What are the advantages of gas phase injection vials?

The gas-phase sample bottle is an important part of introducing the sample into the gas-phase system, and it is also the place where the sample is vaporized. Therefore, the inlet temperature is based on the principle of ensuring the effective vaporization of the liquid analyte, and do not pursue an excessively high temperature.
The principle of gas-phase injection vial technology is to place a liquid sample or solid sample in a closed glass injection vial, and keep more than half of the gas space above the sample in the gas-phase injection vial, and make the two samples at a constant temperature. After the phases reach equilibrium, the headspace gas in the sampling bottle is directly drawn and injected into the gas chromatograph for chromatographic separation and determination. The septum of the injection port is generally silicone rubber, its function is to prevent air leakage.
　　Characteristics of gas sample bottle
　　 Compared with manual sampling, the advantages of gas-phase injection vial sampling are that the injection volume can be reproduced, and automatic analysis can be realized, which reduces the labor intensity of analysts and improves work efficiency.
　　1. Variable injection speed: different injection speeds can be set according to the sample. Fast injection can eliminate the discriminatory reaction of the needle tip and improve the reproducibility of injection; slow injection can ensure effective injection of high-viscosity samples.
2. Wide range of injection volume: 5ul, 10ul, 25ul, 50ul and 100ul syringes can be used, and the injection volume is variable from 0.5ul to 50ul. Large-volume injection is possible, so that the concentration range of samples that can be directly analyzed is wide Expansion, generally do not need to pre-concentrate or dilute the sample. When the micro sample bottle is used, the total sample volume of 10ul, and the gas-phase sample bottle can successfully carry out 8 consecutive 1ul injections.
　　3. Suitable for multiple injection modes: such as split/splitless injection, multiple injection injection (large volume injection), etc., and can be set to automatically clean the syringe with two solvents.
　　4. Variable sampling depth: that is, the syringe can take samples close to the bottom of the injection bottle, or it can take samples 30mm above the bottom of the bottle. The advantages brought by this are: ①The sample can be placed in a sample bottle for extraction, and then set which layer of liquid to sample from; ②It can be used for microanalysis, which can control the amount of sample drawn.
　　5. Priority sampling function: In an automatic series analysis of the gas chromatograph, samples that need to be analyzed immediately or analyzed at a certain time can be inserted at any time without affecting the operation of the original sequence.
　　The specification of the gas injection bottle is 11.6*32mm. The opening of this series is 40% larger than that of standard small-caliber bottles. The unique thread design ensures consistent sealing. The bottleneck is processed to facilitate the handling of the robot arm. The strict quality guarantees the consistency of the size between batches and is uniformly balanced. The flat bottom ensures the compatibility with the inner cannula, and the ceramic writing board is convenient for marking.
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