Results 181 to 190 of about 36,252 (237)

Determination of Finger Optical Properties Using an Integrating Sphere. [PDF]

Sensors (Basel)
Wagner M, Beutel B, Naglic P, Fugger O, Foschum F, Kienle A.   +5 more
europepmc   +1 more source

Advancements in Noninvasive Volatile Organic Compound Detection: Integrating Stirling Cooling Preconcentration with GC-FID/MS for Quantitative Breath Analysis. [PDF]

ACS Omega
Xu Q, Hu X, Zhong L, Wang Z, Zhao H, Fu J, Cao D, Liu L, Zhang Y, Lang J.   +9 more
europepmc   +1 more source

Surfactant aggregates for preconcentration of trace analytes

Analytical Sciences
openaire   +2 more sources

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Radial sample preconcentration

Lab on a Chip, 2011
In this paper we present a radial sample preconcentration strategy enabled by axisymmetric concentration polarization in a microfluidic chamber on a uniform nanoporous film. Sample analytes are focused into the centre, creating a concentrated plug that is injected vertically into the microfluidic analysis layer.
Brent, Scarff, Carlos, Escobedo, David, Sinton   +2 more
openaire   +2 more sources

Selective preconcentration by temperature manipulation of cascaded micro preconcentrators

TRANSDUCERS 2009 - 2009 International Solid-State Sensors, Actuators and Microsystems Conference, 2009
This article presents a new method for selective preconcentration of target species and the elimination of unwanted ones from a sample mixture. In this approach, the temperature and flow direction of two microfabricated preconcentrators connected in series are controlled according to the boiling points of target species.
B. Alfeeli, M. Agah
openaire   +1 more source

Preconcentration of contaminants in water analysis

Journal of Chromatography A, 2000
Among the environmental areas, in this review attention will be focused on water matrices and both on organic (e.g., pesticides, herbicides, phenols, polycyclic aromatic hydrocarbons), inorganic species and anion pollutants, since these kinds of substances include a wide number of compounds with different physical and chemical properties and different ...
BRUZZONITI, Maria Concetta, SARZANINI, Corrado, MENTASTI, Edoardo   +2 more
openaire   +3 more sources

Electrolytic preconcentration in instrumental analysis

Talanta, 1986
The use of electrolytic deposition as a separation and preconcentration step in trace metal analysis is reviewed. Both the principles and applications of the technique are dealt with in some detail. Electrolytic preconcentration can be combined with a variety of instrumental techniques.
R E, Sioda, G E, Batley, W, Lund, J, Wang, S C, Leach   +4 more
openaire   +2 more sources

An instrumental method of solution preconcentration

Talanta, 1981
Aerosol concentration before atomic-absorption measurement is achieved by use of an electrostatic trapping technique. The effects of various experimental parameters are examined, including those of voltage, trap dimensions, gas flow-rate through the trap and trapping time. It is concluded that the technique offers an inherently clean method of solution
P A, Michalik, R, Stephens
openaire   +2 more sources

Separation and preconcentration

Fresenius' Zeitschrift f�r Analytische Chemie, 1973
A general review is given on separation and pre-concentration methods. Among the various procedures especially chromatography and ion-exchange for separation, and absorption and extraction for preconcentration are discussed in detail.
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Separation and preconcentration of trace substances - III. Flotation as a preconcentration technique

Pure and Applied Chemistry, 1982
Abstract
A. Mizuike, M. Hiraide
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