ASTM D5917标准可检测总脂肪烃 (甲烷通过癸烷) 含有 1 到 10 carbon atoms at concentrations ranging from 0.001 到 2.500 % by weight.
意义及用途

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, benzene, toluene, ethylbenzene (EB), xylene, and aromatics containing 9 carbon atoms.

5.2 Purity is usually reported by subtracting the identified expected impurity from 100.00. 然而, 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, 然而, inter-laboratory testing has shown that there may be bias between the two methods. 所以, users are reminded that the two methods may not give comparable results.

ASTM D5917-2015 通过气相色谱法和外部校准测定单环芳烃中痕量杂质的标准测试方法

步 1: 范围

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 (甲烷通过癸烷) 含有 1 到 10 carbon atoms can be detected by this test method at concentrations ranging from 0.001 到 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 (看 6.1).

ASTM D5917-2015 通过气相色谱法和外部校准测定单环芳烃中痕量杂质的标准测试方法

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

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 以 SI 单位表示的值应视为标准值. 本标准不包含其他计量单位.

1.6 本标准并非旨在解决所有安全问题 (如果有的话) 与其使用相关. 本标准的使用者有责任建立适当的安全和健康实践，并在使用前确定监管限制的适用性. 参见章节 9 对于具体的危险描述.