De ASTM D5917-standaard kan totale alifatische koolwaterstoffen detecteren (methaan via decaan) bevattend 1 naar 10 carbon atoms at concentrations ranging from 0.001 naar 2.500 % by weight.
Betekenis en gebruik

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, benzeen, tolueen, ethylbenzeen (EB), xyleen, and aromatics containing 9 carbon atoms.

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

ASTM D5917-2015 standaardtestmethode voor de bepaling van sporenverontreinigingen in monocyclische aromatische koolwaterstoffen door gaschromatografie en externe kalibratie

Stap 1: Domein

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 (methaan via decaan) bevattend 1 naar 10 carbon atoms can be detected by this test method at concentrations ranging from 0.001 naar 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 (zien 6.1).

ASTM D5917-2015 standaardtestmethode voor de bepaling van sporenverontreinigingen in monocyclische aromatische koolwaterstoffen door gaschromatografie en externe kalibratie

1.3 This test method enables the detection of monO impurities (benzene to C10 aromatic compounds) bevattend 6 naar 10 carbon atoms at individual concentrations ranging from 0.001 naar 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 Waarden uitgedrukt in SI-eenheden worden behandeld als standaardwaarden. In deze standaard zijn geen andere meeteenheden opgenomen.

1.6 Deze norm is niet bedoeld om alle veiligheidsproblemen aan te pakken (indien aanwezig) die verband houden met het gebruik ervan. Het is de verantwoordelijkheid van gebruikers van deze norm om passende veiligheids- en gezondheidspraktijken vast te stellen en voorafgaand aan gebruik de toepasbaarheid van wettelijke beperkingen te bepalen.. See Section 9 for specific hazard descriptions.