caa a22 4500 465748341 CHVBK 20180323111826.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00323418 doi (NATIONALLICENCE)springer-10.1007/BF00323418 Fluorimetric determination of beryllium with 4-methyl-6-acetyl-7-hydroxycoumarin [Elektronische Daten] [Hiroyuki Yoshida, Takushi Ito, Akira Murata] Summary: The acid dissociation constant of 4-methyl-6-acetyl-7-hydroxycoumarin, as determined by spectrophotometry was found to be Ka=9.77×10−9. Beryllium reacts with this reagent to form a water-insoluble complex that can be extracted into benzene. The maximum wavelengths of the excitation and emission spectra of the beryllium complex in benzene are 403 and 465 nm, respectively. Beryllium can be determined in the range 0.005∼0.1 μg per 10 ml benzene when extracted from the solution at pH 7.5∼7.8 into benzene. Springer-Verlag, 1990 Yoshida Hiroyuki Faculty of Engineering, Shizuoka University, Johoku, 432, Hamamatsu, Japan aut Ito Takushi College of Engineering, Shizuoka University, Johoku, 432, Hamamatsu, Japan aut Murata Akira Faculty of Engineering, Shizuoka University, Johoku, 432, Hamamatsu, Japan aut Fresenius' Journal of Analytical Chemistry Springer-Verlag 338/6(1990-01-01), 738-740 0937-0633 338:6<738 1990 338 216 https://doi.org/10.1007/BF00323418 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00323418 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yoshida Hiroyuki Faculty of Engineering, Shizuoka University, Johoku, 432, Hamamatsu, Japan aut NATIONALLICENCE 700 1- Ito Takushi College of Engineering, Shizuoka University, Johoku, 432, Hamamatsu, Japan aut NATIONALLICENCE 700 1- Murata Akira Faculty of Engineering, Shizuoka University, Johoku, 432, Hamamatsu, Japan aut NATIONALLICENCE 773 0- Fresenius' Journal of Analytical Chemistry Springer-Verlag 338/6(1990-01-01), 738-740 0937-0633 338:6<738 1990 338 216 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer