caa a22 4500 467996113 CHVBK 20180323112557.0 cr unu---uuuuu 170328e19900901xx s 000 0 eng 10.1007/BF01242896 doi (NATIONALLICENCE)springer-10.1007/BF01242896 Spectrophotometric determination of Fe(II) in milligram solid samples [Elektronische Daten] [Anna Kowalska, Zygmunt Kowalski, Andrzej Kotarba, Andrzej Barański] The analytical procedure of determination of Fe(II) in the presence of Fe(III) in milligram samples is proposed. A solid sample is dissolved in hydrochloric acid in argon atmosphere. Subsequently, the pH-value of the solution is fixed and Fe(III) complexed by phosphoric buffer. At the next step Fe(II) is oxidized by α-molybdosilicic acid. Finally, the intensity of colouring caused by the reduced form of the acid is measured at the wavelength 770 nm. The proper treatment of the sample during oxidation, and immediately before, is decisive for the accuracy of the analysis. The method was verified by means of the analysis of synthetic magnetite. The theoretical content of Fe(II) was 24.12%, the determined one was 24.02 ± 0.10%. The method was applied to the determination of the homogeneity of an iron catalyst for ammonia synthesis. Springer-Verlag, 1990 analysis of microsamples of solids nationallicence determination of Fe(II) in the presence of Fe(III) nationallicence α-molybdosilicic acid nationallicence Kowalska Anna Regional Laboratory of Physicochemical Analyses and Structural Research, Jagiellonian University, Karasia 3, PL-30-060, Cracow, Poland aut Kowalski Zygmunt Institute of Materials Science, Academy of Mining and Metallurgy, Al. Mickiewicza 30, PL-30-059, Cracow, Poland aut Kotarba Andrzej Department of Chemistry, Jagiellonian University, Karasia 3, PL-30-060, Cracow, Poland aut Barański Andrzej Regional Laboratory of Physicochemical Analyses and Structural Research, Jagiellonian University, Karasia 3, PL-30-060, Cracow, Poland aut Microchimica Acta Springer-Verlag 100/5-6(1990-09-01), 349-353 0026-3672 100:5-6<349 1990 100 604 https://doi.org/10.1007/BF01242896 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01242896 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kowalska Anna Regional Laboratory of Physicochemical Analyses and Structural Research, Jagiellonian University, Karasia 3, PL-30-060, Cracow, Poland aut NATIONALLICENCE 700 1- Kowalski Zygmunt Institute of Materials Science, Academy of Mining and Metallurgy, Al. Mickiewicza 30, PL-30-059, Cracow, Poland aut NATIONALLICENCE 700 1- Kotarba Andrzej Department of Chemistry, Jagiellonian University, Karasia 3, PL-30-060, Cracow, Poland aut NATIONALLICENCE 700 1- Barański Andrzej Regional Laboratory of Physicochemical Analyses and Structural Research, Jagiellonian University, Karasia 3, PL-30-060, Cracow, Poland aut NATIONALLICENCE 773 0- Microchimica Acta Springer-Verlag 100/5-6(1990-09-01), 349-353 0026-3672 100:5-6<349 1990 100 604 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer