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1. Samples to be analyzed (1) The composition and state of the sample itself, whether it is gaseous, liquid, solid or mixed, can it be directly analyzed by gas chromatography?
(2) The component to be tested is thermally unstable, easily decomposed, or easily catalyzed. Whether changes in time, temperature, pressure, etc. cause changes in the measured component;
(3) Whether there are soot, suspended matter, high Buddha point components and corrosive components in the sample. To consider how the sample is obtained, how to perform pretreatment of the sample;
(4) Is the sample source easy? Allowing the consumption of the sample is beneficial to the selection of the injection method;
(5) Components and approximate concentration ranges that are not required to be analyzed;
(6) The number of times the sample needs to be analyzed every day, the interval between two analyses;
2. What is the purpose of the analysis?
(1) Qualitative analysis: Is the analyzed component known or unknown, and is there a standard?
(2) Quantitative analysis: in that range - constant (10-1`~10-3); semi-micro (10-3~10-5); trace (10-5~10-7); trace (10-6~ 10-9) or super trace (≤10-9)
(3) Quantitative accuracy and analytical accuracy, if semi-quantitative requirements are much simpler.
3. Positioning of the purchasing unit 1. Research institutes - high requirements;
2. Monitoring and Analysis Center - accurate and reliable;
3.* On-site analysis of the line - repeated reproduction;
4. The same sample, in theory, may be useful in a variety of instrumental analysis methods, from the instrument's performance / price ratio, operating characteristics, maintenance services, multi-party comparison, list the reasons for the choice of gas chromatograph analysis.
5. Consult the national standard, line standard, enterprise standard or foreign related reference materials for the presence or absence of the sample to be analyzed. If yes, the function and technical requirements of the instrument should be given in the standard.
6. There are analysts who do similar samples around the work unit. If there is any choice for the selection and later establishment of chromatographic analysis methods;
7 Collect samples and materials of various types of gas chromatographs (including accessories), and prepare basic preparations for the final selection of zui;
8 tasks are long-term? Still short-term? What kind of instrument is used to decide how much to invest depending on the task? Do you want to make long-term plans?
9 What are the current conditions? There are many units for a new analytical task. The existing instruments are properly modified and re-established analytical methods, which are fully qualified for the job; if the conditions are met, there is no reason to make a large investment to purchase new instruments and equipment;
10 Considering the working efficiency, operating cost, and manpower (technical level) of the selected instruments and equipment, it is difficult to select those so-called high, fine and sharp products. In short, the main focus is on the economy.
11. The chromatographic data processing device is the necessary equipment for the end of the analysis results. It should be purchased according to the specific requirements of the type and format of the information required for the analysis. Do not consider the financial resources, but choose those prices and over-capacity. Chromatography workstation. Some sample components are small, well separated, with thousands of yuan of recorders, chromatographic data processing machine to do the work, why spend tens of thousands of dollars to buy a computer that is not efficient, time-consuming computer processing data?
12. Use occasions and instrument installation location:
Although the gas chromatograph is not critical to the installation position of the optical instrument, the following conditions should be observed when operating certain detectors and high sensitivity:
(1) Use occasions: temperature, humidity, atmospheric pressure, vibration, electromagnetic interference, presence or absence of corrosive gases, ventilation, stray light, water, dust, etc. may affect the operation of the instrument;
(2) The instrument installation base is stable and earthquake-resistant, the size of the area, the location, and the maintenance is convenient;
(3) Whether the gas source supply method, installation operation, purity, etc. can meet the requirements.
How to choose a gas chromatograph
For example, from the laboratory gas chromatograph, there are no more than one hundred types and models of domestic products. The technical performance, functional characteristics, price and operating characteristics of different products vary greatly. In addition, the analyzed samples are very strange, and the analysis purpose and requirements are different. For those chromatographic users who have not worked long hours and have little experience, they should be able to purchase a suitable performance/price ratio instrument according to their own needs. An easy task. In order to assist everyone, fast, good, and save a place to buy a chromatograph, now I will analyze how to choose a gas chromatograph for consideration.