TN44: The Determination of Trace Anions in Concentrated Phosphoric Acid
DescriptionThe determination of trace anions in phosphoric acid is hampered by a large excess of phosphate ion. Diluting the concentrated sample overcomes the problem of a large concentration of the interfering matrix ion, but lacks the required sensitivity for the contaminant ions of interest. An improved method for determining trace anions in concentrated phosphoric acid has been developed to overcome this problem. This Technical Note describes the theory, set up, and analytical procedure for the determination of chloride, nitrate, and sulfate at sub-mg/L (ppm) levels in 85% (w/w) phosphoric acid.
|Keywords:||Ion Exclusion, IonPac AS11, IonPac ICE-AS6, SEMI, TN 44|
|Author:||Edward Kaiser and Jeffrey Rohrer|
|Affiliation:||Thermo Fisher Scientific|
For Research Use Only. Not for use in diagnostic procedures.