ASTM D1093 for Acidity of Hydrocarbon Liquids and Their Distillation Residues
1. Scope
1.1 This test method covers the qualitative determination of the acidity of hydrocarbon liquids and their distillation residues. Warning - See Note 1.
NOTE 1 - Warning: Many hydrocarbon liquids are extremely flammable. Harmful if inhaled. Hydrocarbon liquid vapors can cause a flash fire.
1.2 If desired to determine the basicity of a hydrocarbon liquid, proceed in accordance with 9.2 or 9.3 but substitute 3 drops of phenolphthalein indicator solution for the methyl orange indicator. A pink or red color in the aqueous solution when phenolphthalein is used indicates basicity.
1.3 The results obtained by this method are qualitative expressions. However, for the preparation of reagents and in the procedure, acceptable SI units are to be regarded as the standard.
1.4 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D86 Test Method for Distillation of Petroleum Products
D91 Test Method for Precipitation Number of Lubricating Oils
D850 Test Method for Distillation of Industrial Aromatic Hydrocarbons and Related Materials
D1078 Test Method for Distillation Range of Volatile Organic Liquids
D1193 Specification for Reagent Water
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4177 Practice for Automatic Sampling of Ptroleum and Petroleum Products
3. Terminology
3.1 Definitions:
3.1.1 acidity, n - the quality, state or degree of being acid.
3.1.2 Discussion - In this test method, the criterion for acidity is a pink or red color when methyl orange indicator is used.
3.1.3 basicity, n - the quality, state or degree of being basic.
3.1.4 Discussion - In this test method, the criterion for basicity is a pink or red color when phenolphthalein indicator is used.
3.1.5 distillation residue, n - that portion of the sample remaining after distillation using specified procedures.
