Polymeric Functionalized Stationary Phase for Separation of Ionic Compounds by IC

Synthesis and properties are described of multilayered stationary phases containing quaternary amine functional groups used for the analysis of inorganic anions by ion chromatography. The bonded phases were characterized by elemental analysis, solid state 13C NMR spectroscopy and chromatographic methods. The surface of polyhydroxyethyl methacrylate (solid support) was coated with polymeric layers formed by condensation polymerization of primary amine with diepoxide. Each layer of the anion exchange stationary phase consisted of methylamine and 1,4-butanedioldiglycidyl ether copolymer. A series of stationary phases with different number of polymerized layers were tested. Separation of inorganic anions, such as F−, Cl−, NO2−, Br−, NO3−, were performed. Aqueous hydroxide, carbonate and bicarbonate solutions were used as mobile phases

Nanomaterials developed for dispersive solid phase extraction, part 1 – modifications of classical materials

Solid phase extraction (SPE) is an analytical procedure developed with the purpose of separating a target analyte from a complex sample matrix prior to quantitative or qualitative determination. The purpose of such treatment is twofold: elimination of matrix constituents that could interfere with the detection process or even damage analytical equipment as well as enriching the analyte in the sample so that it is readily available for detection. Dispersive solid phase extraction (dSPE) is a relatively recent development of the standard SPE technique that is attracting growing attention due to its remarkable simplicity, short extraction time and low requirement for solvent expenditure, accompanied by high effectiveness and wide applicability. There is an enormous abundance of articles concerning advances in sample preparation and analysis published every year. The aim of this review is to bring to closer attention developments of materials with potential application as sorbents in dSPE technique through a thorough survey of recently conducted analytical studies focusing on methods utilizing novel, interesting nanomaterials in dSPE procedures and evaluation of their performance and suitability based on comparison of provided validation parameters with previously reported analytical procedures. The first part of this review focuses on widely known and utilized materials such as silica and carbon and their modifications, up to and including graphene and carbon nanotubes. Studies chosen for this review will be listed in tables alongside their relevant validation parameters at the end of each chapter. Applications found to be particularly interesting due to high effectiveness, unusual operating procedure or scope, among other reasons, will be described in greater detail

Natural Organic Matter in Ecosystems - a Review

One of the most essential parameters limiting the potential use of the ecosystem (soil, water) is the content of the organic matter. The natural organic matter (NOM) is a ubiquitous component of the lithosphere and hydrosphere that constitutes one of the largest reservoirs of the carbon in the environment. Natural organic substances play several important functions in ecosystems and they are necessary for their normal functioning. Despite many years of the research and using many advanced analytical techniques, their structure has not been fully explained. The main aim of this review is to present the actual state of the knowledge about the natural organic matter and provide a comprehensive overview of the research that has explored up to date in this matter. The additional attention was focused on the relations within and between humic and fulvic acids in terrestrial and aquatic environments. Special attention is focused on the analytical methods used to analysis natural organic matte

Recent nanomaterials developed for dispresive solid phase extraction. Part 2, Modern materials

The second part of the review shifts attention to novel modern materials applied to dSPE as sorbents, that are often designed specifically for the extraction of a particular analyte. This part will focus on advances in materials such a molecularly imprinted polymers (MIP), metallic organic frameworks (MOF), layered double hydroxides (LDH) or magnetic nanoparticles (MNP). As in the first part, studies chosen for this review will be listed in tables alongside their relevant validation parameters at the end of each chapter. Studiesfound to be particularly interesting due to high effectiveness, unusual operating procedure or scope, among other reasons, will be described in greater detail