Results 21 to 30 of about 132 (112)

Analysis of Some Trace Metals in Fish Species after Preconcentration with Congo Red on Amberlite XAD‐7 Resin by Flame Atomic Absorption Spectrometry

Journal of Chemistry, Volume 2016, Issue 1, 2016., 2016
A new procedure for separation and preconcentration of trace amounts of Cu(II), Ni(II), Fe(III), Zn(II), Cr(III), Cd(II), and Pb(II) in fish samples was proposed. The procedure is based on the adsorption of these metal ions on the column of Amberlite XAD‐7 as congo red complexes prior to their determination by flame atomic absorption spectrometry (FAAS)
Güzin Alpdoğan, Nevim San, Şule Dinç Zor, Daryoush Afzali   +3 more
wiley   +1 more source

Sensing Heavy Metals Using Mesoporous‐Based Optical Chemical Sensors

Journal of Nanomaterials, Volume 2013, Issue 1, 2013., 2013
Heavy metal pollution is one of the more serious environmental problems; therefore, there is a constant demand for the development of new analytical tools for its monitoring. An optical chemical sensor represents a good alternative to classical instrumental methods. The mesoporous materials used in optical chemical sensors’ fabrications have properties
Špela Korent Urek, Nina Frančič, Matejka Turel, Aleksandra Lobnik, Pathik Kumbhakar   +4 more
wiley   +1 more source

Use of Functionalized Resin for Matrix Separation and Trace Elements Determination in Petroleum Produced Formation Water by Inductively Coupled Plasma Mass Spectrometry

International Scholarly Research Notices, Volume 2012, Issue 1, 2012., 2012
This work approaches the development of a procedure for separation and determination of five trace metals (Co, Cd, Pb, Ni, and Cu) from petroleum produced formation water. This procedure uses a styrene divinyl‐benzene polymeric resin modified with 4‐(5′‐bromo‐2′‐tiazolilazo) orcinol, and the determination was performed by inductively coupled plasma ...
Ricardo Erthal Santelli, Aline Soares Freire, Eliane Padua Oliveira, Valfredo Azevedo Lemos, Cléber Galvão Novaes, Marcos Almeida Bezerra, A. Angioni, A. M. Haji Shabani, D. Kara, I. Lavilla   +9 more
wiley   +1 more source

Complex formation in a liquid-liquid extraction-chromogenic system for vanadium(IV)

Open Chemistry, 2019
The azo dye 4-(2-thiazolylazo)orcinol (TAO) and the cationic ion-pair reagent 2,3,5-triphenyl-2H-tetrazolium chloride (TTC) were examined as constituents of a water-chloroform extraction-chromogenic system for vanadium(IV).
Gavazov Kiril B., Delchev Vassil B., Milcheva Nikolina P., Toncheva Galya K.   +3 more
doaj   +1 more source

Competitive Spectrophotometric Study of Copper, Zinc and Cadmium With 18C6 Using TAR as a Colorimetric Complexing Agent in Methanol [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 1998
A Competitive spectrophotometric method has been used for the study of complexation between Cu2+, Zn2+ and Cd2+ (M) and 18-crown-6(18C6, B) in methanol using 4-(2-thiazolylazo) resorcinol (TAR, HL) as the colorimetric complexant.
Gholam Hossein Rounaghi, Mohammad Saeed Hosseini, Ebrahim Ghiamati   +2 more
doaj  

Emission‐based sensing of cobalt (II) and vitamin B12 via a bis‐indole derivative

Luminescence, Volume 39, Issue 8, August 2024.
In this study, a newly synthesized bis‐indole derivative has been successfully used in the analysis of both ionic cobalt and vitamin B12. The fluorescent bis‐indole ligand surrounds cobalt ions and acts similarly to the corrin ring in the structure of vitamin B12 in nature.
Taskin Mumcu, Serkan Oncuoglu, Cevher Gundogdu Hizliates, Kadriye Ertekin   +3 more
wiley   +1 more source

Adsorption of 1-(2-Thiazolylazo)-2-Naphthol on Amberlite XAD-7 and Silica Gel: Isotherms and Kinetic Studies

Journal of the Brazilian Chemical Society, 2014
The reagent 1-(2-thiazolylazo)-2-naphtol (TAN) has been extensively used in solid-phase extraction without a critical evaluation of the adsorption process. In this work, the adsorption of TAN onto XAD-7 and silica gel has been investigated and the experimental equilibrium data were fitted to the Langmuir, Freundlich and Dubinin-Radushkevich models ...
Anaia, Grazielle C., Freitas, Patricia A. M., Suárez-Iha, Maria E. V., Rocha, Fábio R. P.   +3 more
openaire   +3 more sources

Relationship of Thermostability and Binding Affinity in Metal‐binding WW‐Domain Minireceptors

ChemBioChem, Volume 25, Issue 4, February 16, 2024.
Hold on tight. Three metal‐binding WW domains with significantly different thermal stabilities, were designed to investigate the relationship between thermostability and metal binding affinity. We show that the metal‐binding affinities for Ni(II), Zn(II) and Cu(II) correlate with the thermostabilities of the WW domains and attribute this to enhanced ...
Truc Lam Pham, Marcos R. Conde González, Sunnatullo Fazliev, Agi Kishore, Peter Comba, Franziska Thomas   +5 more
wiley   +1 more source

Mono- and Binuclear Complexes in a Centrifuge-Less Cloud-Point Extraction System for the Spectrophotometric Determination of Zinc(II)

Molecules
The hydrophobic reagent 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR) was investigated as part of a cloud-point extraction (CPE) system for the spectrophotometric determination of Zn(II). In the system, complexes with different stoichiometries, including 1:
Kiril B. Gavazov, Petya V. Racheva, Antoaneta D. Saravanska, Fatma Genc, Vassil B. Delchev   +4 more
doaj   +1 more source

Spectrophotometric determination of uranium using 2-(2- Thiazolylazo)-p-Cresol (TAC) in the presence of surfactants

Journal of the Brazilian Chemical Society, 1999
A sensitive and selective spectrophotometric method is proposed for the rapid determination of uranium using 2-(2- Thiazolylazo)-p-Cresol (TAC). The reaction between TAC and uranium (VI) is instantaneous at pH 6.5 and the absorbance remains stable for ...
Teixeira Leonardo Sena Gomes, Costa Antonio Celso Spínola, Ferreira Sérgio Luís Costa, Freitas Maria de Lourdes, Carvalho Marcelo Souza de   +4 more
doaj