Mass spectrometric study of the deterioration of polystyrene-based ion-exchangers.
A mass spectrometric study of the aging effects in polystyrene-based ion-exchangers has been made. Fragments in the m/e range 10-70 were examined and attributed to OH(+), H(2)O(+), CO(+), CO(+)(2), supplemented by SO(+) and SO(+)(2) from sulphonic-acid cation-exchangers. Ion-current intensities were found to be dependent on the state of the resin.
Quantitative ion-exchange separation of submicrogram amounts of iron from phosphate medium.
Radiotracer techniques were used to investigate the separation and recovery of submicrogram amounts of iron from major amounts of phosphate resulting from the hydrolysis of phosphorus oxychloride. Iron is retained quantitatively by the column under conditions permitting the efficient elution of phosphate species with 5.OM hydrochloric acid. Iron is then recovered by elution with 0.15M hydrochloric acid-1% hydrazine solution. Precise separations of 10-125 ng of iron with recoveries of 95% or better are reported.
Cerate oxidimetry : Oxidation of formic, glycolic, malic, malonic and tartaric acids
Abstract 1. Contrary to the observations of earlier workers, it has been shown that formic acid can be quantitatively oxidixed by ceric sulphate in the presence of concentrated sulphuric acid. 2. Tartaric, malonic, malic and glycolic acids can also be oxidized completely to carbon dioxide and water by the following general procedure : to a known amount of the organic acid is added ceric sulphate (excess) solution in dilute sulphuric acid and the mixed solution refluxed for ten to fifteen minutes. Concentrated sulphuric acid (double the volume of the reaction mixture) is then added taking care that formic acid is not lost during the addition, and the mixture again refluxed for 45 to 50 minutes. The excess ceric sulphate is determined by titrating against ferrous ammonium sulphate. 3. The complete oxidation of the above acids provides satisfactory methods for their quantitative estimation.