ASTM D847-96

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.

General Information

• Status: Historical
• Publication Date: 09-Jun-2000
• Technical Committee: D16 - Aromatic, Industrial, Specialty and Related Chemicals
• Drafting Committee: D16.01 - Benzene, Toluene, Xylenes, Cyclohexane and Their Derivatives

Relations

• Replaced By: ASTM D847-96(2000) - Standard Test Method for Acidity of Benzene, Toluene, Xylenes, Solvent Naphthas, and Similar Industrial Aromatic Hydrocarbons
• Effective Date: 10-Jun-2000
• Referred By: ASTM D268-22 - Standard Guide for Sampling and Testing Volatile Solvents and Chemical Intermediates for Use in Paint and Related Coatings and Material
• Effective Date: 10-Jun-2000
• Referred By: ASTM D4790-23 - Standard Terminology of Aromatic Hydrocarbons and Related Chemicals
• Effective Date: 10-Jun-2000

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 847 – 96
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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 the conditions prescribed in this test method.
3.1.2 acid reaction—a characteristic of materials producing
1.1 This test method is intended for the detection of acidity
the acid-color of the indicator used under the conditions
and for the quantitative determination of acidity of benzene,
prescribed in this test method.
toluene, xylenes, solvent naphthas, and similar industrial aro-
3.1.3 alkaline or basic reaction—a characteristic of the
matic hydrocarbons.
materials producing the alkali-color of the indicator used under
1.2 The following applies to all specified limits in this test
the conditions prescribed in this test method.
method: for purposes of determining conformance with this
test method, an observed value or a calculated value shall be
4. Summary of Test Method
rounded off “to the nearest unit” in the last right-hand digit
4.1 The acidity of aromatic hydrocarbons is detected and
used in expressing the specification limit, in accordance with
determined quantitatively using a sodium hydroxide titration
the rounding-off method of Practice E 29.
and a color change in a phenolphthalein indicator.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
5.1 This test method is suitable for setting specifications, for
priate safety and health practices and determine the applica-
use as an internal quality control tool, and for use in develop-
bility of regulatory limitations prior to use. For specific hazard
ment or research work on industrial aromatic hydrocarbons and
statements see Section 8.
related materials. This test method gives an indication of
2. Referenced Documents residual acidity and is a measure of the quality of the finished
product. It is an indication of the tendency of the product to
2.1 ASTM Standards:
corrode equipment.
D 1193 Specification for Reagent Water
D 3437 Practice for Sampling and Handling Liquid Cyclic
6. Interferences
Products
6.1 Tests for acidity are not applicable in the presence of
E 29 Practice for Using Significant Digits in Test Data to
4 contaminating acidic or alkaline gases, soaps, salts, or other
Determine Conformance with Specifications
compounds derived from the atmosphere or apparatus. The
2.2 Other Documents:
container holding the specimen, and the apparatus, water,
OSHA Regulations, 29 CFR, Paragraphs 1910.1000 and
indicator, and other materials used in the test shall be chosen so
1910.1200
that they themselves shall not appreciably affect the results.
Since new corks used in specimen bottles often are bleached
3. Terminology
with oxalic acid, it is advisable to rinse them thoroughly and
3.1 Definitions:
check them for neutrality with the indicator used in the test.
3.1.1 acidity—the number of milligrams of sodium hydrox-
Glassware shall be of acid-resistant and alkali-resistant glass
ide consumed when 100 mL of the specimen are titrated under
and shall be rinsed with neutral distilled water before use. The
room in which the test is performed shall be chosen so as to
This test method is under the jurisdiction of ASTM Committee D-16 on
prevent undue contamination by carbon dioxide, ammonia, or
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
other interfering substances that may be present in the atmo-
Subcommittee D16.0A on Benzene, Toluene, Xylenes, Cyclohexane, and Their
Derivatives. sphere.
Current edition approved June 10, 1996. Published August 1996. Originally
6.2 The distilled water used in the test shall not alter the
published as D 847 – 45 T. Last previous edition D 847 – 91.
composition of the specimen nor otherwise interfere with the
Annual Book of ASTM Standards, Vol 11.01.
Annual Book of ASTM Standards, Vol 06.04. purpose of the work. Although inert impurities often may be
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.
D 847
neglected, care must be exercised to correct for impurities or to Safety Data Sheets, and local regulations for all materials used
eliminate them entirely if they are likely to interfere. When the in this test method.
distilled water does not show an acid or alkaline reaction, it
10. Sampling
may be used without further adjustment to neutrality. However,
if the water shows an acid or alkaline reaction, it shall be 10.1 Sample the material in accordance with Practice
D 3437.
brought to a persistent pink end point before use by titration
with standard 0.01 N NaOH solution (see 8.5) or standard
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