Results 101 to 110 of about 20,968 (228)

Development of Zeolite Imidazole Framework-Based Adsorbent for Effective Microextraction and Preconcentration of Histamine in Food Samples

Foods
This study is the first to focus on the preconcentration and determination of histamine (HIS) in food samples using zeolite imidazole frameworks (ZIFs) on a solid-phase microextraction (SPME) platform.
Abdullah Khalid Omer, Hossein Tajik, Rahim Molaei, Mehran Moradi   +3 more
doaj   +1 more source

PREPARO DE AMOSTRAS ASSISTIDO POR CAMPO ELÉTRICO: FUNDAMENTOS, AVANÇOS, APLICAÇÕES E TENDÊNCIAS

Química Nova, 2015
Sample preparation is commonly considered a key step to achieve selective, sensitive, and reliable chemical analyses, particularly those involving complex matrices. Although the application of electric fields to improve the speed and efficiency of sample
Camila D. M. Campos, Richard P. S. de Campos, José A. Fracassi da Silva, Dosil P. Jesus, Ricardo M. Orlando   +4 more
doaj   +1 more source

A cryogen-free refrigerating preconcentration device for the measurement of C2 to C4 hydrocarbons in ambient air

, 2011
A cryogen-free refrigerating preconcentration device for the measurement of C2 to C4 hydrocarbons in ambient airA cryogen-free refrigerating preconcentration device for the enrichment of trace amounts of highly volatile organic compounds in the ...
Shen, Zheng, Wu, Dapeng, Peng, Hong, Guan, Yafeng, 关亚风, Wang, JianWei   +5 more
core   +1 more source

On-line preconcentration techniques in capillary electrophoresis

, 2009
Tato bakalářská práce se zabývá kapilární elektroforézou a technikami, kterými lze zvýšit citlivost elektroforézy, tzv. prekoncentračními technikami. Důvod, proč se prekoncentrace provádějí je nízká koncentrační citlivost, která je, mimo jiné, způsobená ...
Tvarůžková, Eva
core   +1 more source

Determination of iron in natural and mineral waters by flame atomic absorption spectrometry [PDF]

Journal of the Serbian Chemical Society, 2004
Simple methods for the determination of Fe in natural and mineral waters by flame atomic absorption spectrometry (AAS) are suggested. The results of the investigation of selectivity of the proposed AAS method proved that this procedure is not affected by
ROLANDAS KAZLAUSKAS, LAURA STEPONENIENE, STASYS TAUTKUS   +2 more
doaj  

Determinação de cádmio em tabaco por extração em fase sólida acoplado em linha ao espectrômetro de absorção atômica em chama [PDF]

, 2009
TCC (graduação) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Curso de Química.Neste estudo foi determinado cádmio em amostras de cigarro utilizando a técnica de extração em fase sólida associada a um sistema para a ...
Rios, Fernanda de J. de Araújo
core  

A sensitive method for atmospheric sulfur dioxide determination by reaction cell inductively coupled plasma mass spectrometer

Royal Society Open Science
A sensitive method for sulfur dioxide (SO2) determination was developed with reaction cell inductively coupled plasma mass spectrometer (ICP-MS) by preconcentrating SO2 from gas samples to solutions.
Qi-Xuan Sun, Bo Li, Xiao-Ping Kong, Shang-Qing Zhang   +3 more
doaj   +1 more source

Preconcentration-enhanced electrochemical detection of paraoxon in food and environmental samples using reduced graphene oxide-modified disposable sensors

Organophosphates, such as paraoxon, are widely used as insecticides in agriculture, making their detection in environmental and food samples crucial due to their high toxicity.
Elisa S Orth (24108516), Luiz H Marcolino-Júnior (24108519), Márcio F Bergamini (24024483), Craig Banks (23881992), Cristiane Kalinke (10381336), Maurício AP Papi (24108513), Luís MC Ferreira (24108510), Rafael L Zamboni (24108507)   +7 more
core  

Membrane-Based Protein Preconcentration Microfluidic Devices [PDF]

, 2006
Interest in microchip capillary electrophoresis (CE) is growing due to the rapid analysis times provided and small sample input requirements. However, higher-concentration samples are typically needed because of the small (~pL) detection volumes in these
Li, Yi
core  

Economic evaluation of preconcentration in production of ethanol from dilute sugar solutions

, 1989
The economic feasibility of preconcentrating dilute sugar solutions prior to fermentation is investigated. Two methods, evaporation and reverse osmosis, are compared.
Zacchi, Guido, Axelsson, Anders
core   +2 more sources