ASTM D7828-2012
用自动热解吸/气相色谱法 (ATD/GC) 测定液化石油气 (LPG) 中残基组成的标准试验方法

Standard Test Method for Determination of Residue Composition in Liquefied Petroleum Gas (LPG) Using Automated Thermal Desorption/Gas Chromatography (ATD/GC)

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标准号

ASTM D7828-2012

发布日期

2012年

实施日期

废止日期

无

中国标准分类号

E46

国际标准分类号

75.160.30 (Gaseous fuels)

发布单位

US-ASTM

适用范围

5.1x00a0;Residue in LPG is a contaminant that can lead to operational problems in some end use applications. Engines, micro-turbines, fuel cells and other equipment may be sensitive to residue levels as low as 10 mg/kg.

5.2x00a0;Contamination of LPG can occur during production, transport, delivery, storage and use. A qualitative indication of the contaminants can help track down the source of the contamination from manufacture, through the distribution system, and to the end user.

5.3x00a0;This test method is designed to provide a lower detection limit, wider dynamic range, and better accuracy than gravimetric methods like Test Method D2158.

5.4x00a0;This test method can be performed with little or no discharge of LPG vapors, compared to Test Method D2158 which requires evaporation of 100 mL of sample per test.

5.5x00a0;Sampling for residue in LPG using sorbent tubes can be performed in the field, and the sorbent tubes sent to a laboratory for analysis. This saves significant costs in shipping (weight of tube is approximately 10 grams), and is much safer and easier than transporting LPG cylinders.

5.6x00a0;This test method determines total residues from C₆ to C₄₀, compared to a thermal gravimetric residue method such as Test Method D2158 which heat the residue to 38x00b0;C, resulting in a lower recovery due to loss of lighter residue components.

5.7x00a0;If there is a need to decrease the detection limit of residue or individual compounds of interest below 10 x00b5;g/g, the procedures in this test method can be modified to achieve 50 times enhanced detection limit, or 0.2 x00b5;g/g.

1.1x00a0;This test method covers the determination of residue in LPG by automated thermal desorption/gas chromatography (ATD/GC) using flame ionization detection (FID).

1.2x00a0;The quantitation of residue covers a component boiling point range from 69x00b0;C to 522x00b0;C, equivalent to the boiling points of C₆ through C₄₀ n-paraffins.

1.2.1x00a0;The boiling range covers possible LPG contaminants such as gasoline, diesel fuel, phthalates and compressor oil. Qualitative information on the nature of the residue can be obtained from this test method.

1.2.2x00a0;Materials insoluble in LPG and components which do not elute from the gas chromatograph or which have no response in a flame ionization detector are not determined.

1.2.3x00a0;The reporting limit (or limit of quantitation) for total residue is 6.7 x00b5;g/g.

1.2.4x00a0;The dynamic ......

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