Results 191 to 200 of about 36,252 (237)
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Aerosol preconcentration on a liquid electrode
Talanta, 1981Electrostatic preconcentration of a dried aerosol is achieved with a water electrode. The system is found to show similar trapping characteristics to those given by wire electrodes, but the subsequent introduction of collected material into a flame atomizer is easier, merely requiring aspiration of the electrode solution after the trapping cycle is ...
P A, Michalik, R, Stephens
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Microfluidics and Nanofluidics, 2012
A nanofluidic preconcentrator with the capability of rapidly preconcentrating and precisely positioning protein bands in multiple microchannels has been developed for highly sensitive detection of biomolecules. A novel electrical resistive network model is developed to guide the design of the nanofluidic preconcentrator which consists of a PDMS slab ...
Kung-Bin Sung +3 more
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A nanofluidic preconcentrator with the capability of rapidly preconcentrating and precisely positioning protein bands in multiple microchannels has been developed for highly sensitive detection of biomolecules. A novel electrical resistive network model is developed to guide the design of the nanofluidic preconcentrator which consists of a PDMS slab ...
Kung-Bin Sung +3 more
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1996
Despite the great strides forward in analytical instrumentation that have been made in the last decade, the analyst working in the fields of potable water analysis and environmental analysis of non-saline and saline waters finds that, frequently, the equipment has insufficient sensitivity to be able to detect the low concentrations of substances ...
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Despite the great strides forward in analytical instrumentation that have been made in the last decade, the analyst working in the fields of potable water analysis and environmental analysis of non-saline and saline waters finds that, frequently, the equipment has insufficient sensitivity to be able to detect the low concentrations of substances ...
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Journal of Chromatography A, 2008
Zirconia (ZrO(2)) has strong Lewis acid sites which have an affinity for the strongly electronegative phosphonate group of organo-phosphates. To investigate whether this affinity can be used for selective preconcentration, the retention of methyl, ethyl, and propylphosphonic acid (MPA, EPA and PPA) and inorganic anion matrix components on ZrO(2) was ...
Ting, Zhou, Charles A, Lucy
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Zirconia (ZrO(2)) has strong Lewis acid sites which have an affinity for the strongly electronegative phosphonate group of organo-phosphates. To investigate whether this affinity can be used for selective preconcentration, the retention of methyl, ethyl, and propylphosphonic acid (MPA, EPA and PPA) and inorganic anion matrix components on ZrO(2) was ...
Ting, Zhou, Charles A, Lucy
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Analytica Chimica Acta, 1977
Abstract Trace elements such as Ag, Au, Bi, Cd, Co, Cu, Fe, Ga, In, Ni, Pb, Pd and Tl, can be preconcentrated with recoveries of better than 95% from high-purity manganese if the sample is coated with a thin layer of mercury before its dissolution in HCl to a small residue.
E. Jackwerth, J. Messerschmidt, R. Höhn
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Abstract Trace elements such as Ag, Au, Bi, Cd, Co, Cu, Fe, Ga, In, Ni, Pb, Pd and Tl, can be preconcentrated with recoveries of better than 95% from high-purity manganese if the sample is coated with a thin layer of mercury before its dissolution in HCl to a small residue.
E. Jackwerth, J. Messerschmidt, R. Höhn
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Epitachophoretic preconcentration of proteins
2021In this work, we present a developed method for preconcentration of standards of proteins cytochrome c, myoglobin, and hemoglobin. Firstly, the electrolyte system was selected and optimized to provide low analysis time, narrow shape of the protein zone, and eliminate overheating at the center of the device.
Hrušková, H. (Helena) +2 more
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Preconcentration and determination of ultratraces of lead and bismuth
Talanta, 1986The recovery and preconcentration of Pb(II) and Bi(III) by coupling ion-exchange and precomplexation with 1,2-dihydroxy-3,5-benzenedisulphonic acid and 3,3',4'-trihydroxyfuchsone-2''-sulphonic acid has been investigated. Metal recoveries at 0.1-mg l . concentrations are better than 99% in the presence of cationic, anionic and non-ionic detergents, or ...
C, Sarzanini +4 more
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The on-line preconcentration of nanoparticles in electromigration techniques
Journal of Chromatography A, 2019Electromigration techniques have recently emerged as an alternative analytical tool for nanoparticles characterization. Due to the high throughput capability and separation efficiency their application for detection/quantification of nanomaterials in samples of various origin has attracted much attention. While the electromigration techniques are known
Szymon, Dziomba +2 more
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Preconcentration of aluminium by micellar-enhanced ultrafiltration
Analytica Chimica Acta, 1993Abstract Traces of aluminium were preconcentrated in water samples by forming a complex with lumogallion, and successfully accumulated in the micellar phase obtained from cationic or non-ionic surfactants and filtered through 10 000 molecular weight cut-off ultrafiltration membranes.
M. de la Guardia +4 more
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Online microchannel preconcentrator for carbofuran detection
Journal of Environmental Science and Health, Part B, 2013A simple and rapid online microchannel preconcentrator coupled with an amperometric detection for the analysis of carbofuran using polyethylene glycol coated onto magnetic particle (PEG-magnetic particles) sorbents was developed. This simple-to-prepare microchannel preconcentrator used an external magnet to retain the PEG-magnetic particle sorbents ...
Charinrat, Siritham +3 more
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