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ASTM E355 Practice for Gas Chromatography Terms and Relationships
ASTM E355 Practice for Gas Chromatography Terms and Relationships5. Gas Chromatographic Data5.1 A Chromatogram is a plot of detector response against time or effluent volume. Idealized chromatograms obtained with differential and integral detectors for an unretained substance and one other component ...
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ASTM E355 Practice for Gas Chromatography Terms and Relationships
ASTM E355 Practice for Gas Chromatography Terms and Relationships3. Apparatus3.1 Sample Inlet Systems, represent the means for introducing samples into the separation column, including the heated zones permitting the vaporization of the introduced liquid samples prior to their passage through the column. ...
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ASTM E355 Practice for Gas Chromatography Terms and Relationships
ASTM E355 Practice for Gas Chromatography Terms and Relationships1. Scope1.1 This practice covers primarily the terms and relationships used in gas elution chromatography. However, most of the terms should also apply to other kinds of gas chromatography and are also valid in the various liquid column ...
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ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography
ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography11. Standard Values11.1 Detector characteristics measured at optimum conditions and at the current recommended by the manufacturer may be expected to fall within the typical range of values listed in Table 2 which also indicates ...
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ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography
ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography10. Response Time10.1 Definition - The response time (speed of response) of the detector at a given flow rate is the time required for the output signal to reach 63 % of the new equilibrium value when the composition of the gas ...
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ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography
ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography8. Dynamic Range8.1 Definition - The dynamic range of the detector is that range of concentrations of the test substance, over which a change in concentration produces a change in detector signal. The lower limit is given by the ...
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ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography
ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography6. Minimum Detectability6.1 Definition - Minimum detectability is the concentration of the test substance in the carrier gas which gives a detector signal equal to twice the noise level and is calculated from the measured sensitivity ...
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ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography
ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography5. Sensitivity (Response)5.1 Definition:5.1.1 Sensitivity (response) of the TCD is the signal output per unit concentration of a test substance in the carrier gas, in accordance with the following relationship (7):S = A Fc/Wwhere:S ...
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ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography
ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography3. Significance and Use3.1 Although it is possible to observe and measure each of the several characteristics of a detector under different and unique conditions, it is the intent of this practice that a complete set of detector ...
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ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography
ASTM E516 Testing Thermal Conductivity Detectors Used in Gas Chromatography1. Scope1.1 This practice is intended to serve as a guide for the testing of the performance of a thermal conductivity detector (TCD) used as the detection component of a gas chromatographic system.1.2 This practice is directly ...
