AHS-6890AHeadspace injectionimplement
1summary
AHS-6890AHeadspace injectionimplementIt's BeijingZhongyi Yusheng Technology Co., LtdThe company has newly developed and launched a new type of gas chromatograph sample pretreatment equipment.
We know that gas chromatography has significant errors in daily analysis processes10% comes from the instrument being operated, while 90% comes from the quality of sample pretreatment. The advantages and disadvantages of different sample pretreatment techniques and methods vary greatly. Among them, if headspace injection (gas phase extraction) gas chromatography analysis is used, it can achieve accurate, simple, and rapid analysis of volatile compounds in almost any sample. Because headspace sampling makes it extremely easy to achieve solvent-free extraction of liquid and solid samples, it can be said to fundamentally eliminate errors and problems that may occur in sample pretreatment methods such as adsorption desorption and solvent extraction.
Generally speaking, the headspace injection gas chromatography analysis method has the following advantages compared to direct injection, solvent extraction, and adsorption desorption injection methods:
1. Accurate, simple, fast, convenient, automatic, and environmentally friendly;
2. High sensitivity analysis of volatile components in samples;
3. As high boiling point components are not introduced into GC, analysis time can be shortened and work efficiency can be doubled;
4. As high boiling point components are not introduced into the GC, it avoids contamination of the analysis system by high boiling point components, thereby reducing the daily maintenance work of the instrument and extending the life of certain key components (such as injectors, chromatography columns, detectors, etc.);
At present, there are several major application areas and examples of headspace injection gas chromatography analysis at home and abroad:
1. Petrochemical industry: high polymer monomer coatings, volatile organic compounds, etc;
2. Environmental science: volatile halogenated hydrocarbons in drinking water and organic toxic volatile compounds in industrial wastewater;
3. Hygiene and epidemic prevention: analysis of residual disinfection and fumigation of medical supplies;
4. Food industry: quality control of colored wine, vinegar, soy sauce, residual acetaldehyde in packaging materials, and residual 6 # solvent in extracted oil;
5. Spice essence: flavor analysis of beer and tea;
6. Quality inspection of drugs: organic residual solvents in drugs;
7. Forensic chemistry: determination of ethanol, ketones, and aldehydes in blood and urine;
8. Other: such as volatile organic compounds in soil.
2、 InstrumentCharacteristics and main functions
1. Integrated design, compact structure, easy to operate;
2. Heating and temperature control of metal isothermal body, with high temperature control accuracy, small gradient, and high temperaturestableGood performance, simple and reliable, reducing various drawbacks that may be caused by constant temperature heating in oil baths;
3. Microcomputer control, LCD Chinese character display, membrane keyboard, numerical input, main functions include:
⑴ LCD can display: method parameter settings, real-time working status, running time, year, month, day, hour, etc. at a glance;
⑵ Headspace vial, injectionvalveSystem and Sampling (Injection)transmissionManage, all three channelsaloneHeating and temperature control;
⑶ Three external affairs, 8-level time program control, running self start and self stop;
⑷ It has 9 methods for editing, storing, and calling at any time, achieving fast startup and analysis;
⑸ The GC and chromatographic data processing workstations can be synchronously started, and the device can also be started using external event programs;
4. Equipped with an external carrier gas regulation system, there is no need forAny modifications or changes to the GC instrument can be used for headspace injection analysis，Also optionalUse the original instrument carrier gas;
5. Automatically achieve pressurization, sampling, injection, analysis, and post analysis blowback through time programmingcleanOther functions;
6. Using pressure equilibrium injection technology for headspace injectionNarrow peak shape and good repeatability；
7. Sample transmissiontransportPipeAnd the injection valveThere is an automatic blowback function, which avoids cross sampling of different samplessewageDyeing;
8. In order to complement importsGC is more convenient and accurate to use, and this instrument is also equipped with dedicated interfaces for various imported instruments, making it easy to connect;
9. For active substance analysis, an elastic quartz tube can be selected as the sample transfer tube;
10.canAdjust the injection volume at any time according to the concentration of the sample to be analyzed by the customer;
11.The injection needle is easy to replace and can be connected to all models at home and abroadGCInjection port;
12.Easy to achieve multiple repeated injections of the same sample bottle, facilitating the development and research of methods.
3、 InstrumentMain technologiesparameter
1. Temperature control range in the sample area:
room temperature—350℃ can be set in increments of 1 ℃ Heating power approximately400W；
2. Temperature control range of valve injection system:
room temperature—18Heating power of approximately 60W is set at 0 ℃ in increments of 1 ℃;
3. Temperature control range of sample transfer pipeline:
room temperature—200The heating power is approximately 40W with an increment of 1 ℃;
4. Temperature control accuracy:< ±0.5℃；
5. Temperature control gradient:< ±0.5℃；
6. Headspace bottle workstation:9;
7. Headspace bottle specifications: Optional20ml 、10ml（50mlAnd otherSpecifications can be customized);
8. Repeatability:RSD < 1.5%（200ppm ethanol in water, N=5）；
9. Injection volume control mode: InjectiontimeAnd pressurized pressureControl the injection volume；
10. Injection pressure range:0-0.4Mpa (continuously adjustable);
11. Backblowing cleaning flow rate:0~200ml/Min (continuously adjustable);
12. Effective size of the instrument:400×180×360mm3；
13. Weight of the instrument: approximately12 kg.
