UNSULFONATED RESIDUE OF OILS: ASTM D483
EXPLANATION
This test method is useful for distinguishing between oils that are adaptable to various types of spraying application, with a higher sulfonated oil being required for leaf spraying as compared to dormant vegetation application. Since the relationship between unsulfonated residue and the actual composition of the oil is not known, this test method should be applied only for measuring the degree of refinement and not for the determination of aromatics or olefins, or both.
TEST SUMMARY
A measured volume of the sample is shaken with 98.61 % sulfuric acid at 100° C in a Babcock bottle, shaking mechanically for 10 s at 10 min intervals. The volume not absorbed by the acid is a measure of the unsulfonated residue in the sample.
TEST PRECISION
In the 79 to 97 % unsulfonated range, this test method has a repeatability of 0.5 and a reproducibility of 2.0.
The bias of this test method is not known.
