Open Tubular Column Chromatography
2.Chromatographic Column (Rotation Type)
3.Chromatographic Column (Manual)
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Description
Technical Parameters
Open Tubular Chromatography, also known as Capillary Column Chromatography, is an advanced chromatographic separation technique. This technique uses a hollow capillary column coated with a fixed phase to separate components, which has the advantages of high separation efficiency, fast analysis speed and less sample consumption.
The internal diameter of a capillary column is usually between 0.20.8 mm and 10,300 m in length. The fixed solution is applied directly to the inner wall, so that the movement of the transported gas and sample molecules is not restricted, thereby improving the solute transfer rate between the two phases and the column efficiency, while avoiding vortex diffusion.
Parameter
Limitations
| ◆ Small column capacity The smaller inner diameter of the capillary column results in a relatively small column capacity. This means that a limited number of samples can be processed per analysis, and multiple samples may be required or split injection techniques may be used, increasing the complexity and time cost of the analysis. ◆ High requirements for sampling technology Due to the small column capacity, the requirements for injection techniques are more precise. Imprecise injection can result in sample overload, which can affect the separation effect and peak shape. ◆ Precise carrier gas flow rate control Capillary column chromatography requires precise control of carrier gas flow rates to ensure effective sample separation in the column. The instability of carrier gas flow rate may lead to poor separation effect or peak shape distortion. ◆ Detector sensitivity requirements are high Due to the small sample size, the sensitivity of the detector is required to be higher. Detectors with low sensitivity may not accurately detect trace components, affecting the accuracy of the analysis. |
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◆ Long analysis time Despite the high separation efficiency of capillary column chromatography, the analysis of complex samples can take a long time. This is mainly due to the need to optimize the separation conditions, perform multiple samples or use longer columns to improve the separation. ◆ Sample pretreatment is complicated Some samples may require complex pre-treatment steps, such as derivatization, extraction, etc., to be suitable for capillary column chromatography. This adds complexity and cost to the analysis. ◆ Limited applicability to certain types of samples Capillary column chromatography may not be suitable for certain types of samples, such as compounds with high boiling points, low volatilization, or heat instability. These compounds may break down or fail to vaporize effectively during analysis, affecting the separation and detection results. |
Application
► Petroleum and chemical industries
a. Diesel oil hydrocarbon analysis
1) Case description: In the laboratory, engineers use capillary columns such as DB-5ms general-purpose columns for hydrocarbon analysis of diesel samples. More than 100 kinds of hydrocarbons in diesel oil are effectively separated and detected by the detector through the programmed temperature.
2) Results: Benzene series, branched dodecane and bicyclic aromatic compounds were successfully isolated, which provided key data for the quality control of diesel oil.
b. Analysis of chlorinated hydrocarbons in chemical wastewater
3) Case description: In the treatment of chemical wastewater, the environmental monitoring Center chose PLOTQ porous layer open pipe string for separation in the face of complex chlorinated hydrocarbon mixture.
4) Results: Vinylchloride and 1, 2-dichloroethane were effectively separated on the PLOT column, and the retention time difference was significantly extended, which provided a strong support for accurately determining the concentration of chlorinated hydrocarbons in sewage.
► Food and agricultural products
a. Analysis of methyl alcohol and fusel oil in liquor
1) Case Description: PEG-20M capillary column and hydrogen flame ionization detector were used for quantitative analysis of methanol and fusel oil in liquor.
2) Results: The analysis results were in accordance with the national standard, which provided a scientific basis for the quality control of liquor.
b. Analysis of fatty acid components in olive oil
1) Case description: In the olive oil doping event, the inspector used a polar Wax column to analyze the fatty acid composition of the suspect sample. The fatty acids in the samples were converted to methyl ester by methyl ester treatment, and NIST library comparison was performed by GC-MS system.
2) Results: The low cost methyl palmitate was successfully detected, which provided strong evidence to combat the doping behavior of olive oil.
► Environmental and air quality monitoring
a. Analysis of volatile organic compounds in indoor air
1) Case Description: Benzene, toluene, xylene and total volatile organic compounds (TVOC) in indoor air were detected using a hydrogen flame ionization detector and a suitable capillary column.
2) Results: The results were accurate and reliable, which provided scientific basis for indoor air quality monitoring.
b. Concentration and analysis of atmospheric organic pollutants
1) Case description: Concentration and analysis of organic pollutants in the atmosphere using non-polar capillary chromatography columns such as SE-54/52 or DB-1.
2) Results: Various organic pollutants in the atmosphere were enriched and analyzed successfully, which provided important data for the assessment of atmospheric environmental quality.
► Other fields
1) Natural organic matter analysis: Capillary column chromatography can be used to analyze natural organic matter, such as plant essential oils, spices, etc., to understand its composition and properties.
2) Inorganic and metallic organics analysis: Although mainly used for organics analysis, capillary column chromatography can also be used for the analysis of inorganic and metallic organics under certain conditions.
cautions
| ◆ Sample handling and sampling 1) Sample dissolution and filtration: The sample should be dissolved in a suitable solvent to ensure complete dissolution and no precipitation. The dissolved sample should be filtered to remove impurities and avoid contamination of the capillary column. 2) Avoid corrosive samples: Do not use samples that are corrosive to the capillary column to avoid damaging the column. 3) Sample volume control: Too much injection may lead to column blockage, and too little injection may lead to peak deformation. According to the concentration of the sample and the target analysis results, the appropriate injection volume is selected. 4) Bubble avoidance: Sample injection should avoid bubbles, bubbles will affect the analysis results. |
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◆ Instrument operation and condition setting 1) Instrument connection check: Before operating the gas chromatograph, ensure that the instrument is connected properly and there are no leaks. 2) Capillary column connection: Take care to use the correct capillary column connection and ensure that the connection is well sealed. 3) Analysis condition setting: Ensure that analysis conditions such as column temperature and carrier gas flow rate are appropriate to avoid overload operation. Too high column temperature may lead to column damage, and too low column temperature may lead to incomplete separation. 4) Carrier gas purification: If the carrier gas contains dust or other particles, it will cause rapid damage to the capillary column, so the carrier gas needs to be purified before entering the gas chromatograph line. |
Future development trend of open column chromatography
With the continuous progress of science and technology, open column chromatography is also constantly innovating and developing. Here are some future trends:
► Improve separation efficiency
The separation efficiency of open column chromatography was further improved by optimizing column materials and improving separation conditions. This will enable the efficient separation of more complex samples.
New stationary and mobile phase materials were developed to improve the interaction strength and transfer rate of solute between the two phases.
► Expand the scope of application
Open column chromatography is applied to more fields, such as food safety, material science, etc. This will provide a powerful means of separation analysis for the research in these fields.
To meet the needs of specific fields, open column chromatography with specific separation functions is developed.
► Automation and intelligence
Through the introduction of automation and intelligent technology, the automatic operation and data processing of open column chromatography experiment are realized. This will improve experimental efficiency and accuracy and reduce human error.
Using artificial intelligence and machine learning technology, the experimental data is deeply mined and analyzed to find more valuable information.
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