Chromium occurrence in the environment and methods of its speciation.

On-line sample preconcentration in capillary electrophoresis: Fundamentals and applications

Three photoluminescent zinc coordination polymers (CPs), {[Zn2(tpeb)2(2,5-tdc)(2,5-Htdc)2]·2H2O}n (1), {[Zn2(tpeb)2(1,4-ndc)(1,4-Hndc)2]·2.6H2O}n (2), and {[Zn2(tpeb)2(2,3-ndc)2]·H2O}n (3) (tpeb = 1,3,5-tri-4-pyridyl-1,2-ethenylbenzene, 2,5-tdc = 2,5-thiophenedicarboxylic acid, 1,4-ndc = 1,4-naphthalenedicarboxylic acid, and 2,3-ndc = 2,3-naphthalenedicarboxylic acid) were prepared from reactions of Zn(NO3)2·6H2O with tpeb and 2,5-H2tdc, 1,4-H2ndc, or 2,3-H2ndc under solvothermal conditions. Compound 1 has a two-dimensional (2D) grid-like network formed from bridging 1D [Zn(tpeb)]n chains via 2,5-tdc dianions. 2 and 3 possess similar one-dimensional (1D) double-chain structures derived from bridging the [Zn(tpeb)]n chains via pairs of 1,4-ndc or 2,3-ndc ligands. The solid-state, visible emission by 1–3 was quenched by Cr3+, CrO42–, and Cr2O72– ions in water with detection limits by the most responsive complex 3 of 0.88 ppb for Cr3+ and 2.623 ppb for Cr2O72– (pH = 3) or 1.734 ppb for CrO42– (pH = 12). Thes...

Luminescent Zn(II) Coordination Polymers for Highly Selective Sensing of Cr(III) and Cr(VI) in Water.

Recent developments and emerging directions in ion chromatography.

The potential role of ascorbic acid (AA) in biological systems has stimulated wide, multidisciplinary interest in this compound. Its determination is of interest in many fields (e.g., food, clinical, plant or pharmaceutical analysis). In the past few years, many methods, based on different analytical techniques, have been developed for the determination of AA and its oxidation product, dehydroascorbic acid (DHA). This review aims to make clear the differences, the progress, and the advantages and the disadvantages of individual approaches using high-performance liquid chromatography (HPLC). We discuss HPLC methods for the determination of AA and DHA from the points of view of separation mechanism and detection technique. Stability of these analytes is a key issue in obtaining reliable method validation, so we also included this aspect in the discussion.

HPLC methods for simultaneous determination of ascorbic and dehydroascorbic acids

Determination of bromide, bromate and other anions with ion chromatography and an inductively coupled plasma mass spectrometer as element-specific detector.

On-line thermal lens spectrometric detection of Cr(III) and Cr(VI) after separation by ion chromatography

Effect of organic solvents in the on-line thermal lens spectrometric detection of chromium(III) and chromium(VI) after ion chromatographic separation.

Determination of bisphosphonates by ion chromatography–inductively coupled plasma mass spectrometry

Analyte-stationary phase interactions in ion-exclusion chromatography

Milko Novič

Papers

Determination of bromide, bromate and other anions with ion chromatography and an inductively coupled plasma mass spectrometer as element-specific detector.

On-line thermal lens spectrometric detection of Cr(III) and Cr(VI) after separation by ion chromatography

Effect of organic solvents in the on-line thermal lens spectrometric detection of chromium(III) and chromium(VI) after ion chromatographic separation.

Determination of bisphosphonates by ion chromatography–inductively coupled plasma mass spectrometry

Analyte-stationary phase interactions in ion-exclusion chromatography