意义及用途

5.1 This test method is intended to determine the concentration of known impurities in finished benzene and to be used as an overall quality control tool for the production or use of benzene in the manufacturing process. It is commonly applied to impurities such as non-aromatic compounds containing 9 or fewer carbons, toluene, C8 aromatic compounds, 和 1, 4-dioxane.

5.2 If undetected impurities are present, absolute purity cannot be determined.

ASTM D7360-2016 通过外部校准气相色谱法分析苯的标准测试方法

步 1: 范围

1.1 This test method includes the determination of normal trace impurities and purity of benzene in finished products by gas chromatography and external calibration. A similar test method using the internal standard calibration technique is test method D4492.

1.2 This test method is suitable for non-aromatic impurities with a content of 5 到 2000 mg/kg and a benzene purity of 99.80% (by weight) 或更高.

1.3 This test method is suitable for 5~2000 mg/kg of aromatic impurities in benzene.

1.4 The test method has been found to be suitable for heteroatomic species such as 1, 4-dioxane, 10 到 2000 mg/kg in benzene.

1.5 The detection limits for aromatic impurities are 0.9 毫克/公斤, 2.7 mg/kg for 1, 4-dioxane, 和 1.1 mg/kg for cyclohexane.

ASTM D7360-2016 通过外部校准气相色谱法分析苯的标准测试方法

1.6 When using this method to determine the consistency of test results with applicable specifications, the results should be rounded according to the rounding method of Practice E29.

1.7 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.

1.8 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.