ASTM F862-93(1998)

Standard Test Method for pH and Chloride-ion Concentration of Aerospace Hydraulic Fluids

SCOPE
1.1 This test method covers the measurement of the pH and chloride ion of water extraction of aerospace hydraulic fluids.  
1.2  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.

General Information

• Status: Historical
• Publication Date: 14-Jan-1993
• Technical Committee: F07 - Aerospace and Aircraft
• Drafting Committee: F07.07 - Qualification Testing of Aircraft Cleaning Materials

Relations

• Replaced By: ASTM F862-93(2002) - Standard Test Method for pH and Chloride-ion Concentration of Aerospace Hydraulic Fluids (Withdrawn 2011)
• Effective Date: 15-Jan-1993

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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.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: F 862 – 93 (Reapproved 1998)
Standard Test Method for
pH and Chloride-ion Concentration of Aerospace Hydraulic
Fluids
This standard is issued under the fixed designation F 862; 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.
1. Scope 5.3 Reference Electrode—A calomel, silver/silver chloride,
or other reference electrode of constant potential.
1.1 This test method covers the measurement of the pH and
5.4 Silver/Silver Sulfide Electrode.
chloride ion of water extraction of aerospace hydraulic fluids.
5.5 Double Junction Reference Electrode, sleeve-type.
1.2 This standard does not purport to address all of the
5.6 Separatory Funnel, 250 mL.
safety concerns, if any, associated with its use. It is the
5.7 Buret, 10-mL capacity.
responsibility of the user of this standard to establish appro-
5.8 Titration Stand, preferably built as an integral part of the
priate safety and health practices and determine the applica-
meter housing and provided with support for the electrodes and
bility of regulatory limitations prior to use.
electrical stimer, all connected to ground.
2. Referenced Documents 5.9 Gran’s Plot Paper.
2.1 ASTM Standards:
6. Reagents
D 1193 Specification for Reagent Water
6.1 Water, reagent grade, Type IV, in accordance with
3. Summary of Method
Specification D 1193.
6.2 Reference Buffer Solutions, Standards 185, 186,
3.1 The aerospace hydraulic fluid sample is shaken with
and 187—Materials supplied by the National Bureau of Stan-
water, and the pH and the quantity of chloride ion are
dards with pH values.
determined from the water layer.
−3
6.3 Silver Nitrate Solution, Standard (2.82 3 10 M)—
3.1.1 The pH is measured using a glass electrode and pH
Dissolve 4.7909 g of silver nitrate dissolved in 1 L of water and
meter.
diluted 1:10.
3.1.2 The quantity of the chloride ion is determined using a
silver/sulfide electrode and a specific ion meter.
7. Standardization of pH Meter
4. Significance and Use
7.1 Turn on the instrument, allow it to warm up thoroughly,
and bring it to electrical balance in accordance with the
4.1 On application of the hydraulic fluid within the me-
manufacturer’s instructions. Wash the glass and reference
chanical fluidic system, the fluid may become contaminated
electrodes with three changes of water. Form a fresh liquid
with acid and chloride ion. Mechanical shearing of the hydrau-
junction if a sleeve-type reference junction is used.
lic fluid in the presence of the minute quantity of water and
7.2 Fill the sample cup with the first reference buffer
residual amount of organic solvents, used in cleaning, may
solution and immerse the electrodes. If the pH meter is of the
initiate formation of acid and chloride ion. Measurements are
zero-null type, set the dial of the meter to equal pH value of the
desired to control and maintain the cleanliness and noncorro-
reference buffer solution. Engage the operating button and
siveness of the fluidic system.
rotate the standardization knob until the meter is brought to
5. Apparatus
balance. If the pH meter is of the direct-reading type, engage
the operating button, turn the range switch to the proper
5.1 pH Meter, with expanded millivolt scale and a sensitiv-
position, and rotate the asymmetry-potential knob until the
ity of 1 mV. The method can be adopted for use with a
reading corresponds to the pH of the reference buffer. Empty
selective-ion meter.
the sample cup and repeat until two successive readings are
5.2 Glass Electrode—The pH response shall be 60.05 pH.
obtained without adjustment of the controls.
7.3 Wash the electrodes and the sample cup three times with
This test method is under the jurisdiction of ASTM Committee F-7 on
water. Place the second reference buffer solution in the sample
Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.07 on
Qualification Testing of Aircraft Cleaning Materials.
Current edition approved Jan. 15, 1993. Published April 1993. Originally The Orion Research Model has been found satisfactory.
published as F 862 – 84. Last previous edition F 862 – 84. The Orion Model 90-01 has been found satisfactory.
2 6
Annual Book of ASTM Standards, Vol 11.01. Gran’s plot paper is available from Orion Research, Inc., 380 Putnam Ave.,
The Orion Model 901 has been found satisfactory. Cambridge, MA 02139.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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