NACE TM0399

Determination of Phosphonate Concentration in Water

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Organization: NACE
Publication Date: 6 April 2018
Status: active
Page Count: 12
scope:

General

This standard test method is a colorimetric determination of low concentrations of phosphonate residuals in water from oil and gas production, water injection/disposal, and other industrial applications. 

This test method is applicable to determination of phosphonate concentrations in the range of 0.1 to 5 mg/L. 

For samples containing more than 5 mg/L phosphonate, the sample must first be diluted with a known quantity of deionized water so that the phosphonate concentration is within the applicable range of this test method. The quantity of deionized water added is used to compute the Laboratory Dilution Factor described in Section 10.1.

Analyses of water samples containing less than 0.5 mg/L phosphonate shall follow the modification in Paragraph 8.1.1.

Additional information can be found in API(1) RP 45.2 

This test method is intended to analyze low phosphonate concentrations in waters that contain interferences. Typical interferences include calcium, barium, strontium, sulfate, sulfide, orthophosphate, silicate, and iron (Fe+2/Fe+3). Other interferences include oil droplets, turbidity, and high total dissolved solids (> 100,000 mg/L). [out of place - moved to 1.5]

This standard test method is comprised of three steps: (1) the first step is to digest the sample digestion to convert all phosphonate to orthophosphate; (2) the second step is to convert the orthophosphate conversion to a to a phosphomolybdate (PO3Mo12O36) complex,by adding a molybdate reagentthe third step is to extraction of the complex into an organic liquid phase, and color development, and (3) colorimetric determination of its concentration. 

This test method has been successfully tested for and is considered valid when used for analyzing the phosphonate concentration and has been used successfully with reagent water, produced water, and synthetic brines. It is the responsibility of the user to ensure the validity of this test method when used for water of untested matrices.

Personnel using this standard must have good analytical skills.

(1) American Petroleum Institute (API), 1220 L St. NW, Washington, DC 20005-4070.

Document History

NACE TM0399
April 6, 2018
Determination of Phosphonate Concentration in Water
General This standard test method is a colorimetric determination of low concentrations of phosphonate residuals in water from oil and gas production, water injection/disposal, and other industrial...
June 25, 1999
Standard Test Method for Phosphonate in Brine
This standard covers the colorimetric determination of phosphonate in the range of 0.1 to 5 mg/L in brines from gas and oil production operations, water injection/ disposal operations, and other...
June 25, 1999
Standard Test Method for Phosphonate in Brine
General This standard test method covers the colorimetric determination of phosphonate in the range of 0.1 to 5 mg/L in brines from oil and gas production operations, water injection/disposal...

References

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