Standard Test Method for
Alkalinity in Brackish Water, Seawater, and Brines1
This standard is issued under the fixed designation D 3875; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the 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.
1.1 This test method covers the determination of alkalinity
in brackish water, seawater, and brines.
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.
2. Referenced Documents
2.1 ASTM Standards:
D 1129 Terminology Relating to Water2
D 1193 Specification for Reagent Water2
D 3370 Practices for Sampling Water from Closed Conduits2
D 5847 Practice for Writing Quality Control Specifications
for Standard Test Methods for Water Analysis3
E 200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical
3.1 Definitions—For definitions of terms used in this test
method, refer to Terminology D 1129.
4. Summary of Test Method
4.1 An electroporator or pH meter is used to determine the
amount of acid necessary to reach pH 8.1 and 4.5, respectively.
The pH values approximate the points where the hydroxide and
bicarbonate ions are neutralized.
5. Significance and Use
5.1 Alkalinity as carbonate and bicarbonate of saline water
is very important in chemical waterflooding or tertiary recovery processes for recovering petroleum. Alkaline waters offer
better wetting to the formation rock and improve oil release. As
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