Standard Test Method for Sulfate Ion in Brackish Water, Seawater, and Brines

SCOPE
1.1 This test method covers the turbidimetric determination of sulfate ion in brackish water, seawater, and brines. It has been used successfully with synthetic brine grade waters; however, it is the user's responsibility to ensure the validity of this test method to other matrices.  
1.2 This test method is applicable to waters having an ionic strength greater than 0.65 mol/L and a sulfate ion concentration greater than 25 mg/L. A concentration less than 25 mg/L sulfate can be determined by using a standard addition method.  
1.3 For brines having an ionic strength of less than 0.65 mol/L, refer to Test Methods D516.  
1.4 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.

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Publication Date
09-Jun-1999
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ASTM D4130-99 - Standard Test Method for Sulfate Ion in Brackish Water, Seawater, and Brines
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 4130 – 99
Standard Test Method for
1
Sulfate Ion in Brackish Water, Seawater, and Brines
This standard is issued under the fixed designation D 4130; 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 4. Summary of Test Method
1.1 This test method covers the turbidimetric determination 4.1 A sulfate ion is converted to a barium sulfate suspended
of sulfate ion in brackish water, seawater, and brines. It has under controlled conditions. A glycerin-acid solution is added
been used successfully with synthetic brine grade waters; to acidify and stabilize the suspension. A calculated volume of
however, it is the user’s responsibility to ensure the validity of a NaCl solution is added to adjust the ionic strength to a set
this test method to other matrices. value of 2 mol/L (Note 1). The turbidity resulting upon
1.2 This test method is applicable to waters having an ionic addition of barium chloride is determined by a photoelectric
strength greater than 0.65 mol/L and a sulfate ion concentration colorimeter and compared to a curve prepared from standard
greater than 25 mg/L. A concentration less than 25 mg/L sulfate sulfate solutions.
can be determined by using a standard addition method.
NOTE 1—The ionic strength (IS) of the sample is calculated from the
1.3 For brines having an ionic strength of less than 0.65 + ++ ++ −
concentration of the major ion constituents (Na ,Ca ,Mg ,Cl ),
+ ++
mol/L, refer to Test Methods D 516.
(K and Sr if their concentration exceeds 2000 mg/L) as follows:
1.4 This standard does not purport to address all of the
where:
safety problems, if any, associated with its use. It is the
2
IS, mol/L = 1/2 ( C Z ,
i i
responsibility of the user of this standard to establish appro-
C = g/L ion i/molecular weight ion, i, and
i
priate safety and health practices and determine the applica-
Z = valence of ion i.
i
bility of regulatory limitations prior to use.
5. Significance and Use
2. Referenced Documents
5.1 The determination of sulfate and other dissolved con-
2.1 ASTM Standards:
stituents is important in identifying the source of brines
2
D 516 Test Methods for Sulfate Ion in Water
produced during the drilling and production phases of crude oil
2
D 1129 Terminology Relating to Water
or natural gas.
D 1192 Specification for Equipment for Sampling Water
2
and Steam
6. Interferences
2
D 1193 Specification for Reagent Water
6.1 Suspended matter in the sample must be removed. Dark
D 2777 Practice for Determination of Precision and Bias of
colors that cannot be compensated for in the procedure
2
Applicable Methods of Committee D-19 on Water
interfere with the measurement of suspended barium sulfate
D 3370 Practices for Sampling Water from Closed Con-
(BaSO ).
4
2
duits
E 275 Practice for Describing and Measuring Performances 7. Apparatus
of Ultraviolet, Visible, and Near Infrared Spectrophotom-
7.1 Photometer—A filter photometer or a spectrophotom-
3
eters
eter for measurements between 400 to 450 nm, the preferable
wavelength being 425 nm. The cell for the instrument must
3. Terminology
have a light path of 20 6 2 mm and hold a volume of 25 mL.
3.1 Definitions—For definitions of terms used in this test
Filter photometers, spectrophotometers, and photometric prac-
method, refer to Terminology D 1129.
tices prescribed in this test method shall conform to Practice
E 275.
1
This test method is under the jurisdiction of ASTM Committee D-19 on Water
8. Reagents
and is the direct responsibility of Subcommittee D19.05 on Inorganic Constituents
in Water.
8.1 Purity of Reagents—Reagent grade chemicals shall be
Current edition approved June 10, 1999. Published September 1999. Originally
used in all tests. Unless otherwise indicated, it is intended that
E1
published as D 4130–82. Last previous edition D 4130–82 (1992)
2 all reagents shall conform to the specifications of the commit-
Annual Book of ASTM Standards, Vol 11.01.
3
tee on Analytical Reagents of the American Chemical Society,
Annual Book of ASTM Standards, Vol 03.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 4130 – 99
4
where such specifications are available. Other grades may be The ionic strength (IS) of the sample when diluted to 100 must
used, providing it is first ascertained that the reagent is of not exceed 2.00 mol/L.
...

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