Study of interactions between relevant organic acids and aluminium in model solutions using HPLC and IC

Abstract

Drábek O., Kipkoech Kiplagat I., Komárek M., Tejnecký V., Borůvka L. (2015): Study of interactions between relevant organic acids and aluminium in model solutions using HPLC and IC. Soil & Water Res., 10: 172-180.The interactions of different organic acids such as citric, malic, oxalic, and fulvic with aluminium were studied using ion-exchange chromatography (IC) and high performance liquid chromatography (HPLC). The experiments were carried out at low pH (1.5-3.1). The results of IC experiments on the interaction between Al and oxalate, citrate, and malate were compared with model chemical equilibrium calculations. The strongest effect on Al speciation was observed with oxalic acid and fulvic acid. These two ligands formed more than one type of complex with Al. In contrast, there was no significant effect of malic acid on Al speciation and a rather weak effect caused by citric acid. The studies show that the formed complexes are stable even at low pH.

Contrasting Roles of Maleic Acid in Controlling Kinetics and Selectivity of Sn(IV)- and Cr(III)-Catalyzed Hydroxymethylfurfural Synthesis

“…We hypothesize that the complementary effects of the organic acid vary with the choice of metal catalyst, because there are different tendencies and forms of bindings between organic ligands and metals, depending on the physicochemical properties of metals such as charge density and water exchange rate constant. 27,28 On the basis of the previous report on the synergy between AlCl 3 and MA in water, 22 we hypothesize that such synergy may take place to different extents in relation to the reaction medium. This subject has not yet been described well, as most of the previous studies focused on catalysis in only one type of media.…”

“…There have been limited studies on the interactions between a tetravalent metal and organic acid during the catalytic conversion of biomass to the best of our knowledge. We hypothesize that the complementary effects of the organic acid vary with the choice of metal catalyst, because there are different tendencies and forms of bindings between organic ligands and metals, depending on the physicochemical properties of metals such as charge density and water exchange rate constant. , On the basis of the previous report on the synergy between AlCl 3 and MA in water, we hypothesize that such synergy may take place to different extents in relation to the reaction medium. This subject has not yet been described well, as most of the previous studies focused on catalysis in only one type of media. , As for conversion of bread waste catalyzed by SnCl 4 only, the kinetics of tandem reactions significantly changed with the choice of organic cosolvent in a binary reaction medium. , …”

Balance design for robust foliar nutrient diagnosis of “Prata” banana (Musa spp.)

“…Foliar Al may accumulate in high-pH soils due to the attack of soil-borne pathogens on banana roots 42 . Roots react by exuding oxalic, malic, and fumaric acids 43 , which may chelate Al ions 44 , 45 . As a result, tissue Al varied widely between orchards but did not reach toxic levels.…”

Neodymium recovery from NdFeB magnets: a sustainable, instantaneous, and cost-effective method

“…Al 3+ shows more interference than Mg 2+ owing to a higher stability constant for the Al 3+ -CFNC complex than that of the Mg 2+ -CFNC complex (smaller size and higher charge lead to more stable complexes). 53,54 These experiments prove that Nd 3+ shows high selectivity towards CFNC even at extremely high concentrations of Ca 2+ and Al 3+ . The high selectivity of Nd 3+ is due to the strong binding energy of Nd-O over the Mg-O or Al-O bond.…”