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气相色谱六通阀气体进样技巧
气相色谱六通阀气体进样技巧 详细信息：

在气相色谱法,库仑法仪器分析中,气体进样操作不当是定量分析误差的主要来源之一.进样系统的原理,结构,使用的材料,进样时的温度,进样量,进样速度,进样用的工具都会对分析结果的重复性和准确性产生直接影响.以气相色谱气体分析为例说明常压气体进样时六通阀定体积进样的使用.

应用实例：环境空气/固定污染源废气中非甲烷总烃的测定

滕州市浩瀚色谱仪器技术服务有限公司，通过采用三通连接两个具有1.0m L定量环的六通阀,以双柱单FID检测器的气相色谱仪对环境中的非甲烷总烃进行测定。总烃的浓度扣除甲烷浓度和氧的干扰,即可得到非甲烷总烃的浓度,可以实现当次分析样品,得到包含总烃、甲烷的图谱,完成总烃、甲烷、非甲烷总烃浓度的测定。当进样体积为1.0m L时,总烃的检出限为:1.6×10-2mg/m3,甲烷的检出限为:1.3×10-2mg/m3。采用单FID检测器,单次注射样品,消除多次注射样品和双FID检测器因灵敏度差异引起的误差;同时,改进没有使用十通阀等复杂且并不常用的配件,充分利用了实验室现有的仪器条件,适合条件类似的实验室进行改进。


气相色谱六通阀气体进样技巧 图片及安装图纸：




Gas sampling technique with six-port valve for gas chromatography
Gas sampling technique with six-port valve for gas chromatography

Matters needing attention and some skills in the six-way valve sampling of atmospheric gas in gas chromatography.Appropriate application of these skills helps to ensure the accuracy and reproducibility of the analysis.


In gas chromatography and coulometric instrument analysis, improper gas sampling operation is one of the main sources of quantitative analysis errors. The principle, structure, materials used, temperature at the time of injection, sample volume, and sample injection Speed and the tools used for sample injection will have a direct impact on the repeatability and accuracy of the analysis results. Take gas chromatography gas analysis as an example to illustrate the use of six-way valve fixed-volume injection during atmospheric gas injection.

Application example: Determination of non-methane total hydrocarbons in ambient air/stationary pollution source exhaust gas

Tengzhou Haohan Chromatography Instrument Technology Service Co., Ltd. uses a three-way connection with two six-way valves with a 1.0 mL quantitative ring to determine the total non-methane hydrocarbons in the environment by a gas chromatograph with a double column and a single FID detector. The concentration of total hydrocarbons deducts the interference of methane concentration and oxygen, and the concentration of non-methane total hydrocarbons can be obtained, which can realize the current analysis of samples and obtain a map containing total hydrocarbons and methane, and complete the concentration of total hydrocarbons, methane, and non-methane total hydrocarbons. Determination. When the injection volume is 1.0ml, the detection limit of total hydrocarbons is 1.6×10-2mg/m3, and the detection limit of methane is 1.3×10-2mg/m3. Using single FID detector, single injection of samples, eliminating errors caused by multiple injection samples and dual FID detectors due to sensitivity differences; at the same time, the improvement does not use complicated and infrequent accessories such as ten-port valves, making full use of the laboratory The existing instrument conditions are suitable for improvement in laboratories with similar conditions.


Gas Chromatography Six-way Valve Gas Sampling Skills Pictures and installation drawings: