Stability of Aqueous Solutions of Boric Acid Used in the Kjeldahl Method

1934 ◽  
Vol 6 (6) ◽  
pp. 473-473 ◽  
Author(s):  
Abner Eisner ◽  
E. C. Wagner
Keyword(s):  
Aqueous Solutions ◽  
Boric Acid ◽  
Kjeldahl Method

Fractionation of Boron Isotopes to Bis(2-hydroxyalkyl)amine Borate and Boric Acid in Aqueous Solutions

1999 ◽  
Vol 28 (11) ◽  
pp. 1153-1154 ◽  
Author(s):  
Takahiro Hirotsu ◽  
Akinari Sonoda ◽  
Yoji Makita ◽  
Hirofumi Kanoh ◽  
Norio Takagi ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Boric Acid ◽  
Boron Isotopes

scholarly journals Chitosan Hydrogel Beads Supported with Ceria for Boron Removal

2019 ◽  
Vol 20 (7) ◽  
pp. 1567 ◽  
Author(s):  
Joanna Kluczka ◽  
Gabriela Dudek ◽  
Alicja Kazek-Kęsik ◽  
Małgorzata Gnus
Keyword(s):  
Aqueous Solutions ◽  
Boric Acid ◽  
Inductively Coupled Plasma ◽  
High Efficiency ◽  
Optical Emission ◽  
Freundlich Isotherm ◽  
Maximum Adsorption Capacity ◽  
Hydroxyl Groups ◽  
Chitosan Hydrogel ◽  
Chitosan Beads

In this study, a chitosan hydrogel supported with ceria (labelled Ce-CTS) was prepared by an encapsulation technique and used for the efficient removal of excess B(III) from aqueous solutions. The functionalisation of chitosan with Ce(IV) and the improvement in the adsorptive behaviour of the hydrogel were determined by SEM-EDS, FTIR, XRD, and inductively coupled plasma optical emission spectrometer (ICP-OES) analyses and discussed. The results demonstrate that Ce-CTS removes boric acid from aqueous solutions more efficiently than either cerium dioxide hydrate or raw chitosan beads, the precursors of the Ce-CTS biosorbent. The maximum adsorption capacity of 13.5 ± 0.9 mg/g was achieved at pH 7 after 24 h. The equilibrium data of boron adsorption on Ce-CTS fitted the Freundlich isotherm model, while the kinetic data followed the Elovich pseudo-second-order model, which indicated that the process was non-homogeneous. The dominant mechanism of removal was the reaction between boric acid molecules and hydroxyl groups bound to the ceria chelated by chitosan active centres. Due to its high efficiency in removing boron, good regeneration capacity and convenient form, Ce-CTS may be considered a promising biosorbent in water purification.

Dissolution of Colemanite in Aqueous Solutions Saturated with Both Sulfur Dioxide (SO2) Gas and Boric Acid

2006 ◽  
Vol 45 (6) ◽  
pp. 1857-1862 ◽  
Author(s):  
Abdusselam Kurtbaş ◽  
M. Muhtar Kocakerim ◽  
Özkan Küçük ◽  
Ahmet Yartaşı
Keyword(s):  
Sulfur Dioxide ◽  
Aqueous Solutions ◽  
Boric Acid ◽  
So2 Gas

scholarly journals 11B NMR Investigations of Borate Esters in Aqueous Solutions and Wine

1986 ◽  
Vol 41 (8) ◽  
pp. 1041-1044 ◽  
Author(s):  
O. Lutz ◽  
E. Veil ◽  
U. Brändle ◽  
H. Helber ◽  
E. Kämmerer ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Boric Acid ◽  
Carboxylic Acids ◽  
Chemical Shifts ◽  
Dilute Solutions ◽  
Nmr Studies ◽  
11B Nmr ◽  
Borate Esters ◽  
Hydroxy Carboxylic Acids ◽  
Nmr Signals

11B NMR studies have been performed in dilute solutions of boric acid resp. borate and some typical hydroxy-carboxylic acids as a function of pH. Typical chemical shifts have been found for the esters occurring at the different ranges of pH. The origin of the two 11B NMR signals observable in wine could be determined.

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