caa a22 4500 469112840 CHVBK 20180323133116.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF02164954 doi (NATIONALLICENCE)springer-10.1007/BF02164954 Simultaneous determination of uranium(VI) and thorium(IV) with carminic acid by derivative spectrophotometry [Elektronische Daten] [P. López-de-Alba, L. López-Martínez] The reactions of uranium(VI) and thorium(IV) ions with carminic acid have been investigated. These ions react with carminic acid in neutral medium, forming colored complexes. The dark purple or red wine complexes show a high absorption in the visible region (597 nm U(VI) and 616 nm Th(IV)). Chemical variables that affect the reaction have been optimized. The spectral overlapping of the color of complexes has been resolved by first-derivative spectrophotometry. The simultaneous determination of uranium(VI) and thorium(IV) mixtures is accomplished by taking the derivative signal ("zero crossing”) at 597 nm for U(VI) determination and at 616 nm for Th(IV) determination, respectively. The method has been applied to Tyuyamonite ore, containing in the matrix both ions. Akaémiai Kiadó, 1992 López-de-Alba P. Instituto de Investigaciones Científicas, Universidad de Guanajuato, L. de Retana No. 5, 36000, Guanajuato, Gto., Mexico aut López-Martínez L. Instituto de Investigaciones Científicas, Universidad de Guanajuato, L. de Retana No. 5, 36000, Guanajuato, Gto., Mexico aut Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 164/5(1992-03-01), 309-319 0236-5731 164:5<309 1992 164 10967 https://doi.org/10.1007/BF02164954 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02164954 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- López-de-Alba P. Instituto de Investigaciones Científicas, Universidad de Guanajuato, L. de Retana No. 5, 36000, Guanajuato, Gto., Mexico aut NATIONALLICENCE 700 1- López-Martínez L. Instituto de Investigaciones Científicas, Universidad de Guanajuato, L. de Retana No. 5, 36000, Guanajuato, Gto., Mexico aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 164/5(1992-03-01), 309-319 0236-5731 164:5<309 1992 164 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer