caa a22 4500 467996229 CHVBK 20180323112558.0 cr unu---uuuuu 170328e19900101xx s 000 0 eng 10.1007/BF01244501 doi (NATIONALLICENCE)springer-10.1007/BF01244501 Determination of tungsten and tin ions after preconcentration by flotation [Elektronische Daten] [Ulrich Dietze, Steffi Kunze] A highly sensitive and selective combined method of flotation followed by spectrophotometry/d.c. polarography for the determination of tungsten and tin ions in acid and alkaline waste waters and hydrometallurgical solutions is presented here. Both kinds of ions are coprecipitated in the analyte solution with zirconium hydroxide after addition of ZrOCl2 solution and ammonia. Afterwards, the collector precipitate is separated from the aqueous phase and preconcentrated by flotation for which sodium oleate and a frother are added. The precipitate is dissolved in a small amount of acid, with the organic reagents being destroyed by oxidation. The enrichment factor of the proposed technique is 100, with variations possible. Recovery is 94% for tungsten and 99% for tin. Spectrophotometry of the thiocyanate complex and d.c. polarography are applied as determination techniques for tungsten and tin, respectively. Detection limits attainable by this technique are 6 ng · ml−1 for tungsten and 5 ng · ml−1 for tin for the initial sample. Springer-Verlag, 1990 simultaneous trace analysis nationallicence hydrometallurgical solution nationallicence polarography nationallicence spectrophotometry nationallicence flotation nationallicence tin nationallicence tungsten nationallicence Dietze Ulrich Research Institute of Mineral Processing, Strasse des Friedens 40, DDR-9200, Freiberg, German Democratic Republic aut Kunze Steffi Research Institute of Mineral Processing, Strasse des Friedens 40, DDR-9200, Freiberg, German Democratic Republic aut Microchimica Acta Springer-Verlag 100/1-2(1990-01-01), 75-80 0026-3672 100:1-2<75 1990 100 604 https://doi.org/10.1007/BF01244501 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01244501 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dietze Ulrich Research Institute of Mineral Processing, Strasse des Friedens 40, DDR-9200, Freiberg, German Democratic Republic aut NATIONALLICENCE 700 1- Kunze Steffi Research Institute of Mineral Processing, Strasse des Friedens 40, DDR-9200, Freiberg, German Democratic Republic aut NATIONALLICENCE 773 0- Microchimica Acta Springer-Verlag 100/1-2(1990-01-01), 75-80 0026-3672 100:1-2<75 1990 100 604 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer