ASTM D2110-00(2012)
(Test Method)Standard Test Method for pH of Water Extractions of Halogenated Organic Solvents and Their Admixtures
Standard Test Method for pH of Water Extractions of Halogenated Organic Solvents and Their Admixtures
SIGNIFICANCE AND USE
The pH of halogenated solvents varies according to the nature of stabilizers in the particular solvent. Solvents with alkaline stabilizers (amine-types) generally have pHs in the 7 to 11 range, whereas solvents containing neutral stabilizers (epoxide-types) generally have pHs in the 5 to 7 range.
Virgin and reclaimed solvents should have pHs within these ranges, dependent upon the claimed method of stabilization. These values should be within the accepted limits as proposed by the producers of the original virgin solvent.
A lowering of pH from the above values, on receipt or use, is cause for concern. In this event, solvents having epoxide stabilizers should be tested for acid acceptance; solvent having alkaline stabilizers should be tested for alkalinity.
SCOPE
1.1 This test method covers the measurement of the pH of water extractions of halogenated organic solvents and admixtures thereof. This test method is applicable for the determination of the pH of water extractions of virgin, reclaimed, or used solvents.
1.2 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.
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Designation: D2110 − 00 (Reapproved 2012)
Standard Test Method for
pH of Water Extractions of Halogenated Organic Solvents
and Their Admixtures
This standard is issued under the fixed designation D2110; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Apparatus
1.1 This test method covers the measurement of the pH of 4.1 Universal Indicator and pH Indicator Color Chart
water extractions of halogenated organic solvents and admix- (Procedure A), or
tures thereof. This test method is applicable for the determina-
4.2 pH Meter (Procedure B).
tion of the pH of water extractions of virgin, reclaimed, or used
solvents.
5. Water
1.2 This standard does not purport to address all of the
5.1 Neutral Distilled or Deionized Water shall be prepared
safety concerns, if any, associated with its use. It is the
as follows: Boil 1 Lof distilled or deionized water for 5 min in
responsibility of the user of this standard to establish appro-
a borosilicate glass or stainless steel container, then cover and
priate safety and health practices and determine the applica-
cool to room temperature.
bility of regulatory limitations prior to use.
5.2 Procedure A—To a 50–mL aliquot of the cooled, boiled
water, add 2 mL of Universal Indicator. Titrate the aliquot to a
2. Summary of Test Method
pH of 7 (as indicated by comparing the color of the aliquot to
2.1 The solvent sample is shaken with freshly boiled neutral
thecolorchartpermanufacturer’sinstructions)witheither0.01
distilled or deionized water and the pH of the water extract
N HCl if the pH is above 7 or 0.01 N NaOH if the pH is below
determined by one of two procedures:
7, and record the titer. From this titer, calculate and add the
2.1.1 ProcedureA, by comparing the color formed upon the
volume of 0.01 N NaOH or 0.01 N HCl required to adjust the
addition of Universal Indicator with that of a calibrated pH
remaining 950 mL of the boiled distilled or deionized water to
Indicator Color Chart, or
a pH of 7. The amount of 0.01 N NaOH or 0.01 N HCl needed
2.1.2 Procedure B, using a glass electrode pH meter.
toneutralizethe950mLwaterwillbe19Xtiter.Determinethe
pH of a second aliquot. If further adjustment is necessary to
3. Significance and Use
obtain a pH of 7, repeat the above procedure.
3.1 The pH of halogenated solvents varies according to the
5.3 Procedure B—Using a pH meter, titrate a 50 mL aliquot
nature of stabilizers in the particular solvent. Solvents with
to a pH of 7.0 to 7.3 with either 0.01 N HCl if the pH is above
alkaline stabilizers (amine-types) generally have pHs in the 7
7.0 or 0.01 N NaOH if the pH is 7.0 and record the titer. From
to 11 range, whereas solvents containing neutral stabilizers
this titer, calculate and add the volume of 0.01N NaOH or 0.01
(epoxide-types) generally have pHs in the 5 to 7 range.
N HCl required to adjust the remaining 950 mL of the boiled
3.2 Virgin and reclaimed solvents should have pHs within
distilled or deionized water to a pH pf 7.0 to 7.3. The amount
these ranges, dependent upon the claimed method of stabiliza-
of 0.01 N NaOH or 0.01 N HCl needed to neutralize the 950
tion. These values should be within the accepted limits as
mL water will be 19 X titer. Determine the pH of a second
proposed by the producers of the original virgin solvent.
aliquot. If f
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