Gas chromatograph manufacturers, Wuhan Teterworth Technology Co., Ltd. specializes in the production of gas chromatographs, portable chromatographs, etc. In the operation of Wuhan Tetworth Technology Co., Ltd., efforts are being made to eliminate old ideas and backward models, accelerate the pace of individualization, and let our new generation of domestically-made reversed-phase gas chromatograph GC2030 be promoted to high-quality enterprises. More about For detailed introduction of gas chromatograph, please pay attention to Wuhan Tateworth Technology Co., Ltd. For a gas chromatograph, its performance is usually a direct impact on the product. Therefore, in order to achieve better quality, for the gas chromatograph, we must follow certain verification procedures. Only by fully guaranteeing the effective implementation of regulations and production analysis and other tasks can we achieve smoother progress. For instrument performance, scientific and effective verification can also be achieved. This article focuses on analyzing the aspects of the gas chromatograph application that should be noted. For modern instrument analysis, it is necessary to master reasonable and effective methods. In the process of using analytical techniques, it is not only trying to achieve high efficiency, but it should also be sufficiently fast and sensitive. It seeks to help the relevant personnel to fully determine the substance content through more accurate measurements. The chromatographic method can also play a role in separation, material purification, can be prepared by this device. Until now, it has been widely used and applied. In various samples, we want to know the specific composition of a certain substance, or the actual content, through the gas chromatograph, not only can maintain more accurate, but also faster. However, for a gas chromatograph, usually if it is used for a period of time, then for the instrument system, its corresponding performance is generally easy to keep away from technical standards. 1 How to fully implement the gas chromatograph verification 1.1 Continuously strengthen the control of baseline and other indicators For some gas chromatographs, only for gas samples. And in the process of actual operation, only low column temperature conditions are also selected. Some instrument operation stages, even need to keep room temperature, so as to achieve more effective operation. Generally speaking, at this time, in order to successfully perform the calibration of the column temperature, it is required to be less than the aging temperature. Based on this state, the temperature control accuracy can be fully measured, and the stability can be maintained. In the column system, there are generally more long-term retention components, or some corresponding impurities. As temperatures increase, they are likely to flow out, making it difficult to maintain good baseline stability. Loss may occur for low temperature stationary phases. The connection between the internal structures of the column system is relatively complicated. It will also be relatively difficult to replace the column. In the process of production control analysis, for some related requirements, it is also not allowed to change easily. Therefore, during the calibration of the column temperature, it is necessary to reasonably grasp the accuracy of temperature control. 1.2 Reasonable selection of carrier gas For different gases or carrier gases, the thermal conductivity also varies. In general, hydrogen and helium have relatively high thermal conductivity, which is far more than other substances. Hydrogen helium is usually selected as a carrier gas to ensure that the instrument under test can always have its proper sensitivity. In general, the carrier gas only maintains a relatively good purity, which can facilitate the instrument to be more sensitive. According to the actual characteristics of the carrier gas, if there is an increase in the flow rate, it is likely that the corresponding sensitivity will be reduced. Therefore, for the carrier gas flow, in order to achieve a reasonable choice, it is necessary to strive for the effective separation of the reference material and follow the situation. In general, if the relevant reference material is not sufficiently separated, the corresponding chromatographic peaks may have tailing. For the carrier gas flow rate, it should be appropriately reduced. If the separation process is relatively slow, the actual flow rate of the carrier gas needs to be appropriately increased. However, if the flow rate of carrier gas increases, it may not be able to achieve good sensitivity for the instrument. Therefore, the carrier gas flow should also be carefully selected. The separation of the standard substances shall be followed, and the organic determination shall be made according to the actual conditions. For the reference material, if it is not separated and we observe significant peaks by observing the chromatographic peaks, the flow rate should be reasonably reduced based on the conditions at that time. However, on the contrary, if the separation process is slow, the flow rate should be appropriately increased according to the actual situation. 1.3 In order to avoid shift errors, it is necessary to strengthen the verification in this area. At present, the integrator is developing rapidly. For gas chromatographs, the attenuators above them are becoming increasingly rare. Some instruments continue to be designed and developed and do not even have this part. There are many instruments and Range is selected for operation. Under Range, the corresponding response value of each block will also be different during the operation. Between each different gear, there will be a difference of ten times. The corresponding high gear has full signal output characteristics, and then in accordance with a certain order, there will be a reduction of ten times. Part of the chromatographic measurement instrument in the actual operation process, with the characteristics of measurable voltage. For the signal output, we can measure the voltage effectively by adjusting the different gears through scientific and effective connection. 1.4 For the oven, it should also fully guarantee the temperature and pressure stability For the gas chromatographic analysis, it is necessary to reasonably control the temperature and pressure during the actual development. On the one hand, analysis of speed can be fully guaranteed. On the other hand, for a sample, a relatively good degree of separation can be achieved and the result can be more accurate. In order to understand temperature fluctuations, we generally use an absolute representation, which is not only accurate, but also very clear. 1.5 For the detector, it should also pay attention to strengthen the performance of the test Some gas chromatographs are capable of outputting signals directly and transferring them to computers, enabling scientific and effective data processing. For such instruments, some technical restrictions are usually required. For its existing signals, after many scientific and effective sampling, and after certain treatment, it can finally be formed. So its baseline noise is relatively low. At this stage of instrument operation, we need to fully grasp its detection limit. 2 Precautions for performing gas chromatographic verification phase First, if it is a multi-dimensional system, usually in order to not affect the analysis, all tasks are successfully completed. For column systems, etc., removal should be avoided as much as possible. The relevant column system can realize more effective connection without leak detection. Second, with respect to detectors, in order to fully protect their good performance, effective verification is required on a regular basis. Toluene should be selected not only in accordance with the characteristics of the cryogenic column, but also in the specific application process, in terms of peak time, it will be relatively faster. Third, there are signals about the need for reasonable acquisition. There are actually more significant differences between data acquisition systems, and this requires a great deal of attention. In the actual calculation, it should be fully corrected. The detector has good sensitivity during operation. This article focuses on analyzing the aspects of the gas chromatograph application that should be noted. In the process of using analytical techniques, it is not only trying to achieve high efficiency, but it should also be sufficiently fast and sensitive. At the metrological verification stage, the principle of the instrument and what kind of performance it possesses should be mastered. Familiar with how to operate the instrument, how to set the parameters. Only in this way can we accurately judge once problems arise.
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Problems to be noted in the verification of gas chromatograph
February 17, 2024