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    Gas Chromatography (GC)

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    Delivery time: 1 ~ 2 weeks

    Introduction

    Introduction

    Introduction

    Gas chromatography (GC) is a laboratory technique used to separate, identify, and quantify compounds in a mixture that can be vaporized. It works by passing a sample through a column with a stationary phase, while an inert gas carries the sample through. Different compounds travel at various speeds, allowing them to be separated and detected, often using devices like flame ionization detectors or mass spectrometers.

    Key Feature

    • Separation Efficiency: GC provides high resolution and effective separation of complex mixtures based on volatility and interaction with the stationary phase.
    • Sensitivity: Detects trace components down to parts per billion (ppb) or lower.
    • Speed & Efficiency: Analyses are typically fast (minutes to tens of minutes).
    • Wide Applicability: Ideal for volatile/semi-volatile organics in fuels, environmental samples, flavors, fragrances, forensics, and pharmaceuticals.
    Principle

    Principle

    Principle

    The fundamental principle of GC is based on the differing partitioning behaviors of substances between a mobile phase (gas) and a stationary phase (solid or liquid). In GC, a sample mixture is introduced into a chromatographic column, where the components interact with the stationary phase to varying degrees. These differences in adsorption affinity cause the components to travel through the column at different rates, resulting in their separation. The separated components are then detected and recorded by a detector. GC is widely used for the quantitative analysis of complex mixtures containing small-molecular-weight compounds.

    • Inconsistent sample injection, leading to large deviations.
    • Peak shifting caused by changes in other peak shapes.
    • Baseline interference.
    • Changes in instrument system parameter settings; parameters should be standardized and regulated.
    • Changes in chromatographic column performance.

    • Injector temperature is too high.
    • The column head is uneven; use diamond sand to cut it flat.
    • The polarity of the stationary phase does not match the sample; use a compatible column.
    • Cold spots exist in the sample flow path; eliminate areas with excessively low temperatures.
    • Injection time is too long.
    • Split ratio is too low; increase the split ratio (at least greater than 20:1).
    • Injection volume is too high; reduce the injection volume or dilute the sample.

    • Improper column installation.
    • Sample injection leakage.
    • High injection volume; increase vaporization temperature.
    • Low split ratio; increase the split ratio.
    • Low column temperature.

    Application

    Applicable industries

    Applicable industries

    Applicable materials type

    • Volatile organic compounds (VOCs): Such as solvents, alcohols, hydrocarbons, and aromatics.
    • Gases: Including air pollutants, natural gas components, and industrial gases.
    • Small-molecular-weight substances: Like pesticides, flavors, fragrances, and some drugs.
    • Thermally stable compounds: Substances that do not break down at the temperatures used in GC.
    Applicable materials type

    Applicable materials type

    Industrial Application

    • Petrochemical Industry: fuels, natural gas, and lubricants, ensuring product quality and process optimization.
    • Environmental Monitoring: detects and quantifies pollutants such as volatile organic compounds (VOCs) in air, water, and soil samples for regulatory compliance and environmental protection.
    • Food and Beverage Industry: flavors, fragrances, additives, and contaminants, supporting quality control and food safety.
    • Pharmaceutical Industry: analyzes raw materials, monitors impurities, and verifies the purity of pharmaceutical products during manufacturing and quality assurance.
    • Chemical Industry: quality control, process monitoring, and the analysis of complex chemical mixtures in various chemical manufacturing processes.
    Heat treatment: Carburizing

    Heat treatment: Carburizing

    Typical GC Graph Analysis

    • Liquid or Powder Samples: Whenever possible, place liquid or powder samples in a 1.5 mL sample vial.
    • Gas Samples: Collect gas samples in a 200 mL gas sampling bag.
    • Water-Based Samples: GC generally cannot analyze water-based solvents directly. Extraction is required.
    • Note: Please specify the extraction reagent used, or submit the sample after extraction.
    Test Procedure

    Test Procedure

    Test Procedure

    • Sample Preparation: The sample is prepared, often by dilution or filtration, to ensure it is suitable for injection and can be vaporized without decomposition.
    • Instrument Setup: The GC instrument is set up by selecting the appropriate column, stationary phase, carrier gas (mobile phase), and detector. The temperature program and flow rates are also configured.
    • Sample Injection: A small amount of the prepared sample is injected into the injection port, where it is vaporized and carried into the column by the carrier gas.
    • Separation in the Column: As the sample travels through the column, its components interact differently with the stationary phase, causing them to separate based on their volatility and affinity.
    • Detection: The separated components exit the column at different times and are detected by a detector, such as a flame ionization detector (FID) or mass spectrometer (MS).
    • Data Analysis: The detector produces a chromatogram, which displays peaks corresponding to different components. The retention time and peak area are used to identify and quantify the compounds present in the sample.

    Comparison between GC and GCMS

    AspectGas Chromatography (GC)Gas Chromatography-Mass Spectrometry (GC-MS)
    PrincipleSeparates volatile compounds based on volatility and interaction with stationary phaseCombines GC separation with mass spectrometry for identification
    DetectionUses detectors like FID or TCD; provides quantitative dataUses mass spectrometer; provides both quantitative and structural data
    IdentificationCan separate and quantify, but limited in identifying unknownsCan separate, quantify, and accurately identify compounds using mass spectra
    Sensitivity/SpecificitySensitive for known compounds; limited for complex/unknown samplesHigher sensitivity and specificity; ideal for trace and unknown analysis
    ApplicationsRoutine analysis, quality control, known compound mixturesForensics, environmental monitoring, drug testing, research, complex mixtures

    Gas chromatography (GC) is an analytical technique used to separate and analyze vaporized compounds. It involves passing a sample through a column with a stationary phase while an inert gas acts as the mobile phase. Components are separated based on their volatility and affinity, and detected by devices like flame ionization detectors or mass spectrometers. GC is widely used in fields such as environmental monitoring, food analysis, and pharmaceuticals for its sensitivity and speed.