ASTM D6501-09
Standard Test Method for Phosphonate in Brines
- Standard No.
- ASTM D6501-09
- Release Date
- 2009
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM D6501-15
- Latest
- ASTM D6501-15
- Scope
This test method is useful for the determination of trace level phosphonate residues in brines. Chemical treatment 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 decision for treatment is based on the ability to measure low phosphonate concentration and not upon performance criteria. Phosphonate concentrations as low as 0.16 mg/L have been shown effective in carbonate scale treatment. This test method enables the measurement of sub-mg/L phosphonate concentration in brines containing interfering elements.
The procedure includes measuring total (see 12.3.8) and free orthophosphate (see 12.4.3) ions and the difference in concentration is the phosphonate concentration. The sample could contain orthophosphate naturally, or from decomposition of the phosphonate during processing or well treatment or from treating compounds containing molecular dehydrated phosphates.
1.1 This test method covers the colorimetric determination of phosphonate (PNA) in brines from gas and oil production operations in the range from 0.1 to 5 mg/L.
1.2 This phosphonate method is intended for use to analyze low concentration of phosphonate in brine containing interfering elements. This test method is most useful for analyzing phosphonate at 0.1 to 1 mg/L range in brines with interfering elements; however, it requires personnel with good analytical skill.
1.3 This test method has been used successfully with reagent water and both field and synthetic brine. It is the user's responsibility to ensure the validity of this test method for waters of untested matrices.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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. For specific hazard statements, see 9.1.3.
ASTM D6501-09 Referenced Document
- ASTM D1129 Standard Terminology Relating to Water
- ASTM D1193 Standard Specification for Reagent Water
- ASTM D2777 Standard Practice for Determination of Precision and Bias of Applicable Methods of Committee D-19 on Water
- ASTM D3370 Standard Practices for Sampling Water from Closed Conduits
- ASTM D3856 Standard Guide for Good Laboratory Practices in Laboratories Engaged in Sampling and Analysis of Water
- ASTM D4375 Standard Practice for Basic Statistics in Committee D-19 on Water
- ASTM D5810 Standard Guide for Spiking into Aqueous Samples
- ASTM D5847 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
- ASTM E275 Standard Practice for Describing and Measuring Performance of Ultraviolet, Visible, and Near-Infrared Spectrophotometers
ASTM D6501-09 history
- 2015 ASTM D6501-15 Standard Test Method for Phosphonate in Brines
- 2009 ASTM D6501-09 Standard Test Method for Phosphonate in Brines
- 2004 ASTM D6501-04 Standard Test Method for Phosphonate in Brines
- 1999 ASTM D6501-99 Standard Test Method for Phosphonate in Brines
