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Electrochemically aminated glassy carbon electrode for simultaneous determination of hydroquinone and catechol

25-Nov-2015 | xiuyun wang; Min Xi; Mengmeng Guo; Fangmeng Sheng; Guang Xiao; Shuo Wu; Shunichi Uchiyama; Hiroaki Matsuura, Analyst, 2015

In this contribution, a very simple and reliable strategy based on the easy modification of glassy carbon electrode (GCE) by pre-electrolyzing GCE in ammonium carbamate aqueous solution was employed for the simultaneous determination of hydroquinone (HQ) and catechol (CC). Compared with bare GCE, ...


Sustainability, Vol. 7, Pages 15302-15318: Adsorptive Removal of Reactive Black 5 from Wastewater Using Bentonite Clay: Isotherms, Kinetics and Thermodynamics

18-Nov-2015 | Amin, Muhammad Tahir; Alazba, Abdulrahman Ali; Shafiq, Muhammad, Sustainability, 2015

The studies of the kinetics and isotherms adsorption of the Reactive Black 5 (RB5) onto bentonite clay were explored in a batch study in a laboratory. The maximum RB5 adsorption conditions of bentonite clay were optimized such as shaking speed (100 rpm), temperature (323 K), pH (10), contact ...


Column preconcentration and electrothermal atomic absorption spectrometric determination of rhodium in some food and standard samples

17-Nov-2015 | Mohammad Ali Taher, Fatemeh Pourmohammad, Hamid Fazelirad, Journal of Separation Science, 2015

In the present work, an electrothermal atomic absorption spectrometric method has been developed for the determination of ultra‐trace amounts of rhodium after adsorption of its 2‐(5‐bromo‐2‐pyridylazo)‐5‐diethylaminophenol/tetraphenylborate ion associated complex at the surface of alumina. ...


Ultrasound-assisted chiral derivatization of etodolac with (1R)-(-)-menthyl chloroformate for the determination of etodolac enantiomers

15-Nov-2015 | Author(s): Yan Jin, Jing Zhao, Lydia Rhyman, Ponnadurai Ramasami, Yujin Shin, Kyung Min Jeong, Jeongmi Lee, Arabian Journal of Chemistry, 2015

Publication date: Available online 11 November 2015 Source:Arabian Journal of Chemistry Author(s): Yan Jin, Jing Zhao, Lydia Rhyman, Ponnadurai Ramasami, Yujin Shin, Kyung Min Jeong, Jeongmi Lee This study presents the first report of an ultrasound-assisted derivatization ...


Analysis of Homogeneous Water Oxidation Catalysis with Collector–Generator Cells

12-Nov-2015 | Benjamin D. Sherman; Matthew V. Sheridan; Kyung-Ryang Wee; Na Song; Christopher J. Dares; Zhen Fang; Yusuke Tamaki; ..., Inorganic Chemistry, 2015

A collector–generator (C–G) technique has been applied to determine the Faradaic efficiencies for electrocatalytic O2 production by the homogeneous water oxidation catalysts Ru(bda)(isoq)2 (1; bda = 2,2′-bipyridine and isoq = isoquinoline) and [Ru(tpy)(bpz)(OH2)]2+ (2; tpy = ...


Chiroptical Probing of Lanthanide‐Directed Self‐Assembly Formation Using btp Ligands Formed in One‐Pot Diazo‐Transfer‐Deprotection‐'Click' Reaction from Chiral Amines

11-Nov-2015 | Thorfinnur Gunnlaugsson, Joseph P Byrne, Miguel Martínez-Calvo, Robert D Peacock, Chemistry - A European Journal, 2015

A series of enantiomeric btp‐containing ligands [2,6‐bis(1,2,3‐triazol‐4‐yl)pyridines] were synthesized via a one‐pot two‐step copper‐catalyzed amine‐alkyne 'click' reaction. The Eu(III) and Tb(III) directed self‐assembly formation of these ligands was studied in CH3CN by monitoring their ...


Determination of the thermodynamic activities of LiF and ThF4 in the LixTh1−xF4−3x liquid solution by Knudsen effusion mass spectrometry

10-Nov-2015 | Elisa Capelli; Ondřej Beneš; Jean-Yves Colle; Rudy J. M. Konings, Physical Chemistry Chemical Physics, 2015

Knudsen effusion mass spectrometry (KEMS) has been used to investigate the vapour pressure over the molten LiF–ThF4 salt and determine the thermodynamic activity of LiF and ThF4 in the liquid solution. As part of the study, the vaporization of pure LiF and pure ThF4 was examined and the results ...


Ultrapreconcentration and determination of organophosphorus pesticides in water by solid‐phase extraction combined with dispersive liquid–liquid microextraction and high‐performance liquid chromatography

10-Nov-2015 | Junhua Chen, Guangming Zhou, Hongmei Cheng, Jie Shen, Yi Gao, Guilong Peng, Journal of Separation Science, 2015

Solid‐phase extraction coupled with dispersive liquid–liquid microextraction was developed as an ultrapreconcentration method for determination of four organophosphorus pesticides (isocarbophos, parathion‐methyl, triazophos and fenitrothion) in water samples. The analytes considered in this ...


Keto–Enol Tautomeric Equilibrium of Acetylacetone Solution Confined in Extended Nanospaces

10-Nov-2015 | Takehiko Tsukahara; Kyosuke Nagaoka; Kyojiro Morikawa; Kazuma Mawatari; Takehiko Kitamori, Journal of Physical Chemistry B, 2015

We aim to clarify the effects of size confinement, solvent, and deuterium substitution on keto–enol tautomerization of acetylacetone (AcAc) in solutions confined in 10–100 nm spaces (i.e., extended nanospaces) using 1H NMR spectroscopy. The keto–enol equilibrium constants of AcAc (KEQ = ...


Carbon Stable Isotope Analysis of Methylmercury Toxin in Biological Materials by Gas Chromatography Isotope Ratio Mass Spectrometry

10-Nov-2015 | Jeremy Masbou; David Point; Gaël Guillou; Jeroen E. Sonke; Benoit Lebreton; Pierre Richard, Analytical Chemistry, 2015

A critical component of the biogeochemical cycle of mercury (Hg) is the transformation of inorganic Hg to neurotoxic monomethylmercury (CH3Hg). Humans are exposed to CH3Hg by consuming marine fish, yet the origin of CH3Hg in fish is a topic of debate. The carbon stable isotopic composition (δ13C) ...


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