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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Obtain a corresponding chromatogram of the reference standard. The well type inherendy offers better precision and is preferred when calibrating w i t h pure components. 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.

A flowing sample inlet system is acceptable as long as viscosity effects are accounted for. Copper, vinyl, or rubber connections are not acceptable. Maintain all samples above the hydrocarbon dew point.

Enter the sample and obtain a response through methane Note 5. Measure areas of all peaks eluted after n-pentane. The expressed numerical value of any component in the sample should not be presumed to be more accurate than the corresponding certified value of that component in the calibration standard.

I f this condition cannot be remedied by adjustment o f the gain, check the electronics in the recorder. Either the average of 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 contact with the skin as much as possible. Die bond process intro It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 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.

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This contamination can be minimized by such techniques as purging with inert gas, heating the sample loop, using a vacuum system, or other such effective means. This procedure will remove small amounts of hydrogen sulfide while having but minimal effect on the carbon dioxide in the sample.

Weigh the 1-L cylinder to determine the weight of methane transferred. Then fill Cylinder B with helium and hydrogen respectively to the pressures required to provide the desired concentrations of these components in the final blend. Close the cylinder valves, disconnect, and weigh Cylinder A to determine die weight of mixture that was not transferred to the L cylinder. This eliminates the need for a multicomponent standard for daily calibration.

Run a chromatogram of each component to check on its given composition. Evacuate the sample-entry system and observe the manometer for leaks. The purity of the carrier gas may be improved by flowing the carrier gas through selective filters prior to its entry into the chromatograph.

I f all columns are chosen to operate at the same temperature, then stabilization time between changing columns will be minimized. Enter a 1- to 5-mL sample and record the response for helium, followed by hydrogen, which will be just ahead of oxygen Note 5.

40 CFR – Incorporation by reference. | US Law | LII / Legal Information Institute

Select a sample size in accordance with 8. I f hydrogen is present, use aluminum, stainless steel, or other d1945-003 inert to hydrogen sulfide for the cylinder, valves, lines, and connections. The area of reverse flow peak may be measured by planimeter or geometric construction. The U-tube type is useful, since i d19450-3 permits filling the sample loop w i t h up to two atmospheres of sample pressure, thus extending the d195-03 of all components.

This analysis method assumes field sampling methods have removed entrained liquids. The slope a, can be calculated by: NOTE 1 — T h e sample size limitation of 0. The attenuator must be accurate to within 0. I f i t does not, the cause may be a leak in the carrier gas system, faulty flow regulator, or an unbalanced condition o f the column or plumbing.

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ASTM D气相色谱法分析天然气的标准试验方法_图文_百度文库

The resolution R must be 1. The satnple loop pressure should be near atmospheric. Two coluimis are necessary to determine all of the components covered in this test method. Weigh Cylinder B after each addition to obtain the weight of the component added.

Periodically, check Cg and heavier repeatability of the apparatus asttm making several check runs on the same sample. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are d1945-033 considered standard.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. It is strongly recommended in the absence of valve ovens to mount the gas samphng valve in the chromatograph oven and operate at the column temperature.

Replace the drying agent after about one half of the material has become spent.

40 CFR 600.011 – Incorporation by reference.

I f increased accuracy of the hexanes and heavier portions of the analysis is required, a larger sample size may satm used see Test Method D The air must be either entered at an accurately measured reduced pressure, or from a helium-diluted mixture. If a recorder is used, the recorder pen must return to the baseline between each successive peak.

Avoid introduction of liquids into the sample system. Copper, brass, and other copper-bearing alloys are unacceptable. Permission rights to photocopy the standard may also be d1945-003 from the ASTM website www.