Güncel Gönderiler: Kimya Bölümü
Toplam kayıt 724, listelenen: 521-540
-
Qualitative analysis of Cu2+, Co2+, and Ni2+ cations using thin-layer chromatography
(Preston Publications Inc, 2004)The M(DEDTC)2 (M = Cu, Co, or Ni) and M(PyDTC)2 (M = Cu or Co) complexes prepared by reactions of sodium diethyldithiocarbamate and ammonium pyrollidinedithiocarbamate with metal (II) nitrates are examined for qualitative ... -
Incorporation of an allene unit into alpha-pinene: Generation of the cyclic allene 2,7,7-trimethylbicyclo[4.1.]octa-2,3-diene and its dimerization
(Amer Chemical Soc, 2004)The reaction of etheral methyllithium with 3,3-dibromo-2,7,7-trimethyl-tricyclo[4.1.1.0.(2,4)] octane (2) was investigated. The generated carbene 12 undergoes intramolecular C-H insertion to provide the tetracyclic hydrocarbon ... -
Complexation studies of some newly synthesized precursors for substituted dibenzo and dibenzodiaza crown ethers
(John Wiley & Sons Inc, 2004)This study represents the synthesis of dibenzo and dibenzodiaza crown ether precursors with various functional groups in good yield by employing four different methods using polar protic and aprotic solvents with high ... -
Phosphonate-based resins for the selective enrichment of uranium(VI)
(Elsevier Science Bv, 1999)Phosphonate-derivatized polystyrene-divinylbenzene-based (PS-DVB) resins have been prepared from chloromethylpolystyrene-divinylbenzene (Cl-CH(2)-PS-DVB) by the Arbuzov-reaction using lithium or sodium alkyl chlorophosphites. ... -
A new method for purification of carbonic anhydrase isozymes by affinity chromatography
(Maik Nauka/Interperiodica/Springer, 2004)A new affinity gel for purification of carbonic anhydrase isozymes was prepared using EUPERGIT(R) C-250L derivatized with p-aminobenzenesulfonamide, an inhibitor of carbonic anhydrase. The binding capacity of the affinity ... -
A new dispersive liquid-liquid microextraction method for preconcentration of copper from waters and cereal flours and determination by flame atomic absorption spectrometry
(Springer International Publishing Ag, 2014)A simple, rapid, sensitive, and inexpensive dispersive liquid-liquid microextraction method was developed for the determination of trace amounts of copper by flame atomic absorption spectrometry (FAAS). N,N'-bis-(2-hydro ... -
Determination of Rare Earth Elements by Solid Phase Extraction Using Chemically Modified Amberlite XAD-4 Resin and Inductively Coupled Plasma-Optical Emission Spectrometry
(Sprınger, 2014)A new solid phase extraction method was developed for the preconcentration and determination of the rare earth elements (REEs) Pr, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb, and Lu at trace levels using a mini-column packed with ... -
Solid-state synthesis of Pb2Sr2CaCU3-ySx and conducting properties
(Trans Tech Publications Ltd, 2004)In this study complete substitution of O by S in Pb-Sr-Ca-Cu-O superconducting system that has the general formula Pb2Sr2MCu3O8+delta (M = Y, Ca) had been attempted. For this purpose, solid-gas reactions of solid mixture, ... -
Differential in vitro effects of some pesticides on carbonic anhydrase activities from some freshwater and seawater fish erythrocytes
(Parlar Scientific Publications (P S P), 2004)The purpose of this study was to investigate the in vitro effects of 4 commonly used pesticides: the fungicides Nuarimol(TM) [alpha-(2-chlorophenyl)-alpha-(4-fluorophenyl)-5-pyridinemethanol] and Fenarimol(TM) [alpha-(2- ... -
Some physicochemical properties of perlite as an adsorbent
(Parlar Scientific Publications (P S P), 2004)Perlite is a glassy volcanic rock, which will, upon rapid controlled heating, expand into a frothy material of bulk density. Considering the fact that the uses of perlite are based primarily upon its physical and chemical ... -
Removal of acid yellow 49 from aqueous solution by adsorption
(Parlar Scientific Publications (P S P), 2004)In this study, the removal of an acid dye, acid yellow 49, used in the textile industry with sepiolite was investigated as a function of ionic strength, pH and temperature. Adsorption process was attained to the equilibrium ... -
Preconcentration of heavy metal ions from wastewater by solvent extraction using N,N '-bis(2-hydroxy-5-bromo-benzyl)-1,2 diaminopropane prior to their determination by flame atomic absorption spectrometry
(Taylor & Francis Ltd,, 2004)Toxic heavy metals such as copper(II), lead(II), cadmium(II), manganese(II), zinc(II), cobalt(II), and nickel(II) in wastewater can be preconcentrated in the organic phase containing a new reagent, N,N'-bis(2-hydroxy-5-b ... -
Synthesis and crystal structure of two dimeric cadmium(II) complexes bonded with pseudohalides, 1.1 and 1.3 bonding
(Walter De Gruyter Gmbh, 2004)Two different complexes were obtained from (dmpp) and Cd(II) ions with the aid of pseudohalide ions in non-aqueous solvents. The dinuclear complex formed with thiocyanate ions shows, using XRD, to posses two 1.3 bond mu ... -
Synthesis, characterization and crystal structure of new transition metal compounds of thiocyanate
(Int Union Crystallography, 2005)Two similar hetero-trinuclear centrosymmetric Cu-Hg-Cu Schiff base complexes were prepared and characterized by elemental analysis, NMR, IR and UV-Vis spectroscopy. The crystal structures of the title compounds reveal ... -
Preconcentration and determination of trace elements with 2,6-diacetylpyridine functionalized Amberlite XAD-4 by flow injection and atomic spectroscopy
(Royal Soc Chemistry, 2005)An on-line flow injection method for the direct determination of trace elements in environmental samples is described. A mini-column packed with 2,6-diacetylpyridine functionalized Amberlite XAD-4 was used to preconcentrate ... -
Separation and removal of mercury(II) from water samples using (acetylacetone)-2-thiol-phenyleneimine immobilized on anion-exchange resin prior to determination by cold vapor inductively coupled plasma atomic emission spectroscopy
(Taylor & Francis Ltd, 2005)(Acetylacetone)-2-thiol-phenyleneimine (H2L) immobilized on an anion-exchange resin (Dowex) was used for separation and removal of mercury from natural water samples and for preconcentration prior to its determination by ... -
Zeta potentials of perlite modified with dimethyldichlorosilane, 3-aminopropyltriethoxysilane and dimethyloctadecylchlorosilane
(Parlar Scientific Publications (P S P), 2005)Expanded perlite (EP) samples have been treated with dimethyldichlorosilane (DMDCS), 3-aminopropyl-triethoxy-silane (3-APT) and dimethyloctadecylchlorosilane (DMODCS). By studying the IR spectra of the samples, the perlite ... -
Dyeing of modified cotton fibres with disperse dyes from supercritical carbon dioxide
(Soc Dyers Colourists, 1998)Cotton, previously modified by reaction with benzoyl chloride and sodium benzoylthioglycollate, was dyed with disperse dyes APAN and DY82 in supercritical carbon dioxide at 100 degrees C and 300 bar. This process is compared ... -
Detergent less ultrasound-assisted extraction of trace elements from edible oils using lipase as an extractant
(Elsevier Science BV, 2015)A new method for the extraction and preconcentration of trace elements (Al, Ba, Cd, Cu, Fe, Mn, Mo, Ni, Ti, V and Zn) from edible oils by producing detergentless micro-emulsions via an ultrasound-assisted extraction using ... -
Surface titrations of perlite suspensions
(Academic Press Inc, 1998)The surface charge behaviour of unexpanded and expanded perlite samples in KNO3 and NaCl solutions were investigated as a function of pH and ionic strength. The solutions of KNO3 and NaCl ranging from 10(-3) to 1.0 M were ...
