ASTM D6501-04

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6501–04
Standard Test Method for
1
Phosphonate in Brines
This standard is issued under the fixed designation D6501; 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* D4375 Practice for Basic Statistics in Committee D19 on
Water
1.1 This test method covers the colorimetric determination
D5810 Guide for Spiking into Aqueous Samples
of phosphonate (PNA) in brines from gas and oil production
D5847 Practice for Writing Quality Control Specifications
operations in the range from 0.1 to 5 mg/L.
for Standard Test Methods for Water Analysis
1.2 This phosphonate method is intended for use to analyze
E275 Practice for Describing and Measuring Performance
low concentration of phosphonate in brine containing interfer-
of Ultraviolet and Visible Spectrophotometers
ing elements. This test method is most useful for analyzing
phosphonate at 0.1 to 1 mg/L range in brines with interfering
3. Terminology
elements; however, it requires personnel with good analytical
3.1 Definitions—For definitions of terms used in this test
skill.
method, refer to Terminology D1129.
1.3 This test method has been used successfully with
3.2 Definitions of Terms Specific to This Standard:
reagent water and both field and synthetic brine. It is the user’s
3.2.1 phosphonate, n—a group of organophosphorus com-
responsibility to ensure the validity of this test method for
pounds typically used for mineral scale and corrosion control,
waters of untested matrices.
as cleaning agents, dispersants, and chelants. Typical phospho-
1.4 This standard does not purport to address all of the
nate compounds include, but are not limited to, the following
safety concerns, if any, associated with its use. It is the
phosphonic acid and their neutralized salts: Aminotri(methyl-
responsibility of the user of this standard to establish appro-
enephosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic
priate safety and health practices and determine the applica-
acid, ethylenediaminetetra (methylenephosphonic acid), hex-
bility of regulatory limitations prior to use. For specific hazard
amethylenediaminetetra (methylenephosphonic acid), and di-
statements, see 9.1.3.
ethylenetriaminepenta (methylenephosphonic acid).
2. Referenced Documents
4. Summary of Test Method
2
2.1 ASTM Standards:
4.1 Phosphonate materials are converted to orthophosphate
D1129 Terminology Relating to Water
by potassium persulfate digestion. The orthophosphate is then
D1192 Guide for Equipment for SamplingWater and Steam
3 reacted with ammonium molybdate to form a phosphomolyb-
in Closed Conduits
date complex.The complex is extracted with a methyl isobutyl
D1193 Specification for Reagent Water
ketone/cyclohexane mixture and measured colorimetrically.
D2777 Practice for Determination of Precision and Bias of
Applicable Test Methods of Committee D19 on Water
5. Significance and Use
D3370 Practices for Sampling Water from Closed Conduits
5.1 This test method is useful for the determination of trace
D3856 Guide for Good Laboratory Practices in Laborato-
level phosphonate residues in brines. Chemical treatment
ries Engaged in Sampling and Analysis of Water
which contain phosphonates are used as mineral scale and
corrosion inhibitors in gas and oil drilling and production
operations; and other industrial applications. Often, the deci-
1
This test method is under the jurisdiction of ASTM Committee D19 on Water
sion for treatment is based on the ability to measure low
and is the direct responsibility of Subcommittee D19.05 on Inorganic Constituents
in Water.
phosphonate concentration and not upon performance criteria.
Current edition approved March 1, 2004. Published April 2004. Originally
Phosphonate concentrations as low as 0.16 mg/L have been
approved in 1999. Last previous edition approved in 1999 as D6501–99. DOI:
shown effective in carbonate scale treatment. This test method
10.1520/D6501-04.
2
enables the measurement of sub-mg/L phosphonate concentra-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contactASTM Customer Service at service@astm.org. ForAnnual Book ofASTM
tion in brines containing interfering elements.
Standards volume information, refer to the standard’s Document Summary page on
5.2 The procedure includes measuring total (see 12.3.8) and
the ASTM website.
3 free orthophosphate (see 12.4.3) ions and the difference in
Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org. concentration is the phosphonate concentration. The sample
*A Summary of Changes section appears at the end of this standard.
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