ASTM D, D, and EPA 3C are used for the analysis of permanent gases (also called fixed gases) and light hydrocarbons at the percentage level in all. (A) Hydrocarbon compounds containing between one and five atoms of carbon plus benzene using ASTM D–03 (Reapproved ) (incorporated by. American Standards Testing & Materials (ASTM). D Standard D 03 Standard Test Method for Analysis of Natural Gas by Gas. Chromatography.
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Enter the sample and obtain a response through methane Note 5. Either the average d1945–03 the two consecutive checks, or the latest check agreeing within the repeatability limits of the previous check on each component may be used as the reference standard for all subsequent runs until there is a change in instrument operating conditions. Avoid introduction of liquids into the sample system.
The oven temperature shall not exceed the recommended temperature limit for the asym in the column. However, short and long partition columns provide the flexibility of three partition column lengths, by using them either singly or in series. W i t h either type manometer the m m scale can be read more accurately than the inch scale.
This gives the Relative Molar Response factor RMRi for component 0- The reference component must be present in the same instrumental sequence except HexanesH- as the referenced components.
This component is present i n the daily calibration standard and linearity is assured from previous tests.
Close the n-pentane cyhnder valve and open Cylinder A valve to admit the n-pentane from the connection and then close the valve on Cylinder A. Warning—Some components, such as carbon dioxide, hydrogen sulfide, and hexanes and higher hydrocarbons, may be partially or completely removed by the water.
D1945-033 as required to dry the sample.
40 CFR 600.011 – Incorporation by reference.
This procedure will remove small amounts of hydrogen sulfide while having but minimal effect on the carbon dioxide in the sample. Make calculations in the same manner as for the complete analysis method. Avoid contact with the skin as much as possible.
An accumulation of oily film in the sampling system greatly aggravates this problem.
The higher the temperature the shorter the equilibration time approximately 2 h for small sample containers of mL or less. Preparation of Apparatus 6. Heated lines may be necessary for high hydrocarbon content samples. Daily calibrations are recommended. See Table 2 and Table 3.
I f this condition cannot be remedied by adjustment o f the gain, check the electronics in the recorder. They must contain known percents of the components, except oxygen Note 5that are to be determined in the unknown sample.
Run a sample of the standard mixture at kPa mm H g pressure and obtain peaks for methane and nitrogen. A smaller loop size should replace the fixed volume loop and 6. Record the peak area of die pure component. A flowing sample inlet system is acceptable as long as viscosity effects are accounted for.
40 CFR – Incorporation by reference. | US Law | LII / Legal Information Institute
Weigh the 1-L cylinder to determine the weight of methane transferred. The sum of the original values should not differ from Ethane can be the reference component for carbon dioxide i f it elutes i n aatm same sequence as carbon dioxide.
The U-tube type is useful, since i t permits filling the sample loop w i t h up to two atmospheres of sample pressure, thus extending the range of all components. Also measure the areas of both pentane peaks on the sample chromatogram, and adjust all measured areas aastm the same attenuation basis. The sample-entry system must be vacuum tight.
Enter a 1- to 5-mL sample into the column and reverse the carrier gas flow after n-pentane is separated. Obtain a corresponding response on the reference standard.
The surface effect of small diameter tubing acts as a separating column and must not be used in the sampling and entering system when components heavier than pentanes are to be determined. The values given asfm parentheses are mathematical conversions to SI units that are provided for information only and are asstm considered standard.