Standard addition method for free acid determination in solutions with hydrolyzable ions

• Main Author: Baumann, E. W.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Savannah River Laboratory 1981
• Subjects: Actinide Compounds; Charged Particles; Hormone Antagonists; Organic Compounds; Alkali Metal Compounds; Antithyroid Drugs; Nitric Acid; Dispersions; Chemical Reactions; Ph Value; Thiocyanates; Nitrogen Compounds; Transition Element Compounds; Chromium Compounds; Aluminium Nitrates; Titration; Potassium Compounds; Hydrolysis; Uranium Compounds; Iron Nitrates; Organic Sulfur Compounds; Ions; Drugs; Nickel Compounds; Nitrates; Uranyl Nitrates; Calculation Methods; Inorganic Acids; 11 Nuclear Fuel Cycle And Fuel Materials; Iron Compounds; Hydrogen Compounds; Aluminium Compounds; Lysis; Chemical Analysis; Oxygen Compounds; Carbonic Acid Derivatives; Chromium Nitrates; 37 Inorganic; Organic; Physical And Analytical Chemistry; Thorium Compounds; Potentiometry; Quantitative Chemical Analysis; Thorium Nitrates; Mixtures; Decomposition; Nickel Nitrates; Cations; 050800 > Nuclear Fuels > Spent Fuels Reprocessing; Uranyl Compounds 400102* > Chemical & Spectral Procedures; Solvolysis; Carbonic acid
• Online Access: https://digital.library.unt.edu/ark:/67531/metadc1096124/

The free acid content of solutions containing hydrolyzable ions has been determined potentiometrically by a standard addition method. Two increments of acid are added to the sample in a 1M potassium thiocyanate solution. The sample concentration is calculated by solution of three simultaneous Nernst equations. The method has been demonstrated for solutions containing Al/sup 3 +/, Cr/sup 3 +/, Fe/sup 3 +/, Ni/sup 2 +/, Th/sup 4 +/, or UO/sub 2//sup 2 +/ with a metal-to-acid ratio of < 2.5. The method is suitable for determination of 10 .mu.moles acid in 10 mL total volume. The accuracy is verifiable by reasonable agreement of the Nerst slopes found in the presence and absence of hydrolyzable ions. The relative standard deviation is < 2.5 percent.