8 Questions
What is the primary advantage of using internal standard calibration over external standard calibration in gas liquid chromatography?
It corrects for fluctuations in injection volume and chromatographic conditions
What is the purpose of normalization calibration in gas liquid chromatography?
To determine the normalized response factors of other compounds relative to a reference compound
Which calibration method is the simplest to perform in gas liquid chromatography?
External standard calibration
What is the advantage of using multiple-point internal standard calibration over internal standard calibration?
It provides more accurate correction factors
What is the purpose of an autotuning function in quadrupole calibration?
To perform an automatic calibration using the internal mass of the quadrupole detector
Which calibration methods tend to provide the most accurate results in gas liquid chromatography?
Internal standard calibration and multiple-point internal standard calibration
What is the limitation of external standard calibration in gas liquid chromatography?
It does not correct for fluctuations in injection volume and chromatographic conditions
What is the primary factor in determining the best calibration method for gas liquid chromatography?
The specific needs of the application in terms of ease of use, accuracy, and reproducibility
Study Notes
Calibration Methods for Gas Liquid Chromatographs
- External Standard Calibration: A basic method that involves running multiple standard solutions with known concentrations to construct a calibration curve based on peak areas.
- Internal Standard Calibration: A method that corrects for fluctuations in injection volume and chromatographic conditions by adding an internal standard compound to both calibration standard solutions and sample solutions.
Advantages of Internal Standard Calibration
- Corrects for fluctuations in injection volume and chromatographic conditions
- Provides more accurate results
Multiple-Point Internal Standard Calibration
- Combines external standard and internal standard methods by using multiple concentrations of an internal standard
- Provides more accurate correction factors
Normalization Calibration
- Normalizes the response of the detector to that of a reference compound
- Determines the normalized response factors of other compounds relative to the reference compound
- Suitable for reproducible results
Quadrupole Calibration
- Uses an autotuning function built into the GC's control software
- Performs automatic calibration using the internal mass of the quadrupole detector
- Provides accurate mass calibration
Comparison of Calibration Methods
- Internal standard calibration and multiple-point internal standard calibration provide the most accurate results
- External standard calibration is the simplest to perform
- The best method depends on specific needs in terms of ease of use, accuracy, and reproducibility
This quiz covers the different methods used to calibrate gas liquid chromatographs, including external standard calibration and internal standard calibration.
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