Matters needing attention in the use of gas chromatograph
Gas chromatograph is a kind of chromatographic analysis instrument. Gas chromatograph has been widely used in various fields in recent years, and it has good applications in petroleum, chemical, medical and health, food industry and other industries. In the use of gas chromatograph, users will encounter various problems. These problems come from the product quality of gas chromatograph on the one hand, and on the other hand, the use of gas chromatograph is a kind of chromatographic analysis instrument. In recent years, the instrument has been widely used in various fields, and has good applications in petroleum, chemical, medical and health, food industry and other industries. In the use of gas chromatographs, users will encounter various problems. These problems come from the quality of the gas chromatograph on the one hand, and on the other hand, whether the environment of the instrument is good or not is closely related to the proper operation of the operator. . 1. Environmental conditions The temperature requirement of the environment in which the gas chromatograph is used is not harsh, and it can operate normally at room temperature of 5-35℃. However, the humidity of the laboratory environment where the gas chromatograph is placed is generally controlled at 20%~85%. In areas with relatively high humidity, when using a gas chromatograph equipped with a hydrogen flame ionization detector, excessive humidity will cause the amplifier's insulation performance to decline. If it is operated in a high-sensitivity block, the response value of the instrument will decrease. Therefore, if the operator of the gas chromatograph encounters the above phenomenon when using the instrument, he can take corresponding measures. 2. Gas purity The use of gas chromatograph needs to be equipped with corresponding carrier gas, and the purity of the gas source used needs to be more than 99.99%. Different detectors have different requirements for the purity of different gas sources. As an operator of a gas chromatograph, sufficient attention should be paid to the purity of the gas. During the use of the instrument, the detection limit of the detector may be high and the baseline may be unstable due to insufficient purity of the gas source. If the purity of the carrier gas is not high and contains trace amounts of oxygen, the service life of the capillary column may be shortened. 3. The selection of air flow ratio. For example, for a gas chromatograph equipped with a hydrogen flame ionization detector, an N2-H2-Air flame is required. After ignition, it should be an oxygen-enriched flame, that is, the air should be excessive to ensure complete combustion of hydrogen. , The best ratio of the three gases is N2: H2 u003d 1: (0.85~1), Air: H2u003d (6~8): 1 or more air volume. Under this condition, the detector has high sensitivity and good stability, and the quantitative correction factor made is reliable. The above are the precautions in the use of gas chromatograph provided by the editor. You can use the above content as a reference. If the gas chromatograph fails in normal use, first check the relevant experimental environment. On the one hand, it is beneficial to the instrument. Routine maintenance, the other party can reduce unnecessary gas chromatograph maintenance costs. The introduction of gas chromatograph is here, welcome to buy online on 51gk
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