ASTM D4626 Practice for Calculation of Gas Chromatographic Response Factors
6. Apparatus
6.1 Chromatograph - Any gas chromatograph equipped with either a flame ionization, thermal conductivity or other detector may be used that meets the performance requirements of the method for which calibration is being performed.
6.2 Recorder - A recording potentiometer with a full-scale response time of 1 s or less may be used.
6.3 Integrator or Computer - Means must be provided for determining the detector response. Peak heights or areas can be measured by computer, electronic integration or manual techniques.
NOTE 1 - Rapidly eluting peaks such as those produced by a capillary column are difficult to accurately measure manually. Therefore, peaks of this type must be measured by computer or electronic integration.
6.4 Column - Any column may be used that will satisfactorily separate the compounds of interest, including the solvent, if used.
6.5 Sample Introduction - Sample introduction may be by means of a constant volume liquid sample valve or by injection with a microsyringe through a septum.
6.6 Blend Preparation Apparatus - The specific equipment required to prepare liquid blends is described in Test Method D4307.
7. Reagents and Materials
7.1 Carrier Gas, helium, hydrogen, or other suitable gases may be used depending on the detector and the requirements of the method being calibrated.
7.2 Combustion Gases - Air and hydrogen are required for flame ionization detectors.
7.3 n-Paraffin Hydrocarbons, C6, C7, C8, C9, C10, C11, and C12-99 % pure.
7.4 Solvent, used as a diluent to vary concentrations of blend components. A suitable solvent is one that is relatively non-volatile, miscible with all sample components and, preferably, well resolved chromatographically from all mixture components. In this model, n-C12 is used.
