ASTM D847-96(2000)
(Test Method)Standard Test Method for Acidity of Benzene, Toluene, Xylenes, Solvent Naphthas, and Similar Industrial Aromatic Hydrocarbons
Standard Test Method for Acidity of Benzene, Toluene, Xylenes, Solvent Naphthas, and Similar Industrial Aromatic Hydrocarbons
SCOPE
1.1 This test method is intended for the detection of acidity and for the quantitative determination of acidity of benzene, toluene, xylenes, solvent naphthas, and similar industrial aromatic hydrocarbons.
1.2 The following applies to all specified limits in this test method: for purposes of determining conformance with this test method, an observed value or a calculated value shall be rounded off "to the nearest unit" in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29.
1.3 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 Section 8.
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Designation: D 847 – 96 (Reapproved 2000)
Standard Test Method for
Acidity of Benzene, Toluene, Xylenes, Solvent Naphthas,
and Similar Industrial Aromatic Hydrocarbons
This standard is issued under the fixed designation D 847; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3.1.1 acidity—the number of milligrams of sodium hydrox-
ide consumed when 100 mL of the specimen are titrated under
1.1 This test method is intended for the detection of acidity
the conditions prescribed in this test method.
and for the quantitative determination of acidity of benzene,
3.1.2 acid reaction—a characteristic of materials producing
toluene, xylenes, solvent naphthas, and similar industrial aro-
the acid-color of the indicator used under the conditions
matic hydrocarbons.
prescribed in this test method.
1.2 The following applies to all specified limits in this test
3.1.3 alkaline or basic reaction—a characteristic of the
method: for purposes of determining conformance with this
materials producing the alkali-color of the indicator used under
test method, an observed value or a calculated value shall be
the conditions prescribed in this test method.
rounded off “to the nearest unit” in the last right-hand digit
used in expressing the specification limit, in accordance with
4. Summary of Test Method
the rounding-off method of Practice E 29.
4.1 The acidity of aromatic hydrocarbons is detected and
1.3 This standard does not purport to address all of the
determined quantitatively using a sodium hydroxide titration
safety concerns, if any, associated with its use. It is the
and a color change in a phenolphthalein indicator.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use. For specific hazard
5.1 This test method is suitable for setting specifications, for
statements see Section 8.
use as an internal quality control tool, and for use in develop-
2. Referenced Documents ment or research work on industrial aromatic hydrocarbons and
related materials. This test method gives an indication of
2.1 ASTM Standards:
2 residual acidity and is a measure of the quality of the finished
D 1193 Specification for Reagent Water
product. It is an indication of the tendency of the product to
D 3437 Practice for Sampling and Handling Liquid Cyclic
3 corrode equipment.
Products
E 29 Practice for Using Significant Digits in Test Data to
6. Interferences
Determine Conformance with Specifications
6.1 Tests for acidity are not applicable in the presence of
2.2 Other Documents:
contaminating acidic or alkaline gases, soaps, salts, or other
OSHA Regulations, 29 CFR, Paragraphs 1910.1000 and
compounds derived from the atmosphere or apparatus. The
1910.1200
container holding the specimen, and the apparatus, water,
indicator, and other materials used in the test shall be chosen so
3. Terminology
that they themselves shall not appreciably affect the results.
3.1 Definitions:
Since new corks used in specimen bottles often are bleached
with oxalic acid, it is advisable to rinse them thoroughly and
check them for neutrality with the indicator used in the test.
This test method is under the jurisdiction of ASTM Committee D16 on
Glassware shall be of acid-resistant and alkali-resistant glass
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
and shall be rinsed with neutral distilled water before use. The
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane, and Their
Derivatives.
room in which the test is performed shall be chosen so as to
Current edition approved June 10, 1996. Published August 1996. Originally
prevent undue contamination by carbon dioxide, ammonia, or
published as D 847 – 45 T. Last previous edition D 847 – 91.
2 other interfering substances that may be present in the atmo-
Annual Book of ASTM Standards, Vol 11.01.
sphere.
Annual Book of ASTM Standards, Vol 06.04.
Annual Book of ASTM Standards, Vol 14.02.
Available from Superintendent of Documents, U.S. Government Printing
Office, Washington, DC 20402. Borosilicate glass or the equivalent has been found satisfactory for this purpose.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 847
6.2 The distilled water used in the test shall not alter the 9. Hazards
composition of the specimen nor otherwise interfere with the
9.1 Consult current OSHA regulations, supplier’s Material
purpose of the work. Although inert impurities often may be
Safety Data Sheets, and local regulations for all materials used
neglected, care must be exercised to correct for impurities or to
in this test method.
eliminate them entirely if they are likely to interfere. When the
10. Sampling
distilled water does not show an acid or alkaline reaction, it
may be used without further adjustment to neutrality. However,
10.1 Sample the material in accordance with Practice
if the water shows an acid or alkaline reaction, it shall be
D 3437.
brought to a persistent pink end point before use by titration
11. Procedure
with standard 0.01 N NaOH solution (see 8.5) or standard 0.01
11.1 Measure out 100 mL of the sample into the 500-mL
N H SO , respectively.
2 4
bottle. Add
...
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