Survey and Trends in the Preparation of Chemically Bonded Silica Phases for Liquid Chromatographic Analysis

Kinetics and equilibrium parameters of Hg(II) adsorption on silica–dithizone

“…Silica gel is a very stable amorphous inorganic polymer composed of siloxane (Si-O-Si) groups in the inner region and silanol (Si-OH) groups distributed on the surface [1][2][3]. Chemical surface modifications can occur with this polymer by reaction with silane coupling agents.…”

“…Chemically modified silicas are used extensively in many scientific and technological applications, for example, as HPLC bonded phases for specific separations [2,3,[9][10][11], supports for catalysts in specific organic reactions [12], and supports for microorganisms [13] and pesticides [14], as well as for the immobilization of humic acid [15] and the extraction of metallic cations from aqueous and nonaqueous solvents, by forming immobilized metallic complexes, which present variable compositions and distorted geometries [16]. Our research group has extensively studied this last application, in order to find kinetic and thermodynamic data on the interactions between metals and modified surfaces [17][18][19][20].…”

Indirect Voltammetric Sensing Platforms For Fluoride Detection on Boron-Doped Diamond Electrode Mediated via [FeF 6 ] 3− and [CeF 6 ] 2− Complexes Formation

“…This method is fast without sample pretreatment. Oswałdowski et al [43] developed a liquid chromatographic probe for fluoride determination in fluoride modified chromatographic stationary phase [44,45]. This probe is based on the fluoride complex formation with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP); (equilibrium system Zr(IV)-(5-Br-PADAP)/Zr(IV)-F À -(5-Br-PADAP).…”

HPLC columns partition by chemometric methods based on peptides retention☆

“…On the other hand, there are often significant differences between similarly prepared and commercially available columns, mainly due to the characteristics of the silica material used as a support and the technique applied to synthesize packing material. Not only individual adsorbents differ in their dependence on the manufacturer, but the batch-to-batch repeatability of the same producer is also rather poor in many cases [3]. Therefore, methods for column comparison and grouping are essential.…”