ASTM D2982 Test Methods for Detecting Glycol-Base Antifreeze in Used Lubricating Oils
7. Purity of Reagents
7.1 Purity of Reagents - Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where such specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination.
7.2 Purity of Water - Unless otherwise indicated, references to water shall be understood to mean distilled water conforming to Type III of Specification D1193.
8. Sampling
8.1 Ethylene glycol is immiscible with and heavier than mineral lubricating oil; hence, it will tend to settle. Do not take a sample that is too large to shake vigorously in the laboratory because vigorous shaking is required before conducting the test.
8.2 If the sample delivered is too large to be shaken vigorously, then draw the sample to be tested from a low point in the container.
8.3 Under some circumstances ethylene glycol will emulsify with the oil to form a sludge. If the sample to be tested is a sludge, then dilute the sample with a solvent, such as naphtha or toluene. (Warning - See Note 2.) Use a volume of solvent sufficient to provide a fluid sample for the test.
NOTE 2 - Warning: These solvents are toxic and flammable.
8.4 When drawing a sample directly from an engine or machine, ensure that the sample is representative by drawing it just after the engine or machine has been shut down. If the engine or machine has seized, or it has not seized but is not to be turned over, draw the sample from a low point so as to sample the settled glycol if present.
NOTE 3 - Caution: Avoid a top or dipstick sample because the glycol portion, if present, can be missed.
8.5 Where applicable, Practice D4057 (manual sampling) and Practice D4177 (automatic sampling) will provide useful direction for obtaining consistent and representative samples. Consistent and representative sampling is especially important when the lubricant is in equipment which is still operational and other tests on the sample are also required.
