ASTM-D94 2007

$40.63

D94-07 Standard Test Methods for Saponification Number of Petroleum Products

Published By	Publication Date	Number of Pages
ASTM	2007	9

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Category: ASTM

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Description

1.1 These test methods cover the determination of the amount of constituents in petroleum products such as lubricants, additives, and transmission fluids that will saponify under the conditions of the test.

Note 1Statements defining this test and its significance when applied to electrical insulating oils of mineral origin will be found in Guide D 117. Experience has shown that for transformer oils, Test Method D 94, modified by use of 0.1 M KOH solution and 0.1 M HCl, is more suitable.

1.1.1 Two test methods are described: Method A-Color Indicator Titration (Sections 6-13), and Method BPotentiometric Titration (Sections 14-23).

1.2 Because compounds of sulfur, phosphorus, the halogens, and certain other elements that are sometimes added to petroleum products also consume alkali and acids, the results obtained indicate the effect of these extraneous materials in addition to the saponifiable material present. Results on products containing such materials, on used internal-combustion-engine crankcase oils, and on used turbine oils must be interpreted with caution.

Note 2The materials referred to above, which are not normally considered saponifiable matter, include inorganic or certain organic acids, most nonalkali soaps, and so forth. The presence of such materials increases the saponification number above that of fatty saponifiable materials for which the test method is primarily intended. The odor of hydrogen sulfide near the end of the back-titration in the saponification test is an indication that certain types of reactive sulfur compounds are present in the sample. In the case of other reactive sulfur, chlorine, and phosphorus compounds and other interfering materials, no simple indication is given during the test. A gravimetric determination of the actual amount of fatty acids is probably the most reliable method for such compounds. Test Methods D 128 or IP Method 284/86 can be used to determine fatty acids gravimetrically.

1.3 The values stated in SI units are to be regarded as the standard.

1.4 This standard does not purport to address all of the safety concerns, 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. For specific hazard statements, see Sections 6, 7, 8, 10, 15, 16, 17, and 19.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Summary of Test Method Significance and Use Apparatus Reagents
3	Blank Determinations Sample Procedure Calculation
4	Report Precision and Bias Apparatus FIG. 1
5	Reagents Preparation, Testing, and Maintenance of Electrode System FIG. 2
6	Blank Determination Sample Procedure FIG. 3
7	Quality Control Checks Calculation Report Precision and Bias Keywords
8	X1. ANALYTICAL HINTS FOR PERFORMING TEST METHODS D94 X1.1