共查询到20条相似文献,搜索用时 15 毫秒
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A simple and new simultaneous spectrophotometric method is proposed for the analysis of a three-component system containing
Cu(II), V(V) and Fe(III) without separation using 2-hydroxy-1-naphthaldehyde benzoylhydrazone (OHNABH). The reagent reacts
with all the three metal ions at pH 5, forming soluble colored species in 30% DMF. The physico-chemical characteristics, statistical
analysis and application of the method for the analysis of complex materials are reported. The effect of diverse ions and
the stoichiometry and stability constants are also studied.
This article was submitted by the authors in English. 相似文献
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Koichi Oguma Shoji Kozuka Kazuyuki Kitada Rokuro Kuroda 《Fresenius' Journal of Analytical Chemistry》1991,341(9):545-549
Summary Two flow injection analysis systems have been worked out for the simultaneous determination of Fe(III), Fe(II), and Ti(IV) based on the kinetic spectrophotometry with Tiron. The first system uses a silver reductor column and a single detector with two flow cells aligned in the same optical path to yield two peaks corresponding to (a) Ti(IV)-Tiron and (b) Ti(IV) plus total iron(III)-Tiron complexes. An another sample injection without the silver column yields a single peak which corresponds to Ti(IV) plus Fe(III)-Tiron complexes. With the two sample aliquot injections the system permits simultaneous determinations with throughput of 30 samples/h in the g to several tens g range of each species. The second system is a multidetection system with or without the silver reductor column using the same spectrophotometry with Tiron, in which the entrapment of the sample plug into a closed system allows its repetitive passage through a single detector. With the advantage of much simpler instrumentation, the system permits 6 samples/h to be analyzed for the three metal species with somewhat lower precisions than the first system. 相似文献
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《Journal of Coordination Chemistry》2012,65(14):1179-1190
Mononuclear and homobinuclear o-cresolphthalein complexone complexes with VO2+, Cr3+, MoO+, and UO2 2+ have been prepared and their structures investigated. The empirical formulas, the mode of bonding, and the geometry of the complexes were obtained from elemental and thermal analyses, IR, electronic and ESR spectra, magnetic moment determinations, DC and CV polarographic studies. 相似文献
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Summary 2-Pyridylphenylacetonitrile (ppa) is oxidized by iron(III) chloride in dry ethanol to 1,2-dicyano-1,2-di(phenyl)-1,2-(2-pyridyl)ethane (dcppe). When 1,2-dichloroethane or ether are used as solvents, a 31 complex of dcppe with iron trichloride, [(FeCl3)3(dcppe)] is obtained.Titanium(IV), vanadium(IV) and chromium(III) chlorides react with ppa and dcppe, giving complexes of general formulae [MCl4(ppa)] (M = Ti or V), [CrCl3(ppa)n] (n = 2 or 3), [(MCl4)2(dcppe)] (M = Ti or V) and [CrCl3(dcppe)]. 相似文献
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Giancarla Alberti Federico Quattrini Roberta Colleoni Valeria M. Nurchi Raffaela Biesuz 《Chemical Papers》2015,69(8):1024-1032
The development of a sensor based on the functionalization of common filter paper with deferoxamine (DFO) is proposed with the prospect to produce a solid phase for iron(III) and vanadium(V) sensing. The main features of this sensor are the simplicity of operation, good sensitivity and feasible applicability to real samples without the need of pre-treatment procedures. DFO was selected not only for it is easily anchored to the solid support, but also because it forms colored complexes with iron(III) and vanadium(V); hence, the developing of a simple colorimetric sensor can be considered. In particular, an innovative and economic way to perform colorimetric measurements using a desktop scanner is described. A complete characterization of the functionalized material is also reported. 相似文献
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Summary Complexes of formula [MCl3(glyH)3] (M=Ti, V and Fe) [CrCl3(glyH)2H2O], [MCl2(glyH)2(H2O)2] (M=Co and Cu) and [NiCl2(glyH)3H2O] have been prepared and characterized by potentiometric curves, chemical analysis, magnetic properties, i.r. and electronic spectral data. 相似文献
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A new simple, very sensitive, selective and accurate procedure for the determination of trace amounts of iron(II) by solid-phase spectrophotometry (SPS) has been developed. The procedure is based on fixation of iron(II) as 2,3-dichloro-6-(3-carboxy-2-hydroxy-1-naphthylazo)quinoxaline on a styrene-divinylbenzene anion-exchange resin. The absorbance of resin sorbed iron(II) complex is measured directly at 743 and 830nm. Iron(III) was determined by difference measurements after reduction of iron(III) to iron(II) with hydroxylamine hydrochloride. Calibration is linear over the range 1.0-20 microgL(-1) of Fe(II) with relative standard deviation (R.S.D.) of 1.65% (n=10.0). The detection and quantification limits for 100mL sample system are 280 and 950 ngL(-1) using 0.5 g of the exchanger. The molar absorptivity and Sandell sensitivity are also calculated and found to be 2.86 x 10(6)Lmol(-1)cm(-1) and 0.0196 ngcm(-2), respectively. The proposed procedure has been successfully applied to determine iron(II) and iron(III) in tap, mineral and well water samples. 相似文献
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《Annales de Chimie Science des Materiaux》1998,23(1-2):107-111
A vanadium(III) tris(metaphosphate) compound has been synthesized and characterized. The compound crystallises in the monoclinic space group Ic with lattice parameters a= 10.615(2), b= 19.095(4), c= 9.432(1) Å, β= 97.94(1) °. IR and UV-V studies confirm a chain structure for this compound. The ESR powder spectrum shows a weak signal belonging to the V3+ ions. The D parameter value has been estimated between 2 and 8 cm−1. 相似文献
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Leo E. Manzer 《Journal of organometallic chemistry》1976,110(3):291-294
An improved synthesis of chlorodicyclopentadienyl derivatives of scandium(III), titanium(III) and vanadium(III) has been developed by the reaction of thallium cyclopentadienide with the appropriate anhydrous metal trihalides. 相似文献
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Vanadium(V) and iron(III) can be determined simultaneously at pH 2 and 25 degrees C by a single experiment using their kinetic effect on the oxidation of indigo carmine by bromate which goes through an induction period and then decreases in absorbance, at lambda(max), 612 nm. The rate of the color-fading of indigo carmine is proportional to the concentration of vanadium and is independent of the concentration of iron. The length of the induction period of the reaction is related to the concentration of iron and is independent of the concentration of vanadium. Concentrations of 0.3-2 (mug ml(-1)) vanadium(V) and 6-12 (mug ml(-1)) iron(III) were determined with mean relative errors of 2.7 and 1.6%, respectively. The interference effects of various cations and anions on determination of mixtures of vanadium and iron is reported. Application of the method to real samples and several mixtures of standard solutions are performed which gave acceptable results. 相似文献
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Pilar Souza José A. García-Vázquez José R. Masaguer Agueda Arquero 《Transition Metal Chemistry》1986,11(6):229-232
Summary New titanium(IV), vanadium(IV) and tin(IV) complexes with Schiff bases derived from 2-(2-aminophenyl)benzimidazole with benzaldehyde (L1) and salicylaldehyde (L2) have been prepared and have the general formulae MX4 · 2L (M = Ti, V or Sn; L = L1 or L2; X = Cl or Br).All the complexes have been characterized by elemental analyses, magnetic measurements, e.p.r., electronic and i.r. spectral studies. The results show that the Schiff bases act as monodentate ligands. Tentative structures for the complexes are suggested. 相似文献
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Summary 1-(o-Carboxyphenyl)-3-hydroxy-3-phenyltriazene was found to be an excellent spectrophotometric reagent for the determination of nickel(II), palladium(II) and copper(II). At pH 6.8–8.3, 2.4–3.5 and 2.2–3.8, nickel, palladium and copper form greenish yellow, yellowish orange and light green complexes with maximum absorption at 410, 410, 400 nm, respectively. The systems obey Beer's law with optimum ranges from 0.25 to 2.0 ppm for Ni(II), 0.5–4.0 for Pd(II) and 0.5–4.0 for Cu(II); the elements form 11 complexes with the instability constants 2.1×10–5, 1.5×10–5 and 2.0×10–5, resepctively. Effects of other anions and cations on the colour systems have been studied and procedures for the determination of Ni(II), Pd(II) and Cu(II) in presence of each other are described.
Spektrophotometrische Bestimmung von Nickel(II), Palladium(II) und Kupfer(II) nebeneinander und in Gegenwart anderer Ionen mit Hilfe von 1-(o-Carboxyphenyl)-3-hydroxy-3-phenyltriazen
Zusammenfassung Ni, Pd und Cu bilden mit dem Reagens bei pH 6,8–8,3, 2,4–3,5 bzw. 2,2–3,8 grünlich-gelbe, gelblich-orange bzw. hellgrüne Komplexe mit Absorptionsmaxima bei 410, 410 bzw. 400 nm. Das Beersche Gesetz wird in den Bereichen 0,25–2,0, 0,5–4,0 bzw. 0,5–4,0 ppm befolgt. Die Elemente bilden 11-Komplexe mit den Instabilitätskonstanten 2,1 · 10–5, 1,5 · 10–5 bzw. 2,0 · 10–5. Der Einfluß anderer Kationen und Anionen wurde untersucht und Arbeitsvorschriften werden angegeben.相似文献
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Ala''ddin M. Almuaibed Alan Townshend 《Fresenius' Journal of Analytical Chemistry》1989,335(8):905-909
Summary Methods for the individual and sequential flow injection spectrophotometric determination of vanadium(V) and titanium(IV) are proposed, based on the formation of peroxo complexes. The detection limits are 1.0 × 10–5 mol/l V (120 l) and 2.5 × 10–6 mol/l Ti (80 l). A cation exchange resin mini-column is incorporated on-line into the vanadium manifold to remove the titanium complex and allow the vanadium to be determined selectively. A normal injection valve is used for the individual determinations, but it is modified for determination of V(V)/–Ti(IV) mixtures in order to introduce two samples sequentially into the reagent stream. One passes through a cation exchanger minicolumn, the other through an empty column, before reaching the detector. The former allows V alone to be measured, the latter V+Ti.
Dedicated to Prof. Dr. G. Tölg on the occasion of his 60th birthday 相似文献
Individuelle und sequentielle spektralphotometrische Fließinjektionsbestimmung von Vanadium(V) und Titan(IV)
Dedicated to Prof. Dr. G. Tölg on the occasion of his 60th birthday 相似文献
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J. M. Bosque-Sendra Ma_ Carmen Valencia Said Boudra 《Analytical and bioanalytical chemistry》1998,360(1):31-37
The separation and preconcentration of vanadium (IV) and vanadium (V) using Sephadex DEAE A-25 with Eriochrome Cyanine R has been studied, based on the preconcentration of vanadium (IV) in the first step and V(V) after reduction with ascorbic acid in the second step. Factors affecting the optimum fixation of the complex were investigated. The absorbance of the solid phase is measured directly at 563 nm for V(IV), at 585 nm for V(V) and at 750 nm for both. The proposed method provides a simple and specific procedure for the separation of vanadium in natural waters. The calibration graph is linear up to 150 ng/mL, with RSD of 4.7% for V(IV) and 4.0% for V(V). The detection limits are 1.6 and 1.4 ng/mL for V(IV) and V(V), respectively. 相似文献
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D. A. Razborov A. N. Lukoyanov V. M. Makarov M. A. Samsonov I. L. Fedushkin 《Russian Chemical Bulletin》2015,64(10):2377-2385
Reactions of (2,6-diisopropylphenylimino)acenaphthenone (dpp-mian) with gallium(III), antimony(III), titanium(IV), and cobalt(II) chlorides in toluene lead to the formation of compounds of the formulas [(dpp-mian)2GaCl2][GaCl4], (dpp-mian)SbCl3, (dpp-mian)TiCl4, and [(dpp-mian)CoCl2]2[CoCl2(EtOH)4], respectively. The complexes were characterized by IR and NMR spectra, their structure was established by X-ray crystallography. 相似文献