Determination of total glucosinolates in oilseed rape by X-ray spectrometric analysis for oxidised sulphur (S6+)

1993 ◽  
Vol 61 (1) ◽  
pp. 79-86 ◽  
Author(s):  
Andrew Pinkerton ◽  
Peter J Randall ◽  
Patricia A Wallace ◽  
Margaret M Vonarx ◽  
Rodney J Mailer
Keyword(s):  
Oilseed Rape ◽  
Spectrometric Analysis ◽  
X Ray

Determination of Wear Metals in Oil by X-Ray Spectrometry

1985 ◽  
Vol 29 ◽  
pp. 503-509
Author(s):  
Ya-Wen Liu ◽  
A.R. Harding ◽  
D.E. Leyden
Keyword(s):  
Trace Elements ◽  
Thermal Degradation ◽  
Lower Limit ◽  
Organic Material ◽  
Limit Of Detection ◽  
Spectrometric Analysis ◽  
Trace Impurities ◽  
X Ray

AbstractTrace elements in oil may be determined by adsorption of the oil sample onto maguesium oxide followed by thermal degradation of the organic material. The resulting powder is easily pressed into a pellet suitable for X-ray spectrometric analysis. The lower limit of detection depends upon the trace impurities in the MgO and is a few parts per million for most elements determined.

X-Ray Spectrometric Determination of Atmospheric Aerosols

1972 ◽  
Vol 16 ◽  
pp. 165-176
Author(s):  
Henry Chessin ◽  
E.H. McLaren
Keyword(s):  
Atmospheric Aerosols ◽  
Cold Front ◽  
Analytical Tool ◽  
Spectrometric Analysis ◽  
Calibration Technique ◽  
X Ray ◽  
Aqueous Salt Solutions ◽  
Contamination Levels ◽  
Lower Limits

AbstractX-ray spectrometric analysis is examined as an analytical tool for elemental determinations of atmospheric aerosols. Contamination levels of the several filters used for collection purposes are examined and the results reported. A calibration technique is described for analysis of several elements in the microgram range based on collection of saturated vapors of aqueous salt solutions. The calibration curves together with an analysis of sensitivity and lower limits of detection are shown. The technique is employed to monitor continuously aerosol content in the atmosphere during passage of a cold front.

Structure and stereochemistry of a 7-phosphabicyclo[2.2.1]hept-2-ene-7-oxide from X-ray, multinuclear NMR, and 2D-J resolved NMR studies

1990 ◽  
Vol 68 (7) ◽  
pp. 1020-1028 ◽  
Author(s):  
Martin B. Hocking ◽  
Gordon W. Bushnell
Keyword(s):  
Nmr Assignments ◽  
Spectrometric Analysis ◽  
Fragmentation Pattern ◽  
Nmr Studies ◽  
X Ray ◽  
Thermal Fragmentation ◽  
Structural Assignment ◽  
Synthetic Reaction ◽  
Formed Adduct

Preparations of a 7-phosphanorbornene, from the reaction of 1,2,5-triphenylphosphole-1-oxide with inhibited acrylonitrile in benzene, were repeated under various conditions to determine if one, or more than one, stereoisomer was formed. Adduct formation failed to occur when the reaction was attempted in ethanol, or when the precursor 1,2,5-triphenylphosphole was substituted for the phosphole oxide. Elemental analysis and spectroscopic measurements confirmed that a 1:1 adduct had been obtained, and an X-ray structure determination of the ethanol complex established that this was 5-cyano-1,4,7-triphenyl-7-phosphabicyclo[2.2.1]hept-2-ene-7-oxide, 3a. Details of the 1H, 13C, and 31P NMR assignments, of potential value in the structural assignment of other similar adducts, are related to previous results. The results of a brief mass spectrometric analysis of the changes in the thermal fragmentation pattern of the adduct with temperature are discussed in relation to the synthetic reaction. Keywords: phosphole adduct, phosphanorbornene, phosphabicycloheptene, acrylonitrile.

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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