The ASTM D5917 standard can detect total aliphatic hydrocarbons (methane via decane) containing 1 Zu 10 carbon atoms at concentrations ranging from 0.001 Zu 2.500 % by weight.
Bedeutung und Verwendung

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, Toluol, Ethylbenzol (EB), xylene, and aromatics containing 9 carbon atoms.

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

ASTM D5917-2015 Standard Test Method for Determination of Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and External Calibration

Schritt 1: Umfang

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 (methane via decane) containing 1 Zu 10 carbon atoms can be detected by this test method at concentrations ranging from 0.001 Zu 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 (sehen 6.1).

ASTM D5917-2015 Standard Test Method for Determination of Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and External Calibration

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

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 In SI-Einheiten ausgedrückte Werte gelten als Standardwerte. In dieser Norm sind keine anderen Maßeinheiten enthalten.

1.6 Diese Norm soll nicht alle Sicherheitsbedenken berücksichtigen (wenn überhaupt) mit seiner Verwendung verbunden. Es liegt in der Verantwortung der Benutzer dieser Norm, vor der Verwendung geeignete Sicherheits- und Gesundheitspraktiken festzulegen und die Anwendbarkeit behördlicher Beschränkungen zu bestimmen. Siehe Sektion 9 für spezifische Gefahrenbeschreibungen.