共查询到20条相似文献,搜索用时 15 毫秒
1.
Lj. Jaćimović R. Drašković B. Ostojić 《Journal of Radioanalytical and Nuclear Chemistry》1977,37(1):415-419
The contents of Hg, Cr, La, Sc, Co, Fe and Sb in some human concretions have been determined by instrumental radioactivation
analysis. Urinary bladder and kidney concretions surgical removed from the patient have also been analyzed. 相似文献
2.
C A Helsby 《Analytica chimica acta》1974,69(2):259-265
Interferences in the atomic absorption of strontium by calcium and phosphate at the levels found in human tooth enamel were investigated for both air-acetylene and nitrous oxide-acetylene flames. In air-acetylene flames, the interferences can be reduced by the addition of lanthanum(III); but perchloric acid, used for sample dissolution, causes a significant reduction in the calcium-phosphate interference, so that a standard addition method can be applied, without the need for any chemical separations. An average recovery of 98.6% for added amounts of strontium to enamel showed the proposed method to be reliable. 相似文献
3.
The determination of strontium in human tooth enamel by flameless atomic-absorption spectrometry was found to be subject to interference from the calcium/phosphate matrix of the enamel. The standard addition method was used to compensate for this interference. Hydrochloric acid and nitric acid did not affect the strontium absorption, but perchloric acid caused a significant reduction in the absorption. The sensitivity of the flameless atomic-absorption enabled 1-mg samples of enamel to be analysed. Hence, the proposed method can be used to determine the distribution of strontium through the tooth. An average recovery of 100.4% for amounts of strontium added to enamel showed that the proposed method was reliable. 相似文献
4.
Busch S 《Angewandte Chemie (International ed. in English)》2004,43(11):1428-1431
5.
K. Kostic R. J. Draškovic M. Ratkovič D. Kostić R. S. Draškovic 《Journal of Radioanalytical and Nuclear Chemistry》1977,37(1):405-413
In our biological investigations some trace elements have been determined by instrumental radioactivation analysis in organs
of normal rats. The results of trace element distribution of Cr, Zn, Br, Sb, Fe, Co, Sc, Ag and Na in liver, spleen, brain,
lung, kidney and heart of normal rats are presented in the paper. 相似文献
6.
J. Kvíčala J. Havelka J. Zeman J. Němec 《Journal of Radioanalytical and Nuclear Chemistry》1991,149(2):267-274
Neutron activation analysis without radiochemical separation was used for simultaneous analysis of eight trace elements in thyroid glands, obtained as necroptic material from persons not suffering from diseases of this gland. Inorganic standard solutions were used for calculations of concentrations of measured elements. Concentrations are expressed in ppm, or ppb. IAEA reference materials were used for quality assurance of analyses. From analyses of 42 thyroids concentration levels of Se, Cs, Sc, Fe, Cr, Zn, Co, and Rb and their variances in the thyroids were calculated. These results might serve as comparison material for medical research of pathological and functional changes in thyroid glands. 相似文献
7.
J. Vučina V. Šćepanović R. Drašković 《Journal of Radioanalytical and Nuclear Chemistry》1978,44(2):371-378
Some trace elements in samples from the aluminium industry (Aluminium Kombinat, Titograd, Yugoslavia) were determined by instrumental
neutron activation analysis. Samples characteristic for alumina production (bauxite, red sludge), reduction cell components
(alumina, anode, AlF3, cryolite) and aluminium produced (purity 99.5–99.7%) have been analyzed. 10 trace elements were determined under a given
set of working conditions and followed through the routine production. 相似文献
8.
A. N. Shaikh R. N. Khandekar S. J. S. Anand U. C. Mishra 《Journal of Radioanalytical and Nuclear Chemistry》1992,163(2):349-353
Toxic trace metals like mercury, arsenic and cadmium have been determined in widely used Indian chewing tobacco and cigarette tobacco by neutron activation followed by sequential radiochemical separation (RNAA). Differential Pulse Anodic Stripping Voltammetry (DPASV) has been used for the estimation of lead, cadmium and copper in cigarette tobacco and its smoke aerosols. The reliability of the data has been assured by analyzing standard reference materials, bovine liver (NBS-1577) and orchard leaves (NBS-1571), and intercomparison of the Pb, Cd and Cu values by three techniques, namely, RNAA, DPASV and Energy Dispersive X-ray Flourescence technique (EDXRF). The levels of Hg, Cd, As, Pb and Cu in cigarette and chewing tobacco and the estimated intake of Cd, Cu and Pb to the smoker are presented and discussed. 相似文献
9.
M. Saiki 《Journal of Radioanalytical and Nuclear Chemistry》2001,248(2):413-416
In this work instrumental neutron activation analysis was applied todetermine trace elements in nail clippings and to make a comparison betweenthe results obtained from samples from healthy children and those with cysticfibrosis (CF) disease. The findings indicated that fingernails from the CFgroup present higher concentrations of Cl, Cr, K and Na than those found inthe control group. On the other hand, the lowest concentrations for Cr werefound in the CF group. For the Al, As, Co, Fe, Mg, Mn, Se and Zn elementsthere were no differences between the results obtained for the CF and controlgroups. The quality control of the results was evaluated by analysing NIST1577b Bovine Liver and NIST 1566a Oyster Tissue standard reference materials. 相似文献
10.
Determination of trace elements in some Nigerian vegetable based oils by neutron activation analysis
I. Umar 《Journal of Radioanalytical and Nuclear Chemistry》2001,249(3):669-671
The concentrations of some essential micronutrient elements leadingto short-lived activation products in four Nigerian vegetable based oils (palmoil, palm kernel oil, sheabutter and groundnut oil) have been determined byneutron activation analysis using a small research reactor. One sample ofeach material was analysed and presented as an introduction for further investigations.Results indicate that the concentration range of the elements are 19.4–44.0µg/g for Al; 30.0–81.0 µg/g for Ca; 11.9–60.4 µg/gfor Cl; 1.43–5.96 µg/g for Cu; 7.3–28.1 µg/g for Mg;0.47–1.69 µg/g for Mn; 17.5–72.8 µg/g for Na and 0.04–0.07µg/g for V. The experimental procedure is suitable for routine determinationof micronutrient element in foods for control and monitoring purposes. 相似文献
11.
R. E. P. Leite W. Jacob-Filho M. Saiki L. T. Grinberg R. E. L. Ferretti 《Journal of Radioanalytical and Nuclear Chemistry》2008,278(3):581-584
Neutron activation analysis was applied to assess trace element concentrations in brain tissues from normal (n = 21) and demented individuals (n = 21) of both genders aged more than 50 years. Concentrations of the elements Br, Fe, K, Na, Rb, Se and Zn were determined.
Comparisons were made between the results obtained for the hippocampus and frontal cortex tissues, as well as, those obtained
in brains of normal and demented individuals. Certified reference materials, NIST 1566b Oyster Tissue and NIST 1577b Bovine
Liver were analyzed for quality of the analytical results. 相似文献
12.
N. B. Ivanenko A. A. Ganeev N. D. Solovyev L. N. Moskvin 《Journal of Analytical Chemistry》2011,66(9):784-799
Main approaches to the trace element analysis of biological fluids and problems appearing in this case are considered. The
specific character of these approaches is illustrated by the examples of the analysis of real samples for various trace elements.
The advantage of methods for the direct determination of trace elements in these samples is demonstrated. 相似文献
13.
H. Jaskólska L. Rowińska L. Waliś M. Radwan 《Journal of Radioanalytical and Nuclear Chemistry》1973,13(1):41-52
The previously elaborated methods of the determination of As, Sc, La, Au, W, Mo, Ga and In have been adapted to the analysis
of steel. Samples of Armco steel taken from three various points of a steel bar section were analysed. On the basis of the
results obtained the distribution of the elements determined along the steel bar section is discussed. 相似文献
14.
U. El-Ghawi N. Vajda Gy. Pátzay 《Journal of Radioanalytical and Nuclear Chemistry》1999,241(3):605-610
Samples of natural and fertilised soils were collected from Al-Gheran region, west of Tripoli, Libya. The samples were investigated
by means of INAA and ED-XRF for Al, Si, K, Ca, Sc, Cr, Mn, Fe, Co, Zn, Br, Rb, Sr, Y, Zr, Nb, Cs, Ba, Hf, Ta, Pb and Th. The
results indicate that the concentrations of K, Ca, Zn, Sr and Pb are 2–4 fold higher in fertilised compared to natural soil,
while the concentrations of Al, Si, Cr, Mn, Fe, Co, Rb, Y, Nb, Cs, Ba Ta and Th are nearly the same in all samples. Mn and
Fe values in two arable soils have been found to be 4–6 times lower than the average concentration in the earth's surface
soils. This study concludes that, although the levels of some trace elements important for human health are very low in both
natural and fertilised soils. Further research is needed to understand the full significance of the distribution transfer
and toxicity of trace elements introduced in imported fertilisers. 相似文献
15.
16.
I. O. Abugassa S. O. Abugassa Y. S. Khrbish A. T. Bashir K. Doubali N. Ben Faid 《Journal of Radioanalytical and Nuclear Chemistry》2006,269(3):643-646
Summary The trace elements composition of gallbladder stones samples of the types cholesterol, pigment and mixed stones in addition
to bile have been investigated by k0-instrumental neutron activation analysis (k0-INAA). The samples were obtained from several individuals of adult subjects of the Libyan population who undergone open surgery
of gallbladder (cholecystectomy) at Al-khadra University Hospital in Tripoli. The samples were lyophilized, irradiated together
with Au wire and Zr foil, which serve as flux ratio monitor and a parameter at TNRC. Concentrations of 24 elements in gallstone
and 23 elements in bile were determined. The levels of the trace elements in the various samples investigated are measured
and discussed. The reliability of the analysis was checked with several biological standard reference materials. 相似文献
17.
E. Cortés N. Gras L. Muñoz V. Cassorla 《Journal of Radioanalytical and Nuclear Chemistry》1982,69(1-2):401-415
Seven trace elements were determined in milk formulas, powder milk and infant food. Instrumental neutron activation analysis
was used for the analysis of Fe, Zn, Co, Cr and Rb, while As and Cu content was determined using radiochemical neutron activation
analysis. Differences were found in the trace element content of foods of the same type. Milk formulas are comparable with
human milk according to the results obtained for the elements analyzed. The samples of powder cow's milk presented similar
concentrations of the elements studied. Liver with vegetables was found to have the highest Cu content. A meal prepared at
home, made of beef and fresh vegetables showed a higher trace element content than its similar commercial one. An estimation
of the daily intake of the elements analyzed was made and compared with minimum recommended daily ingestion. 相似文献
18.
Concentrations of up to 16 elements have been determined in subcellular fractions of bovine kidney using INAA methods. Levels of Rb and Se have been measured by a cyclic INAA method. A conventional INAA method consisting of 2 irradiations and 3 counting periods has been employed to determine the other elements. Accuracy of measurements has been evaluated by analyzing several standard reference materials. Trace element content of reagents used has been investigated in detail. Fresh samples of bovine kidney have been homogenized in a buffer containing sucrose and HEPES, and the homogeneate separated into nuclei, mitochondrial, lysosomal, microsomal and cytosol fractions by successive differential centrifugation. Concentrations of trace elements have been measured in these fractions using the INAA methods. 相似文献
19.
20.
R. P. Meshcheryakov I. P. Chernov A. N. Oblivantsev B. I. Kuznetsov G. I. Tronov A. G. Rybasov 《Journal of Radioanalytical and Nuclear Chemistry》1973,16(2):427-438
A method is presented for determining the concentration of light elements in a surface layer up to 15 μm deep, utilizing the
anomalous increase in elastic scattering cross-sectional area when high-energy alpha-particles are scattered by light nuclei
through large angles. For the separation of the short-lived nuclide17F, isotope-exchange between the solid and liquid phases was applied. 相似文献