under other conditions. We can consider headspace analysis as a gas phase extraction method that uses gas as a "solvent" to extract volatile components from a sample. Therefore, headspace analysis is an ideal method for sample purification. Traditional liquid-liquid extraction. And SPE is to dissolve the sample in the liquid, inevitably there will be some co-extraction interference analysis. Moreover, the purity of the solvent itself is also a problem, which is especially important in trace analysis. Gas can be used as a solvent to avoid unnecessary Interference, because high-purity gas is easy to obtain, and the cost is low, which is also an important reason for the widespread adoption of headspace GC.
As an analytical method, the headspace sampling (device) analysis is simple. It only takes the gas phase for analysis, which greatly reduces the interference of the sample matrix on the analysis. As a sample processing method for GC analysis, headspace is the easiest. Secondly, the headspace injection analysis has different modes and can be adapted to various samples by optimizing the operating parameters. Third, the sensitivity of the headspace analysis can meet the requirements of the regulations. Finally, combined with the quantitative analysis capability of the GC, the headspace The injector and GC are fully capable of accurate quantitative analysis
Configuration
The HS-12D automatic headspace sampler is designed to facilitate the experimental requirements of more users. Beijing Huasheng Spectrum Instrument Co., Ltd. has developed a belt based on the HS-12A automatic headspace sampler. Headspace sampler with quantitative tube pressure balanced injection technique.
Features and main functions
1. Metal body heating and temperature control, high temperature control precision and small gradient;
2. The front sample area, the user is more convenient to operate when placing samples and sampling;
3. Microcomputer program control, the main functions are:
(1) Method parameter setting, real-time working status, and running time;
(2) The sample area, the injection valve system and the sample transfer tube, all of which are separately heated and controlled;
(3) Set the control program and press the run key to automatically complete the entire sample analysis;
(4) It can store 9 methods, which is convenient to call at any time, and realizes quick start and analysis;
(5) The GC and chromatographic data processing workstations can be started simultaneously, and the device can also be started by a foreign program;
4. With external loading gas adjustment system, headspace injection analysis can be performed without any modification or change to the GC instrument. The original instrument carrier gas can also be selected;
5. Through the time programming, automatic anti-blowing and other functions such as pressurization, sampling, injection, analysis and analysis;
6. Using pressure balance plus quantitative tube injection technology;
7. The sample transfer tube and injection valve have automatic backflushing function to avoid cross contamination of different samples;
8. In order to make the imported gas chromatograph more convenient and accurate to use, the instrument is also equipped with a special interface for various imported instruments, which is convenient to connect;
9. For the active substance analysis, an optional elastic quartz tube can be selected as the sample transfer tube;
10. The needle can be easily replaced, and it can be connected to all types of GC inlets at home and abroad.
The main technical parameters
1. Sample area temperature control range:
Room temperature - 220 ° C in increments of 1 ° C set heating power of about 400 W;
2. Valve injection system temperature control range:
Room temperature - 180 ° C in increments of 1 ° C, the heating power is about 60 W;
3. Sample transfer line temperature control range:
Room temperature - 200 ° C in increments of 1 ° C, the heating power is about 40 W;
(For operational safety, the transfer line temperature control is powered by low voltage)
4. Temperature control accuracy: < ±0.5 °C;
5. Temperature control gradient: < ±0.5 °C;
6. Headspace bottle station: 12;
7. Headspace bottle specifications: optional 20ml, 10ml (50ml and other specifications can be customized);
8. Repeatability: RSD ≤ 1.5% (200ppm ethanol in water, N=5);
9. Injection volume (quantification tube): 1ml (optional 2ml, 5ml);
10. Injection pressure range: 0 ~ 0.4Mpa (continuously adjustable);
11. Backflush cleaning flow: 0 ~ 400ml / min (continuously adjustable);
12. Effective size of the instrument: 400 × 200 × 380mm3;
13. Instrument weight: approx. 15 kg.
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