共查询到20条相似文献,搜索用时 31 毫秒
1.
C. S. Sastri V. Iyengar S. Demirel-Gülen M. Heck P. Hoffmann H. M. Ortner G. Blondiaux Y. Tessier T. Sauvage H. Petri 《Journal of Radioanalytical and Nuclear Chemistry》2004,259(3):515-520
As part of the study on “Reference Asian Man” project, dried food from different Asian countries, in powdered form, was analyzed
applying different techniques. Boron was determined by measuring prompt alphas in 11B(p,α)8Be reaction with 800 keV protons. Coulomb excitation was used for F and Na determination based on 19F(p,p'γ)19F (γ -rays: 110 and 197 keV) and 23Na(p,p'γ)23Na (γ -ray: 440 keV) reactions with 2.3 MeV protons. The elements Sc, Co, Zn, Rb, Ag and Ce were determined by neutron activation
analysis. The elements Ca, Mn, Fe, Ni, Cu, Zn, Sr and Mo were determined by X-ray fluorescence technique.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
2.
T. Anovski T. Memedović M. Rastovac 《Journal of Radioanalytical and Nuclear Chemistry》1972,12(1):483-489
Instrumental activation analysis was used to determine the contents of certain elements in human serum albumin (HSA). Sample
irradiation was performed with a thermal neutron flux of 1.5·1013 n·cm−2·sec−1 in the RA nuclear reactor of the Boris Kidrič Institute, Vinča. Measurements were performed on a 4096-channel analyser with
a high-resolution Ge(Li) detector. The Na, Cu, Br, Au, Hg, Cr, Fe, Ag, Sc, Ba and Co contents were determined in HSA produced
by the Institute for Blood Transfusion, Belgrade. 相似文献
3.
Determination of major and trace elements in crude oils by neutron activation and reflection methods
J. Csikai S. M. Al-Jobori Cs. M. Buczkó S. Szegedi 《Journal of Radioanalytical and Nuclear Chemistry》1982,71(1-2):215-223
The concentrations of O, Na, Cl, V, Mn and Ni in crude oils of different origins were determined, using sampling (SNAA) and
on-stream (ONAA) activation analyses. Samples were irradiated with thermal and fast neutrons produced by a 0.3 mg252Cf source and a 14 MeV generator. The H-content and the C/H atomic ratio have been determined by thermal neutron reflection
method using an 18 GBq Pu−Be source.
This work was supported in part by the Hungarian Academy of Sciences. 相似文献
4.
Mineral element content in prized matsutake mushroom (Tricholoma matsutake) collected in China 总被引:1,自引:0,他引:1
Tao Li Ji Zhang Tao Shen Yun-Dong Shi Shao-Bing Yang Ting Zhang Jie-Qing Li Yuan-Zhong Wang Hong-Gao Liu 《Chemical Papers》2013,67(6):672-676
The contents of Ca, Cu, Fe, K, Mg, Mn, Na, and Zn in fruiting bodies of the highly-prized matsutake mushroom (Tricholoma matsutake) from twelve widely separated sites in Southwest China were determined using AAS. The results for dried mushrooms showed that the mean contents (mg kg?1) of the determined elements decreased in the following order: K (440–2000), Na (150–740), Ca (90–850), Mg (90–680), Zn (20–180), Fe (13–78), Cu (0.34–45), Mn (0.09–7.6). 相似文献
5.
L. G. Nagy G. Török G. Fóti T. Tóth L. Feuer 《Journal of Radioanalytical and Nuclear Chemistry》1973,16(1):245-255
For the selective removal of the matrix activity (24Na,32P and42K) in the neutron activation analysis of biomedical samples the inorganic separators “hydrated antimony pentoxide”, zirconium
phosphate, and titanium phosphate were prepared. The sorption parameters of the samples were determined via elution chromatography
techniques, with appropriate tracers. The basic principles of the sorption processes were investigated, and the experimental
conditions were optimized. These inorganic separators were then applied, combined with a distillation procedure and an ion-exchange
separation, for the determination of the following trace elements in animal blood samples: Mn, Co, Cu, Fe and Zn. 相似文献
6.
B. Wierczinski J. Alstad K. Eberhardt J. V. Kratz R. Malmbeck M. Mendel A. Nähler J. P. Omtvedt G. Skarnemark N. Trautmann N. Wiehl 《Journal of Radioanalytical and Nuclear Chemistry》1998,238(1-2):193-197
The nucleus23Na has been investigated by studying the primary γ-rays emitted from 53 keV neutron capture in it using a high resolution
and high efficiency (100%) HPGe detector and NaI(T1) detector for anti-Compton. 24 primary γ-rays were placed in the24Na, in which 3 primary γ-rays were new ones from a (n, γ) reaction, and reported for the first time. In order to obtain an
exact energy calibration within 7 MeV,56Fe(n,γ)57Fe reaction was used at thermal neutron energy. Intensity calibration was obtained from the27Al(p,γ)28Si reaction atE
p=2046 keV. The neutron binding energy of24Na was determined to be 6959.75 keV. 相似文献
7.
Martin A. Amberger Peter Barth Otto F?rster Jos�� A. C. Broekaert 《Mikrochimica acta》2011,172(3-4):261-267
The use of direct current arc atomic emission spectrometry (DC-arc-AES) with a CCD spectrometer for the direct determination of the trace impurities Al, Ca, Cr, Cu, Fe, Mg, Mn, Na, Ni, Si, Ti, and Zr in three well characterized boron carbide powders is described. The detection limits obtained by the procedure were found to be between 0.2 (Mg) and 25 (Na) ??g?g?1 for the above elements. Three boron carbide powder samples with trace element concentrations between 0.9 (Cu) and 934 (Si) ??g?g?1 for Al, Ca, Cr, Cu, Fe, Mg, Mn, Na, Ni, Si, Ti, and Zr ?? including the standard reference material ERM?-ED102 ?? were analyzed by DC-arc-AES. The relative standard deviations for 9 measurements when using 5.0?±?0.3?mg of the respective samples were found to vary from 6.2 to 27% for Al and Cu, respectively. The trace elements Al, Ca, Cr, Cu, Fe, Mn, Ni, Si, Ti and Zr could be determined in the standard reference material and their concentrations determined by DC-arc AES were found to be between 89 and 116% of the accepted values. Fe and Ti were determined by DC-arc AES in the three boron carbide samples as well as in Al2O3, BN, SiC, coal fly ash, graphite and obsidian rock. The correlation coefficients of the plots of the net intensities versus the accepted values over the concentration ranges from 18 to 1750 and from 6 to 8000???g?g?1 are 0.999 and 0.990 for Fe and Ti, respectively. Figure
Coupling of DC arc to a CCD spectrometer 相似文献
8.
A preliminary study to evaluate the use of neutron activation analysis for the characterization of six groups of man-made
fibers for forensic purposes has been made. A total of 81 samples of acetate, acrylic, modacrylic, nylon, polyester and rayon
were analyzed. Small samples, approximately the size typically found during a crime scene search, were analyzed using a Ge(Li)
detector system following a 20 min irradiation at a flux of 5·1013 n·cm−2·sec−1. The following elements were determined quantitatively in one or more of the samples: Ti, Sr, Au, Zn, Sb, Br. Mn, Mg, Cu,
In, Co, Cu, V, K, Al, Cl, Na, Ca, and S. Significant qualitative and quantitative differences were found both between and
within the six groups. However, within certain groups some fibers from different manufacturers showed marked similarities
in qualitative and quantitative composition. 相似文献
9.
A method has been developed for determining silicon in aluminium by fast neutron activation. It is based on the separation
of two gamma lines by a Ge(Li) detector: the 1.73 MeV line from the product of27Al(n, α)24Na and the 1.78 MeV line from the28Si(n, p)28Al reaction. In the case of aluminium-silicon alloys 100 μg silicon can be determined, with an error of 10% in an aluminium
sample of 1 g.
This work was supported in part by the International Atomic Energy Agency. 相似文献
10.
Jibrin Sabo Suleiman Bin Hu Xuli Pu Chaozhang Huang Zucheng Jiang 《Mikrochimica acta》2007,159(3-4):379-385
A new method is proposed using a microcolumn (20 mm × 2.0 mm) packed with nanometer-sized zirconia as solid-phase extractor
for the separation/preconcentration of Mn, Cu, Cr, Zn, Ni and Co prior to their determination by inductively coupled plasma
optical emission spectrometer (ICP-OES) in environmental samples. The factors affecting the separation and preconcentration
of analytes such as pH, sample flow rate and volume, eluent concentration and volume were determined, interfering ions were
studied, and the optimal experimental conditions were established. The adsorption capacity of nanometer-sized ZrO2 for Mn, Cu, Cr, Zn, Ni and Co was found to be 1.3, 1.3, 1.7, 2.0, 3.9 and 1.5 mg g−1, respectively. The detection limits of the method were 12, 58, 24, 2, 7 and 36 ng L−1, respectively, with a preconcentration factor of 25. The precision of this method was 1.7% (Mn), 2.9% (Cu), 5.9% (Mn), 3.8%
(Mn), 6.2% (Mn) and 4.3% (Mn) with 9 determinations of 10 ng mL−1 of target analytes, respectively. The method was successfully applied to the determination of trace metals in lake water,
dried fish samples, certified reference materials of human hair and milk, and provided satisfactory results. 相似文献
11.
V. Krivan 《Journal of Radioanalytical and Nuclear Chemistry》1975,26(1):151-163
Proton activation analysis has been applied to develop a procedure for the simultaneous determination of chromium, nickel
and copper. The procedure involves the bombardment of the sample with protons to induce52Cr(p, n)52mMn,60Ni(p, n)60Cu and63Cu(p, n)63Zn reactions. These reactions have been studied for proton energies from 11 MeV to 15 MeV. Thick target yields for the production
of the indicator radionuclides as well as the sensitivities of the determination have been measured in this energy region
and are compared with results obtained for other charged particle induced reactions. Detailed data are given on nuclear and
instrumental interferences. The trace elements have been determined nondestructively and simultaneously in cobalt with a relative
precision of 8 to 15%. 相似文献
12.
Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) 3-methylglutarates were prepared as solids with general formula MC6 H8 O4 ×n H2 O, where n =0–8. Their solubilities in water at 293 K were determined (7.0×10−2 −4.2×10−3 mol dm−3 ). The IR spectra were recorded and thermal decomposition in air was investigated. The IR spectra suggest that the carboxylate
groups are mono- or bidentate. During heating the hydrated complexes lose some water molecules in one (Mn, Co, Ni, Cu) or
two steps (Cd) and then mono- (Cu) or dihydrates (Mn, Co, Ni) decompose to oxides directly (Mn, Cu, Co) or with intermediate
formation of free metals (Co, Ni). Anhydrous Zn(II) complex decomposes directly to the oxide ZnO.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
13.
L. -O. Plantin 《Journal of Radioanalytical and Nuclear Chemistry》1972,12(1):441-449
A method has been worked out for the determination of Mn, Cu, Zn, K and Na in tissue biopsies weighing between 10 and 50 mg.
The samples were dried, packed in polyethylene containers and irradiated at a flux of 1.8·1012 n·cm−2·sec−1 for 48 hrs. They were dissolved and separated into five fractions by ion exchange chromatography. Managenese was precipitated
and counted as MnO2 and zinc as quinaldate. Copper and potassium were counted in solution. Sodium was taken up in hydrated antimony pentoxide
(HAP) and counted in that stage. Accuracy, precision and specificity were determined by recovery experiments and by analysis
ofBowen's biological standard. 相似文献
14.
Z. Lamari S. Landsberger J. Braisted H. Neggache R. Larbi 《Journal of Radioanalytical and Nuclear Chemistry》2008,276(1):95-99
Neutron activation analysis (INAA) has been applied to multielemental determination of eleven medicinal plants used to cure
the urinary tract diseases observed in Algeria. These plants include Androgena Citratus, Ceratonia Siliquata, Punica Granatum, Glyryrrhiza Glabra, Lausaunia Alba, Fragaria Vesca, Arbutus Unedol,
Hordeum Vulgaris, Papieteria Officinalis, Zea Mays L, and Davallia Seae. Concentrations of twenty elements Ba, Br, Ca, Cl, Co, Cu, Cr, Fe, I, Mn, Na, Mg, Rb, Sb, Se, Sc, Sr, Ti, V, and Zn have
been determined by short, and long irradiation times with a thermal and epithermal flux of 1.4·1012 n·cm−2·s−1 and 1.4·1011 n·cm−2·s−1, respectively. These analyses were performed in conjunction with Compton suppression. In almost herbs studied the Co, Cr,
Cu, Rb, Sb, Sc, Se and V are found to be present at trace levels, Br, Mn, and Zn at the minor level, and Ca, Cl, Fe, Mg and
Na are generally at the major level. The accuracy of the measurements has been evaluated by analyzing NIST-botanical references
materials. 相似文献
15.
S. Shibata Y. Takashima R. Gensho M. Honda 《Journal of Radioanalytical and Nuclear Chemistry》1977,36(1):11-18
The nuclide53Mn was produced by the following three nuclear reactions,52Cr(d, n)53Mn,51V(3He n)53Mn and50Cr(α, n), (α, p)53Mn. Enriched52Cr and50Cr metal targets were prepared on copper plate holder by electrodeposition. The commercially available natural vanadium foil
was used for the51V(3He, n)53Mn reaction. Each target was bombarded in a cyclotron. Manganese was extracted and purified without using carrier from the
bombarded targets by anion and cation exchanges and solvent extraction. The isotopic ratio53Mn/55Mn was measured by mass spectrometry and the amount of55Mn was determined by neutron activation analysis. The activity of53Mn obtained was 7 dpm by 750 millicoulombs in3He bombardment (E3He=20 MeV). The activity due to by-product54Mn was about several thousands times higher than that of53Mn in3He and deuteron bombardments, which were produced through51V(3He, γ)54Mn and53Cr(d, n)54Mn. In alpha bombardment (Eα=15 MeV), the activity of53Mn produced was 8 dpm by 95 millicoulombs. The activity ratio, dpm54Mn/dpm53Mn, was about 3, and this ratio was the best one among the results so far obtained. 相似文献
16.
Wiesława Ferenc Beata Bocian J. Sarzyński 《Journal of Thermal Analysis and Calorimetry》2006,84(2):377-383
Four new complexes of 2,3,4-trimethoxybenzoic acid
anion with manganese(II), cobalt(II), nickel(II) and copper(II) cations were
synthesized, analysed and characterized by standard chemical and physical
methods. 2,3,4-Trimethoxybenzoates of Mn(II), Co(II), Ni(II) and Cu(II) are
polycrystalline compounds with colours typical for M(II) ions. The carboxylate
group in the anhydrous complexes of Mn(II), Co(II) and Ni(II) is monodentate
and in that of Cu(II) monohydrate is bidentate bridging one. The anhydrous
complexes of Mn(II), Co(II) and Ni(II) heated in air to 1273 K are stable
up to 505–517 K. Next in the range of 505–1205 K they decompose
to the following oxides: Mn3O4,
CoO, NiO. The complex of Cu(II) is stable up to 390 K, and next in the range
of 390–443 K it loses one molecule of water. The final product of its
decomposition is CuO. The solubility in water at 293 K is of the order of
10–3 mol dm–3
for the Mn(II) complex and 10–4 mol dm–3
for Co(II), Ni(II) and Cu(II) complexes. The magnetic moment values of Mn2+,
Co2+, Ni2+ and Cu2+
ions in 2,3,4-trimethoxybenzoates experimentally determined in the range of
77–300 K change from 5.64–6.57 μB (for Mn2+),
4.73–5.17 μB (for Co2+), 3.26–3.35 μB
(for Ni2+) and 0.27–1.42 μB (for Cu2+).
2,3,4-Trimethoxybenzoates of Mn(II), Co(II) and Ni(II) follow the Curie–Weiss
law, whereas that of Cu(II) forms a dimer. 相似文献
17.
S. M. Qaim R. Wölfle G. Stöcklin 《Journal of Radioanalytical and Nuclear Chemistry》1974,21(2):395-405
Radiochemical separation methods for K, Mn, Cu, Ga, Sr, Y, Nb, Ag, I, Ce, Eu, Lu and Pt, employing precipitation, adsorption,
distillation, solvent extraction or ion-exchange, as used in the investigations of rare nuclear reactions such as (n, t) and
(n,3He) at 14. 6 MeV, are described. For studying the (n, t) reaction at 23 MeV a method for the vacuum extraction and “low-level”
gas-phase counting of tritium is outlined. The measured nuclear reaction cross-section data are discussed briefly. 相似文献
18.
An effective, rapid and simple analytical method for the determination of Na, K, Ca, Mg, Cd, Pb, Ba, Fe, Mn, Sr, Zr, Cu, Zn
and Al at mg kg−1 levels in the ultrapure salts MgCl2 and CaCl2 using optical emission spectrometry was developed. Optimisation of the operation conditions was performed with real samples
of ultrapure MgCl2 and CaCl2. The results of the determination with multi-elemental water standards were compared to the internal standardisation, the
standard addition method, and the maximum allowable content of the above mentioned elements in pure chemicals. The method
was shown to be very sensitive with the following limits of detection: Na 1.01, K 3.12, Ca 0.263, Mg 0.275, Cd 0.0832, Pb
0.482, Ba 0.0153, Fe 0.0528, Mn 0.0473, Sr 0.0203, Zr 0.638, Cu 0.0732, Zn 0.0686 and Al 0.459 (all in mg kg−1). The method exhibited satisfactory precision, high analytical recoveries, linear responses of an accuracy of at least 4
orders of magnitude and low contamination susceptibility. 相似文献
19.
Spectral,
magnetic and thermal investigations of some d-electron
element 3-methoxy-4-methylbenzoates
Conditions
for the preparation of Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) 3-methoxy-4-methylbenzoates
were investigated and their quantitative composition and magnetic moments
were determined. The IR spectra and powder diffraction patterns of the complexes
prepared of general formula M(C9H9O3)2·nH2O (n=2
for Mn, Co n=1 for Ni, Cu, n=0
for Zn, Cd) were prepared and their thermal decomposition in air was studied.
Their solubility in water at 293 K is of the order 10–2
(Mn)–10–4 (Cu) mol dm–3.
IR spectra of the prepared 3-methoxy-4-methylbenzoates suggest that carboxylate
groups are bidentate bridging. The magnetic moments for the paramagnetic complexes
of Mn(II), Co(II), Ni(II) and Cu(II) attain values 5.50, 4.45, 3.16 and 1.79
B. M., respectively. During heating the hydrated complexes lose crystallization
water molecules in one step and then the anhydrous complexes decompose directly
to oxides MO and Mn3O4. Only Co(II) complex decomposes to Co3O4
with intermediate formation CoO. 相似文献
20.
R. Vlastou C. T. Papadopoulos M. Kokkoris G. Perdikakis S. Galanopoulos M. Serris A. Lagoyannis S. Harissopulos 《Journal of Radioanalytical and Nuclear Chemistry》2007,272(2):219-222
The neutron facility at the 5.5 MV tandem T11/25 Accelerator of NCSR “Demokritos” can deliver monoenergetic neutron beams
in the energy range from thermal to 450 keV, 4–11.5 MeV and 16–20.5 MeV via the 7Li(p,n), 2H(d,n) and 3H(d,n) reactions, respectively. The flux variation of the neutron beam is monitored by using a BF3 counter and a liquid scintillator BC501A detector. The 232Th(n,2n)231Th and 241Am(n,2n)240Am as well as (n,2n), (n,p) and (n,α) reactions on natural Ge and Hf isotopes, have been investigated from threshold up to
11.5 MeV, by using the activation method. The cross section values have been determined relative to the 197Au(n,2n)196Au, 27Al(n,α)24Na and 93Nb(n,2n) reference reaction cross sections. 相似文献