Browsing by Subject "chemical analysis"
Now showing items 21-40 of 40
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Oligoacetic acid characterization by isocratic and linear salt gradient anion-exchange chromatography
(2001)A homologous series of four oligomers of acetic acid (namely acetic acid, succinic acid, tricarballylic acid, and tetracarboxylic acid) is characterized using isocratic and linear salt gradient anion-exchange chromatography. ...
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Open-tubular capillary electrochromatography using a polymeric surfactant coating
(2003)A stable polyelectrolyte multilayer (PEM) coating was investigated for use in open-tubular capillary electrochromatography (o-CEC). In this approach, the PEM consisted of the cationic polymer of a quaternary ammonium salt, ...
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p-phenylenecarbenonitrene and its halogen derivatives: How does resonance interaction between a nitrene and a carbene center affect the overall electronic configuration?
(2001)A series of para-conjugatively coupled phenylenecarbenonitrenes {(4-nitrenophenyl)methylene (3a), (4-nitrenophenyl)fluoromethylene (3b), (4-nitrenophenyl)chloromethylene (3c), and (4-nitrenophenyl)bromomethylene (3d)} were ...
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Quantitative description and local structures of trivalent metal ions Eu(III) and Cm(III) complexed with polyacrylic acid
(2008)The trivalent metal ion (M(III) = Cm, Eu)/polyacrylic acid (PAA) system was studied in the pH range between 3 and 5.5 for a molar PAA-to-metal ratio above 1. The interaction was studied for a wide range of PAA (0.05 mg ...
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Redox chemistry of sulphate and uranium in a phosphogypsum tailings dump
(2010)The present study aims to assess the effect of redox conditions existing within the tailings dump on the stability of phosphogypsum (e.g. sulphate reduction) and uranium(VI). Phosphogypsum sampling and in-situ measurements ...
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The remarkable effect of oxygen on the N2 selectivity of water catalytic denitrification by hydrogen
(2007)The selective catalytic reduction of nitrates (NO3-) in pure water toward N2 formation by the use of gaseous H2 and in the presence of O2 (air) at 1 atm total pressure and 25°C has been investigated over Pd-Cu supported ...
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A scale-up field experiment for the monitoring of a burning process using chemical, audio, and video sensors
(2014)Fires are becoming more violent and frequent resulting in major economic losses and long-lasting effects on communities and ecosystems
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Studies on the interaction of olive cake and its hydrophylic extracts with polyvalent metal ions (Cu(II), Eu(III)) in aqueous solutions
(2009)The paper presents and discusses the chemical affinity of two different forms of natural organic matter (e.g. in solid (SOM) and soluble form (DOM)) for Cu2+ and Eu3+ ions. In the this study SOM is represented by olive ...
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A study of volatile organic compounds evolved from the decaying human body
(2005)Two men were found dead near the island of Samos, Greece, in the Mediterranean sea. The estimated time of death for both victims was 3-4 weeks. Autopsy revealed no remarkable external injuries or acute poisoning. The exact ...
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Substitution at C-4 in 3,5-disubstituted 4H-1,2,6-thiadiazin-4-ones
(2012)3,5-Diaryl-4H-1,2,6-thiadiazin-4-ones react with NaBH 4 to give the 3,5-diaryl-4H-1,2,6-thiadiazin-4-ols and with MeLi to give 4-methyl-3,5-diaryl-4H-1,2,6-thiadiazin-4-ols. The latter dehydrate with p-toluenesulfonic acid ...
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Article
Superhelices of poly[2-(acetoacetoxy)ethyl methacrylate]
(2004)Poly[2-(acetoacetoxy) ethyl methacrylate] (PAEMA) homopolymers were found to self-assemble into hierarchical superstructures, that is, double-stranded helical tubes of either screw sense (scanning force microscopy). Both ...
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Synthesis and aqueous solution properties of multinuclear oxo-bridged vanadium(IV/V) complexes
(2000)Reaction of the multifunctional phenolic ligands 2,5-bis[N,N-bis(carboxymethyl)aminomethyl]hydroquinone (H6cahq), 2,2'-bis[N,N-bis(carboxymethyl)aminomethyl]-4,4'-isopropylidenedi phenol (H6capd), 2,2',2''-tris[N,N-bis(c ...
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Synthesis and characterization of electrolytic amphiphilic model networks based on cross-linked star polymers: Effect of star architecture
(2002)Amphiphilic model networks of a new structure, that of cross-linked "in-out" star copolymers, were synthesized by a one-pot preparation using group-transfer polymerization. The networks comprised hydrophobic methyl ...
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Synthesis, characterization and modeling of ABC triblock terpolymers: The effect of block sequence
(2002)Four equimolar terpolymers comprising ten units from each of the monomers methoxy hexa(ethylene glycol) methacrylate (HEGMA), 2-(dimethylamino)ethyl methacrylate (DMAEMA) and methyl methacrylate (MMA) were prepared by group ...
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Synthetic analogues for oxovanadium(IV) - Glutathione interaction: An EPR, synthetic and structural study of oxovanadium(IV) compounds with sulfhydryl-containing pseudopeptides and dipeptides
(1999)Valuable analogues of the VIVO2+ - glutathione complex have been synthesized and characterized. The reaction of [VIVO(CH3COO)2(phen)] (phen = 1,10-phenanthroline) with the sulfhydryl-containing pseudopeptides (scp) ...
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Thermoelectric properties and site-selective Rb+/K+ distribution in the K2-xRbxBi8Se13 series
(2003)β-K2Bi8Se13 possesses promising thermoelectric properties whereas Rb2Bi8Se13 does not. The formation of solid solutions between these two compounds was attempted to study the alkali metal distribution in the structure and ...
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Thorium determination in water samples by liquid scintillation counting after its separation by cloud point extraction
(2011)The aim of this study is the separation and pre-concentration of thorium from aqueous solutions by cloud point extraction (CPE) and its the radiometric determination by liquid scintillation counting (LSC). For CPE, tributyl ...
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Trace detection of endogenous human volatile organic compounds for search, rescue and emergency applications
(2015)Since Pauling's paper in the 1970s, interest has increased in volatile organic compounds (VOCs) released from different bio-fluids, such as blood and urine. A number of VOCs reflect internal biochemical pathways occurring ...
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Use of chiral amino acid ester-based ionic liquids as chiral selectors in CE
(2013)In this study, the applicability of a chiral ionic liquid (CIL) as the sole chiral selector in CE was investigated for the first time. In particular, five amino acid ester-based CILs were synthesized and used as additives ...
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Vanadium chemistry and biochemistry of relevance for use of vanadium compounds as antidiabetic agents
(1995)The stability of 11 vanadium compounds is tested under physiological conditions and in administration fluids. Several compounds including those currently used as insulin-mimetic agents in animal and human studies are stable ...