ASTM D5917 規格は総脂肪族炭化水素を検出できます (デカン経由のメタン) 含む 1 に 10 carbon atoms at concentrations ranging from 0.001 に 2.500 % by weight.
意味と使い方

5.1 It is usually necessary to determine the type and amount of hydrocarbon impurities remaining in the manufacture of toluene, mixed xylene and paraxylene used as chemical intermediates and solvents. This test method is suitable for setting specifications and as an internal quality control tool for the production or use of these products. Typical impurities are: alkanes containing 1-10 carbon atoms, ベンゼン, トルエン, ethylbenzene (EB), キシレン, and aromatics containing 9 carbon atoms.

5.2 Purity is usually reported by subtracting the identified expected impurity from 100.00. しかし, if the tested material contains unknown or undetected components, gas chromatography cannot determine absolute purity.

5.3 This test method is similar to test method D2360, しかし, inter-laboratory testing has shown that there may be bias between the two methods. したがって, users are reminded that the two methods may not give comparable results.

ASTM D5917-2015 ガスクロマトグラフィーおよび外部校正による単環芳香族炭化水素中の微量不純物の定量のための標準試験法

ステップ 1: 範囲

1.1 The test method includes the determination of total non-aromatic hydrocarbons and trace monocyclic aromatic hydrocarbons in toluene, mixed xylene and paraxylene by gas chromatography. The purity of toluene, mixed xylene or paraxylene can also be calculated. The calibration of gas chromatography system is completed by external standard calibration technology. A similar test method using the internal standard calibration technique is test method D2360.

1.2 Total aliphatic hydrocarbons (デカン経由のメタン) 含む 1 に 10 carbon atoms can be detected by this test method at concentrations ranging from 0.001 に 2.500 % by weight.

1.2.1 Small amounts of benzene in mixed xylene or paraxylene may differ from non-aromatics and concentrations are determined in complex form (見る 6.1).

ASTM D5917-2015 ガスクロマトグラフィーおよび外部校正による単環芳香族炭化水素中の微量不純物の定量のための標準試験法

1.3 This test method enables the detection of monO impurities (benzene to C10 aromatic compounds) 含む 6 に 10 carbon atoms at individual concentrations ranging from 0.001 に 1.000 重さ %.

1.4 When determining the consistency of test results with applicable specifications, the results shall be rounded according to the rounding method of Practice E29.

1.5 SI 単位で表された値は標準値として扱われます。. この規格には他の測定単位は含まれていません.

1.6 この規格は、すべての安全上の懸念に対処することを目的としたものではありません (もしあれば) その使用に関連する. 適切な安全衛生慣行を確立し、使用前に規制上の制限の適用可能性を判断することは、この規格のユーザーの責任です。. セクションを参照 9 特定の危険性の説明については.