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Núria Serrano José Manuel Díaz-Cruz Cristina Ariño Miquel Esteban 《Analytical and bioanalytical chemistry》2010,396(3):1365-1369
A commercially available screen-printed carbon electrode coated with an ex situ deposited bismuth film (BiSPCE) has been applied
to the determination of Pb(II) and Zn(II) ions in tap water (Barcelona water distribution network) by means of stripping voltammetry
(SV) and stripping chronopotentiometry (SCP). A good reproducibility of the measurements and a satisfactory agreement between
SV and SCP data were observed for both heavy metal ions. Although, in principle, the procedure could be also suited to the
determination of Cd(II), this species was not detected. The results were also consistent with the routine ICP-OES measurements
of the water distribution company, thus confirming the potential usefulness of such BiSPCE disposable devices for the analysis
of heavy metals in natural waters.
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Antiochia R Campanella L Ghezzi P Movassaghi K 《Analytical and bioanalytical chemistry》2007,388(4):947-956
The use of Vetiveria zizanioides (vetiver) was studied to evaluate its efficiency for the remediation of soils contaminated by heavy metals. Vetiver plants
were tested for Cr, Cu, Pb and Zn. Phytoextraction and bioremediation experiments were carried out by irrigating the vetiver
plants and the dry plants with solutions containing suitable amounts of Cr, Cu, Pd and Zn. The concentrations of the heavy
metals were determined in both experiments in shoot and root parts of vetiver plants using inductively coupled plasma atomic
emission spectroscopy after a mineralization step. Phytoextraction experiments showed a poor efficiency of vetiver for Cr
and Cu uptake (both less than 0.1% in shoots and roots after 30 days), but a quite high capability of Pb and Zn uptake (0.4%
in shoots and 1% in roots for Pb and 1% both in shoots and in roots for Zn, after 30 days). For these reasons the vetiver
plant can be considered a quite good “hyperaccumulator” only for Pb and Zn. As for bioremediation experiments, the vetiver
plant showed heavy metal uptake values significantly lower than those obtained with other biological substrates.
Figure Vetiver plant 相似文献
6.
A method for the determination of sixteen elements (Al, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Mo, Ni, Pb, Se, Sn, V, Zn) in seafood
by dynamic reaction cell inductively coupled plasma mass spectrometry (ICP–DRC–MS) is presented. A preliminary study of polyatomic
interferences was carried out in relation to the chemical composition of marine organisms belonging to different taxa. Acid
effects and other matrix effects in marine organisms submitted to closed-vessel microwave digestion were investigated as well.
Ammonia was the reactive gas used in the DRC to remove polyatomic ions interfering with 27Al, 52Cr, 56Fe and 51V. Optimal conditions for the simultaneous determination of analytes were identified in order to develop a fast multielement
method. A suite of real samples (mussels and various fish species) were used during method development along with three certified
reference materials: BCR CRM 278R (mussel tissue), BCR CRM 422 (cod muscle) and DORM-2 (dogfish muscle). The proposed analytical
approach can be used in conjunction with suitable chemometric procedures to address quality and safety issues in aquaculture
and fisheries. As an example, a case study is described in which mussels from three farming sites in the Venice Lagoon were
distinguished by multivariate analysis of element fingerprints.
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7.
Divis P Docekalová H Brulík L Pavlis M Hekera P 《Analytical and bioanalytical chemistry》2007,387(6):2239-2244
Concentrations of Cd, Cu, Cr, Pb, Ni and Zn were monitored in the Svitava River (the Czech Republic) during April and September
2005. Total concentrations and total dissolved concentrations were obtained through regular water sampling, and the diffusive
gradients in thin films technique (DGT) were used to gain information on the kinetically labile metal concentrations. Each
measured concentration was compared with the corresponding average (bio)available concentration calculated from the mass of
metal accumulated by the moss species Fontinalis antipyretica. The concentrations of Cd, Pb, Cr and Zn measured using DGT corresponded well with those obtained after the deployment of
Fontinalis antipyretica moss bags in the Svitava River, but the concentrations of Cu and Ni did not. The calculated (bio)available Cu concentration
correlated well with the total dissolved concentration of Cu, whereas no correlation was found to exist between the concentrations
of Ni.
Scheme of the Svitava River monitoring station, including the DGT sampling units and Fontinalis antipyretica moss bags
Electronic supplementary material Supplementary material is available in the online version of this article at and is accessible for authorized users. 相似文献
8.
External μPIXE has been used for characterisation of small samples of varnish from historical violins, and pieces of varnished
wood from historical and modern stringed instruments. To obtain spatially resolved information about the distribution of elements
across the varnish layers single-spot analysis, line-scans, and area-mapping were performed. Local resolution of approximately
20 μm was obtained from the 3 MeV, 1 nA proton micro-probe. Results from simultaneous multi-element determination of Na, Mg,
Al, Si, P, S, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Br, Rb, Sr, Ag, Cd, Sn, Ba, and Pb in historical varnishes are
presented. Semi-quantitative evaluation of line-scans recorded on diverse historical varnishes is reported. The applied method
is discussed in detail and the results obtained are critically reviewed and compared with those in the literature.
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9.
Dzhamilya N. Konshina Zaual A. Temerdashev Valeriy V. Konshin 《Journal of Sol-Gel Science and Technology》2018,86(1):34-41
Systematic studies of silica gels with covalently immobilized thiosemicarbazide and formazan groups under the conditions of competitive sorption from multicomponent systems were conducted. A methodological approach to determine the selectivity of the modified sorption material with regard to Cu(II), Ni(II), Co(II), Cd(II), and Zn(II) was proposed. Solid-phase extraction in equilibrium conditions of Cu(II), Zn(II), Co(II), Cd(II), and Ni(II) on a silica gel with covalently immobilized thiosemicarbazide and formazan groups in the conditions of competitive sorption was studied. The possibility to use the pseudo-second-order kinetic equation for assessment of mutual influence at competitive sorption has been shown. We found that sorption from multicomponent solutions proceeds as a non-additive process under the conditions of an excess of functional groups. 相似文献
10.
An X-ray fluorescence method (XRF) is presented that allowed low detection limits (at the 0.1–23 ng mL−1 level) to be obtained for Cr, Mn, Fe, Ni, Zn, Sr, Pb, Bi and Br in water. The samples were prepared using a thin layer method. Trace elements were determined via the calibration curve and standard addition. Absorption effects and inhomogenities in prepared samples were checked for using the emission–transmission method and internal standards, respectively. The results from the XRF method were compared with the results from the inductively coupled plasma atomic emission spectrometry method.
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11.
Astel A Tsakovski S Simeonov V Reisenhofer E Piselli S Barbieri P 《Analytical and bioanalytical chemistry》2008,390(5):1283-1292
The present study deals with the application of self-organizing maps (SOM) and multiway principal-components analysis to classify,
model, and interpret a large monitoring data set for surface water quality. The chemometric methods applied made it possible
to reveal specific quality patterns of the chemical and biological parameters used to monitor the water quality (relation
between water temperature, turbidity, hardness, colibacteria), seasonal impacts during the long period of observation and
the relative independence on the spatial location of the sampling sites (water supply sources for the City of Trieste).
Figure The schematic procedure for surface water pollution estimation supported by neural network-based classification and multivariate factor
analysis 相似文献
12.
Webb A 《Analytical and bioanalytical chemistry》2007,388(3):525-528
Figure Schematic diagram of a typical arrangement used for hyphenating chemical microseparations (e.g. capillary HPLC, CE, or CEC)
with microcoil NMR detection 相似文献
13.
K. M. Ibrahim I. M. Gabr G. M. Abu El-Reash R. R. Zaky 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):625-632
Abstract Acetone [N-(3-hydroxy-2-naphthoyl)] hydrazone (H2AHNH) has been prepared and its structure confirmed by elemental analysis and 1H NMR spectroscopy. It has been used to produce diverse complexes with Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and U(VI)O2 ions. The complexes obtained have been investigated by thermal analysis, spectral studies (1H NMR, IR, UV–visible, ESR), and magnetic measurements. IR spectra suggest that H2AHNH acts as a bidentate ligand. The electronic spectra of the complexes and their magnetic moments provide information about
geometries. The ESR spectra give evidence for the proposed structure and the bonding for some Cu(II) complexes. Thermal decomposition
of the Ni(II) and Cu(II) complexes afforded metal oxides as final products. Kinetic data were obtained for each stage of thermal
degradation of some of the complexes using the Coats–Redfern method. The formation of complexes in solution was studied pH-metrically
and the order of their stability constants (log K) was found to be U(VI)O2 > Cu(II) > Zn(II) > Ni(II) > Cd(II) > Co(II). Antimicrobial and eukaryotic DNA studies were carried out.
Graphical abstract
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14.
András Gergely Péter Horváth György Szász Gábor Veress 《Analytical and bioanalytical chemistry》2009,394(8):2105-2109
A three-step gradient reversed-phase high-performance liquid chromatography (RP-HPLC) method was developed for the separation
of dehydroepiandrosterone (DHEA), its sulfate ester (DHEA-S), its three C7-oxidized metabolites (7αOH-DHEA, 7βOH-DHEA, 7-keto-DHEA),
and its biosynthetic congeners (androstenedione, testosterone, estradiol, pregnenolone). This new method allows the quantitative
characterization of DHEA metabolism and biosynthetic transformation under given physiological, pathological, or therapeutically
influenced circumstances. Tetrahydrofuran probably acts as a proton acceptor coadsorbent, while isopropanol behaves as a proton
donor during the separation of testosterone, estradiol, and the stereoisomers of 7-OH-DHEA.
Figure Optimized gradient RP-HPLC results in full separation of DHEA from its biosynthetic congeners and metabolites 相似文献
15.
Nahid Nishat Shahnawaz Ahmad Bhat Abdul Kareem Swati Dhyani Abdulrahman Mohammad Azar Ullah Mirza 《Journal of inclusion phenomena and macrocyclic chemistry》2018,92(3-4):395-409
Macro-cyclic ligands from adipic acid, ethylenediamine with diethyloxalate and diethylmalonate and their respective metal complexes of Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) with macro cyclic ligands (LO) and (LM) L [N,N′-bis(2-aminoethyl)hexanediamide] were synthesized successfully. These metal complexes were characterized by Fourier transform infrared, ultraviolet visible spectrometry, proton nuclear magnetic resonance spectroscopy, and mass Spectrometry, CHNS and thermogravimetric analysis. The elemental analysis confirms the structures for Mn(II), Co(II) and Ni(II) complexes similar to octahedral geometry, Cu(II) complexes as a square planar geometry and Zn(II) complexes in the tetrahedral geometry. The molar conductivities of all the metal complexes were taken in 10?3 M DMSO, and values of all the metal complexes showed their electrolytic nature which indicates the presence of chloride ions. Thermal analysis supports as the metal complexes are thermally stable. The result of antimicrobial activity against various microorganisms confirms that the metal complexes are potent bactericides and fungicides than the ligand. Metal complexes of LO with Cu(II) and Zn(II) were found to be highly active against S. typhimurium than the complexes of LM. 相似文献
Graphical abstract
16.
Lobo L Fernandez B Pereiro R Bordel N Sanz-Medel A 《Analytical and bioanalytical chemistry》2007,389(3):743-752
A study about the effect of nitrogen in the calibration curves of a series of analytical emission lines has been carried out
in this work. Fifteen reference materials with different matrices (Fe, Al, Zn, Cu and Ni) were used (three of these reference
materials contain nitrogen in their composition) and plots of intensity versus the product “sputtering rate times element
concentration” were constructed for emission lines of the analytes considered in this work (Al, Fe, Cu, Cr, C, Mo, Zn, Si,
Ti and Ni). Two different fits were performed in each plot, first considering only the points corresponding to samples without
nitrogen in their composition and secondly including all the points. The results show almost negligible differences in the
emission yields calculated. On the other hand, a mixture of Ar containing 0.5% N2 was employed to check if the nitrogen effect was present at higher concentrations than those expected in analysis when samples
with high nitrogen concentrations are used. Differences between the slopes of the calibration curves with the Ar/N2 and pure Ar discharges were obtained (up to 30%). A study of the molecular bands recorded in the spectra when nitrogen is
present in the discharge and determination of the resulting interferences on the analytes have been performed.
Figure Glow discharge powered with radiofrequency energy 相似文献
17.
SPME in environmental analysis 总被引:1,自引:0,他引:1
Recent advances in the use of solid-phase microextraction (SPME) in environmental analysis, including fiber coatings, derivatization
techniques, and in-tube SPME, are reviewed in this article. Several calibration methods for SPME, including traditional calibration
methods, the equilibrium extraction method, the exhaustive extraction method, and several diffusion-based calibration methods,
are presented. Recent developed SPME devices for on-site sampling and several applications of SPME in environmental analysis
are also introduced.
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18.
Covalent adduction of the model protein apomyoglobin by 4-hydroxy-2-nonenal, a reactive end-product of lipid peroxidation,
was characterized by nanoelectrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (FTICR). The
high mass resolving power and mass measurement accuracy of the instrument facilitated a detailed compositional analysis of
the complex reaction product without the need for deconvolution and transformation to clearly show the pattern of adduction
and component molecular weights. Our study has also demonstrated the value of electron capture dissociation over collision-induced
dissociation for the tandem mass spectrometric determination of site modification for the 4-hydroxy-2-nonenal adduct of oxidized
insulin B chain as an example.
Figure FTICR allowed characterization of 4-hydroxy-2-nonenal (HNE)-modified apomyoglobin (an expanded spectrum of the +15 charge
state is shown) 相似文献
19.
We report a simple method that combines dialysis, as a purification method, with the multielement capability of ICP to determine
the titanium-to-transferrin mole ratio at physiological pH, under buffer conditions. The method, by means of which titanium
and transferrin are determined simultaneously, enabled us to assess the binding capacities of different titanocene complexes.
Figure Titanocene dichloride 相似文献
20.
Bode P Bueno MI Bortoleto GG Hoffmann G van den Ingh TS Rothuizen J 《Analytical and bioanalytical chemistry》2008,390(6):1653-1658
The heritability of chronic hepatitis in the Labrador Retriever is studied with the aim of identifying the related gene mutation.
Identification of cases and controls is largely based on instrumental neutron activation analysis (INAA) Cu determination
in liver biopsies. The burden for these companion animals may be reduced if nail clippings and hair (fur) could serve as a
noninvasive indicator for the hepatic Cu concentrations. No correlation was found between hepatic Cu concentrations and Cu
concentrations in hair and nail samples. However, hair and nail samples were also analyzed by X-ray tube excitation, taking
advantage of the X-ray Compton, Rayleigh, and Raman scattering which reflects the organic components such as the type of melanin.
Principal component analysis provided first indications that some differentiation between healthy and sick dogs could indeed
be obtained from hair and nail analysis.
Figure Principal component analysis of scattered region of x-ray fluorescence spectra of Labrador dog nails, demonstrating the differentiation
towards dogs with high and low Cu liver levels (respectively positive and negative PC2 values) reflecting hepatitis, as well
as gender (PC1: negative values for female and positive values for males) 相似文献