ASTM D2007 for characteristic groups in processing oils & petroleum-derived oils
ASTM D2007 standard test method for characteristic groups in rubber extender and processing Oils and other petroleum-derived oils by the clay-gel absorption chromatographic method
9. Calculation
9.1 Calculate the amount of n-pentane insolubles, saturates, aromatics, and polar compounds in the sample as follows:
Saturates, mass % = (B/A) x 100
Aromatics, mass % = (C/A) x 100
Polar compounds (Note 11), for 10 g sample = (D/A) x 100
Polar compounds, mass % for 5 g sample = [(0.88 x D/A)] x 100
where:
A = grams of original sample used,
B = grams of residue from n-pentane effluent from the clay gel column (8.1.4),
C = grams of residue from the toluene desorption of the lower column and from the last n-pentane rinse of the columns (8.1.6 and 8.2.3), and
D = grams of residue from toluene-acetone effluent (8.1.8).
NOTE 7 - The factor included in the calculation for the 5 g sample is established experimentally to maintain continuity of results over a wide range of polar compounds in rubber extender oils.
9.2 The total mass of all the recovered fractions must equal at least 97 % of the sample charged. If this recovery is not obtained, repeat the test.
9.3 If aromatics were not desorbed, use the n-pentane insolubles, saturates content, and polar compounds as determined in 9, calculate the amount of aromatics as follows:
Aromatics, mass % = 100 - (E + F)
where:
E = mass % saturates, and
F = mass % polar compounds.
