ASTM D483 Test Method for Unsulfonated Residue of Petroleum Plant Spray Oils
4. Summary of Test Method
4.1 A measured volume of 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.
5. Significance and Use
5.1 This test method is useful for distinguishing between oils that are adaptable to various types of spraying application, with a higher unsulfonated oil being required for leaf spraying as compared to dormant vegetation application.
