Results 61 to 70 of about 6,944 (194)

DEVELOPMENT OF CLOUD POINT EXTRACTION-SCANOMETRY, FOR THE PRECONCENTRATION AND DETERMINATION OF COLORLESS SPECIES: APPLICATION FOR THE DETERMINATION OF PHENYLALANINE

Química Nova
In this study, a simple, fast, portable, environment-friendly and inexpensive method, CPE-scanometry, is applied for the determination of Phenylalanine (Phe) amino acid.
Ardeshir Shokrollahi, Masuod Refahi
doaj   +1 more source

Separation and preconcentration trace amounts of gold by using modified organo nanoclay closite 15A

Química Nova, 2010
The application of organo nanoclay 5-(4-dimethylamino-benzylidene) rhodanine-immobilized as a new, easily prepared, and stable solid sorbent for preconcentration trace amounts of Au(III) ions in aqueous solution is presented. The sorption of Au(III) ions
Sayed Zia Mohammadi, Naimeh Seifollahi, Daryoush Afzali   +2 more
doaj   +1 more source

preconcentration coefficient

, 2014
Citation: 'preconcentration coefficient' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.P04804 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms. Requests
openaire   +1 more source

Preconcentration Modeling for the Optimization of a Micro Gas Preconcentrator Applied to Environmental Monitoring.

Procedia Chemistry, 2009
AbstractThis paper presents the complete modeling of the preconcentration cycle for the optimization of a Micro Gas Preconcentrator applied to atmospheric pollution monitoring. The particularity of this modeling is based on the fact that it includes all equations governing not only the adsorption and desorption phenomena but also the detection phase ...
Camara, El Hadji Malick, Breuil, Philippe, Pijolat, Christophe   +2 more
openaire   +2 more sources

Electrochemical Detection of Heavy Metal (Pb Ions) and Pharmaceutical Waste (Ciprofloxacin) in Very Low Concentration Using β‐NaFeO2

Electrochemical Science Advances, Volume 6, Issue 4, August 2026.
Organic and inorganic pollutants detection in waste water using β‐NaFeO2 and inorganic pollutants detection in waste water using β‐NaFeO2. ABSTRACT Electrochemical techniques as a point of care analysis are drawing the researcher's attention, especially in the case of heavy metal ions (HMIs) detection. In this research, β‐NaFeO2 was synthesized using a
Md. Sahadat Hossain, Sumaya Tabassum, Israt Jahan Lithi, Priya Paul, Md. Kawsar, Md. Kawcher Alam, Md. Farid Ahmed, Samina Ahmed   +7 more
wiley   +1 more source

Determinação espectrofotométrica de alumínio em concentrados salinos utilizados em hemodiálise empregando pré-concentração em fluxo Spectrophotometric aluminium determination in high salts concentrations solution used in hemodyalisis emploing preconcentration in flow injection

Química Nova, 2002
An automatic flow injection procedure for spectrophotometric aluminium determination in purified water and solutions containing high salts concentrations used for hemodyalisis treatment was developed.
Maria do Socorro Silva Pereira, Boaventura Freire dos Reis   +1 more
doaj   +1 more source

Proteolytic Activity of Commercial Thermophilic Starter Cultures and Changes in Protein Fractions and Free Amino Acids in Organic and Conventional Fermented Milk

Food Science &Nutrition, Volume 14, Issue 8, August 2026.
This study evaluated the impact of milk origin (organic vs. conventional) and starter culture composition on LAB proteolytic activity, and related changes in non‐protein nitrogen compounds in fermented milk. Results provide insight into protein hydrolysis, individual protein fractions and free amino acids in organic and conventional milk after ...
Stefanija Steinweg, Jelena Zagorska, Kristine Majore, Vitalijs Komasilovs, Vitalijs Radenkovs, Inga Ciprovica   +5 more
wiley   +1 more source

Ionic Liquid—Solidified Floating Organic Drop Microextraction for the Preconcentration of Lead in Environmental Water Samples Prior to Its Determination with Electrothermal Atomic Absorption Spectrometry

Molecules
This research investigates the utilization of an ionic liquid combination of solidified floating organic drop micro-extraction (IL-SFODME) to augment the concentration of trace amounts of lead, working as a preliminary stage before electrothermal atomic ...
İlknur Durukan, Barış Yildiz
doaj   +1 more source

Preconcentration of Co, Ni, Cd and Zn on naphthalene–2,4,6-trimorpholino-1,3,5-triazin adsorbent and flame atomic absorption determination [PDF]

Journal of the Serbian Chemical Society, 2010
A preconcentration method was developed for the determination of trace amounts of Co, Ni, Cd and Zn by atomic absorption spectrometry. The method is based on the retention of the metal cations by naphthalene–2,4,6-trimorpholino-1,3,5-triazin adsorbent in
TAYYEBEH MADRAKIAN, MOHAMMAD ALI ZOLFIGOL, FATHEMEH ABOULGHAZI   +2 more
doaj  

Green and Rapid Determination of Phthalates in Mineral Water From Virgin and Recycled PET Bottles

Journal of Mass Spectrometry, Volume 61, Issue 8, August 2026.
ABSTRACT This study investigates the presence and quantification of phthalates released into mineral waters from virgin and recycled polyethylene terephthalate (PET) bottles. A green, solvent‐free analytical method based on solid‐phase microextraction (SPME) coupled with gas chromatography–mass spectrometry (GC/MS) was developed and validated to detect
Claudia Lino, Serena Indelicato, David Bongiorno, Fabio D'Agostino, Giuseppe Avellone   +4 more
wiley   +1 more source