Determination of selenium in animal tissue samples using radioisotope induced X-ray fluorescence

1992 ◽  
Vol 163 (2) ◽  
pp. 355-362 ◽  
Author(s):  
M. A. Tariq ◽  
I. L. Preiss
Keyword(s):  
Animal Tissue ◽  
Tissue Samples ◽  
X Ray

Determination of the structure of tissue samples using X-ray small angle scattering

2000 ◽  
Vol 196 (12) ◽  
pp. 827-830 ◽  
Author(s):  
Martin Bradaczek ◽  
Hans Guski ◽  
Hans Bradaczek ◽  
Georgi G. Avtandilov
Keyword(s):  
Small Angle ◽  
Small Angle Scattering ◽  
Tissue Samples ◽  
X Ray ◽  
Angle Scattering

Cleanup with Two Florisil Columns for Gas Chromatographic Determination of Multiple Pyrethroid Insecticides in Products of Animal Origin

1994 ◽  
Vol 77 (6) ◽  
pp. 1634-1638 ◽  
Author(s):  
Guo-Fang Pang ◽  
Tie-Sheng Zhao ◽  
Yan-Zhong Chao ◽  
Chun-Lin Fan
Keyword(s):  
Detection Limit ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Animal Tissue ◽  
Animal Origin ◽  
Tissue Samples ◽  
Pyrethroid Insecticides ◽  
Coefficients Of Variation ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method was developed for the simultaneous determination of 9 pyrethroid insecticides in products of animal origin. The multiresidues of the pyrethroids in different samples were extracted with acetone–petroleum ether (1+1), and extracts were cleaned up on a Florisil partition column and a Florisil adsorption column. Four animal tissue samples were examined at 0.05–0.25 ppm fortification levels. The average recoveries of all insecticides were 76.9–88.0%, and the coefficients of variation were <4.6% for all insecticides except permethrin. The detection limits of the method were ca 5 ppb for all insecticides but permethrin, which had a detection limit of ca 10 ppb.

Method for the Detection of Desmethylbromethalin in Animal Tissue Samples for the Determination of Bromethalin Exposure

2015 ◽  
Vol 63 (21) ◽  
pp. 5146-5151 ◽  
Author(s):  
Michael S. Filigenzi ◽  
Adrienne C. Bautista ◽  
Linda S. Aston ◽  
Robert H. Poppenga
Keyword(s):  
Animal Tissue ◽  
Tissue Samples

Modified Gas-Liquid Chromatographic Method for Determination of Compound 1080 (Sodium Fluoroacetate)

1982 ◽  
Vol 65 (5) ◽  
pp. 1102-1105 ◽  
Author(s):  
Iwao Okuno ◽  
Dennis L Meeker ◽  
Robert R Felton
Keyword(s):  
Ethyl Acetate ◽  
Animal Tissue ◽  
Gas Liquid Chromatography ◽  
Tissue Samples ◽  
Fluoroacetic Acid ◽  
Acetone Water ◽  
Liquid Chromatographic Method ◽  
Special Apparatus ◽  
Liquid Chromatographic

Abstract A method capable of determining 0.1 ppm 1080 (sodium fluoroacetate) in 1 g animal tissue was developed. It involves extraction of 1080 from the sample with acetone-water, and then evaporation of the acetone followed by extraction of 1080 as fluoroacetic acid from water with ethyl acetate. Ethyl acetate is removed by volatilization from fluoroacetic acid which is retained as the triethanolammonium fluoroacetate salt. Fluoroacetic acid is subsequently derivatized with α-bromo-2,3,4,5,6-pentafluorotoluene and quantitated by gas-liquid chromatography with an electron capture detector. The method is rapid and requires no special apparatus or equipment and no more than 12 ml of any one solvent. Recoveries of 1080 from tissue samples fortified with 0.1-100 ppm averaged about 85%.

Gas Chromatographic Determination of Diethylstilbestrol Residues in Animal Tissues

1973 ◽  
Vol 56 (2) ◽  
pp. 352-357 ◽  
Author(s):  
David E Coffin ◽  
Jean-Claude Pilon
Keyword(s):  
Electron Capture ◽  
Chromatographic Determination ◽  
Animal Tissue ◽  
Alkaline Solutions ◽  
Animal Tissues ◽  
Tissue Samples ◽  
Acetone Extraction ◽  
Chromatographic Detection

Abstract A procedure is described for the determination of diethylstilbestrol residues in various tissues of beef, chicken, and lamb. This involves acetone extraction of the tissue, HCl hydrolysis, liquid-liquid partition between CHCl3 and aqueous acidic and alkaline solutions, formation of diethylstilbestrol trifluoroacetates, elution of the trifluoroacetates from a Chromosorb W column, and electron capture gas chromatographic detection and measurement of the diethylstilbestrol trifluoroacetates. Recoveries of diethylstilbestrol obtained from a variety of animal tissue samples spiked at 2–10 ppb levels were 70–110%.

Lateral resolution of the electron microbeam analysis

1978 ◽  
Vol 36 (1) ◽  
pp. 542-543
Author(s):  
H.J. Dudek
Keyword(s):  
Quantitative Analysis ◽  
Depth Resolution ◽  
Lateral Resolution ◽  
Cylindrical Particle ◽  
Correction Procedure ◽  
X Ray ◽  
Element Concentrations ◽  
Microbeam Analysis ◽  
The Matrix

The chemical inhomogenities in modern materials such as fibers, phases and inclusions, often have diameters in the region of one micrometer. Using electron microbeam analysis for the determination of the element concentrations one has to know the smallest possible diameter of such regions for a given accuracy of the quantitative analysis.In th is paper the correction procedure for the quantitative electron microbeam analysis is extended to a spacial problem to determine the smallest possible measurements of a cylindrical particle P of high D (depth resolution) and diameter L (lateral resolution) embeded in a matrix M and which has to be analysed quantitative with the accuracy q. The mathematical accounts lead to the following form of the characteristic x-ray intens ity of the element i of a particle P embeded in the matrix M in relation to the intensity of a standard S

Sem and X-Ray Analysis of Renal and Biliary Calculi

1976 ◽  
Vol 34 ◽  
pp. 306-307
Author(s):  
R. J. Narconis ◽  
G. L. Johnson
Keyword(s):  
Chemical Constituents ◽  
Natural State ◽  
X Ray Diffraction ◽  
Chemical Methods ◽  
X Ray ◽  
Additional Dimension ◽  
Biliary Calculi ◽  
Calculus Formation ◽  
Scanning Electron

Analysis of the constituents of renal and biliary calculi may be of help in the management of patients with calculous disease. Several methods of analysis are available for identifying these constituents. Most common are chemical methods, optical crystallography, x-ray diffraction, and infrared spectroscopy. The application of a SEM with x-ray analysis capabilities should be considered as an additional alternative.A scanning electron microscope equipped with an x-ray “mapping” attachment offers an additional dimension in its ability to locate elemental constituents geographically, and thus, provide a clue in determination of possible metabolic etiology in calculus formation. The ability of this method to give an undisturbed view of adjacent layers of elements in their natural state is of advantage in determining the sequence of formation of subsequent layers of chemical constituents.

Preparation And elemental analysis of ancient fibers

1987 ◽  
Vol 45 ◽  
pp. 410-411
Author(s):  
Allen Angel ◽  
Kathryn A. Jakes
Keyword(s):  
Cross Sections ◽  
Physical Structure ◽  
Energy Dispersive ◽  
Archaeological Sites ◽  
X Ray ◽  
Long Term Storage ◽  
Backscattered Electron ◽  
Electron Imaging

Fabrics recovered from archaeological sites often are so badly degraded that fiber identification based on physical morphology is difficult. Although diagenetic changes may be viewed as destructive to factors necessary for the discernment of fiber information, changes occurring during any stage of a fiber's lifetime leave a record within the fiber's chemical and physical structure. These alterations may offer valuable clues to understanding the conditions of the fiber's growth, fiber preparation and fabric processing technology and conditions of burial or long term storage (1).Energy dispersive spectrometry has been reported to be suitable for determination of mordant treatment on historic fibers (2,3) and has been used to characterize metal wrapping of combination yarns (4,5). In this study, a technique is developed which provides fractured cross sections of fibers for x-ray analysis and elemental mapping. In addition, backscattered electron imaging (BSI) and energy dispersive x-ray microanalysis (EDS) are utilized to correlate elements to their distribution in fibers.

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