Reactions and applications of trans-1,2-epoxy-(Z,E)-cyclododeca-5,9-diene
Published in Chemical Papers
Spectrophotometric determination of nickel(II) in different samples by complexation with some triazolylazo dyes
Published in Chemical Papers
A new sensitive spectrophotometric method for the determination of nickel(II) with 3-(2-hydroxy-5-acetyl-(L1),-5-ethoxycarbonyl-(L2),-5-methyl-(L3),-5-formyl-(L4),-5-bromophen-1-ylazo)-1,2,4-triazole (L5), and 3-(2,4-dihydroxyphen-1-ylazo)-1,2,4-triazole (L6) in aqueous media containing 40 vol. % methanol has been developed. The method is based on ...
Efficiency of a fixed-bed and a gas-lift three-column reactor for continuous production of ethanol by pectate-and algina...
Published in Chemical Papers
Ethanol-tolerant and thermo-tolerant yeast strain Saccharomyces cerevisiae C11-3 cells immobilized in calcium pectate and calcium alginate gels were used for ethanol fermentation in a three-reactor system with a gradient temperature control. The fermentation process has been tested in a fixed-bed and a gas-lift arrangement. The gas-lift system was ...
Determination of technetium-99 in soils and radioactive wastes using ICP-MS
Published in Chemical Papers
Three methods have been used for the determination of 99Tc in soils and solid radioactive wastes using 99mTc as a yield monitor. In the method one and three the samples were leached in low concentrated nitric and sulphuric acid. Many contaminants were then co-precipitated with Fe(OH)3 in alkali media and Tc in the supernatant was separated using an...
Trace analysis of lead by anodic stripping voltammetry with collection at interdigitated microelectrodes in small-volume...
Published in Chemical Papers
A simple and sensitive electroanalytical method was developed for microvolume trace elements determination. Commercially available interdigitated microelectrodes (IDA) from ALS Japan Inc. based on a thin carbon film technology were used. Anodic stripping voltammetry with collection at IDA was applied. Carbon IDA microbands were coated with a pre-de...
Determination of bioavailable iron in noncontaminated Slovak soils by flame atomic absorption spectrometry
Published in Chemical Papers
A method for the extraction of bioavailable iron from soils from various parts of Slovakia using a buffered diethylenetriaminepentaacetic acid (DTPA) solution was utilized. The extractant consists of 0.005 mol dm−3 DTPA, 0.1 mol dm−3 CaCl2, and 0.1 mol dm−3 triethanolamine with pH of 7.3. DTPA was selected as the chelating agent because it can effe...
Dictionary of Carbohydrates. Edited by P. M. Collins. Second Edition
Published in Chemical Papers
Flame retardant property of nanopowder aerosols toward methane
Published in Chemical Papers
The flame retardant property of aerosols formed from 18 different nanopowders has been studied. The diameter of nanocrystalline powders was determined by XRD and TEM. The concentration of combustible gas was determined by gas chromatography. It was found that ZrO2 nanocrystalline powdered aerosol can effectively retard the burning of CH4. The flame...
Surface modifications of natural clinoptilolite-dominated zeolite for phenolic pollutant mitigation
Published in Chemical Papers
A novel carbonized clinoptilolite-rich tuff was studied for phenol removal from water. Zeolite sample carbonization was accomplished in a plasmachemical reactor (pyrolytic chamber) using several types of waste, here specifically waste vegetable residues and starch. Phenol adsorption experiments were performed in the batch system. An industrial acti...
Chemistry for the design and better understanding of cement-based materials and composites
Published in Chemical Papers
Macrodefect-free (MDF) materials are one example of “hot topics” in the field of cement-based materials and composites exerting new possibilities of the exploitation of added value. These are formed through cross-linking reactions of atoms at the interfaces of cement grains and functional polymers, when medium pressure and twin-rolling procedure ar...
