Determination of phosphorus in gold or silver brazing alloys

Technical Report · Mon Dec 20 04:00:00 EST 1976

DOI:https://doi.org/10.2172/6426399· OSTI ID:6426399

Antepenko, R. J.

A spectrophotometric method has been devised for measuring microgram levels of phosphorus in brazing alloys of gold or silver alloys is normally measured by solid mass spectrometry, but the high nickel concentration produces a double ionized nickel spectral interference. The described procedures is based upon the formation of molybdovandophosphoric acid when a molybdate solution is added to an acidic solution containing orthophosphate and vanadate ions. The optimum acidity for forming the yellow colored product is 0.5 N hydrochloric acid. The working concentration range is from 0.1 to 1 ppm phosphorus using 100-mm cells and measuring the absorbance at 460 nm. The sample preparation procedure employs aqua regia to dissolve the alloy oxidize the phosphorus to orthophosphate. Cation-exchange chromatography is used to remove nickel ions and anion-exchange and chromatography to remove gold ions as the chloride complex. Excellent recoveries are obtained for standard phosphorus solutions run through the sample procedure. The procedure is applicable to a variety of gold or silver braze alloys requiring phosphorus analysis.

• Research Organization: General Electric Co., St. Petersburg, FL (USA). Neutron Devices Dept.
• DOE Contract Number: EY-76-C-04-0656
• OSTI ID: 6426399
• Report Number(s): GEPP-TIS-414
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
ALLOYS
CHEMICAL ANALYSIS
ELEMENTS
GOLD ALLOYS
INTERFERING ELEMENTS
METALS
NICKEL
NONMETALS
PHOSPHORUS
QUANTITATIVE CHEMICAL ANALYSIS
SILVER ALLOYS
SPECTROPHOTOMETRY
TRANSITION ELEMENTS