Electron microscopy energy-dispersive analysis

Studies of the inorganics in cotton dust have incorporated the use of a wide variety of techniques. These include X-ray fluorescence spectroscopy, atomic absorption spectroscopy, electron microscopy, energy dispersive analysis of X-rays, X-ray diffraction, atomic absorption spectroscopy, neutron activation analysis and petrographic microscopy. It is necessary to use a wide array of techniques since no single technique will permit the measurement of all trace elements. Steindard chemical techniques to determine the ash content of samples and of various extracts have also been used. In most of these studies the ash fraction has been considered to be a reasonably accurate measure of the inorganic content. 

To identify nanoparticles there are several analytical techniques, including crystalline nature, surface plasmon resonance, size, shape, stability, nature, etc., which was done by various analytical instruments, such as UV-visible spectroscopy, X-ray diffractometry, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, energy dispersive analysis, zeta potential, etc. These are mostly used for analysis of synthesized nanoparticles, which helps us to study crystalline nature, functional groups, and morphological studies, and to identify its stability. 

Transmission electron microscopy energy dispersive X-ray analysis has also been used to image intracellular Se granules present from Se bioreduction in bacteria. Reduction of selenite and the deposition of elemental Se in cell cytoplasm or in the extracellular space may be lead to promising bioremediation schemes.172... 

Denotes composition determined by analytical electron microscopy (energy dispersive X-ray analysis). 

R. S. White, and A. D. Owens, Automation of Gunshot Residue Detection and Analysis by Scanning Electron Microscopy/Energy Dispersive X-Ray Analysis (SEM/EDX), Journal of Forensic Sciences 32, no. 6 (November 1987) 1595. 

SEM/EDX scanning electron microscopy/energy dispersive X-ray analysis SPE solid phase extraction... 

Gilardoni, S., Fermo, P., Cariati, F., Gianelle, V., Pitea, D., Collina, E., andLasagni, M. (2004). MSWI fly ash particle analysis by scanning electron microscopy—energy dispersive X-ray spectroscopy. Environ. Sri. Technol. 38, 6669—6675. 

Modes of occurrence of the elements in coal can be determined using a variety of procedures. Perhaps the most effective method is the use of scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDX). This method can detect and analyze minerals as small as 1 pm in diameter (Figure 14). The SEM-EDX also provides useful information on the textural relationships of the minerals. Other microbeam techniques, such as the electron microprobe analyzer, ion microprobe, laser mass analyzer, and transmission electron microscopy, have also been used to determine modes of occurrence of elements in coal. 

The ingress of electrolyte cations into the MOF framework was confirmed by scanning electron microscopy/energy-dispersive x-ray (EDX) analysis of electrochemically treated deposits of Cu-MOF. Results obtained after application of a reductive potential step to Cu-MOF crystals in contact with acetate buffers are shown in Figure 5.3. Here, EDX spectra for (a) pristine Cu-MOF and (b) Cu-MOF after application of a constant potential of-1.0 V for 10 min are shown. EDX spectra of original Cu-MOF crystals exhibits prominent Cu peaks at 1.0, 8.0, and 8.4 keV accompanied by a Si signal at 1.9 keV. After the electrolysis step, an additional Na peak at 1.1 keV appears. 

Sherman, L. R., K. T. Roberson, and T. C. Thomas. 1989. Qualitative analysis of asbestos fibers in air, water and bulk samples by scanning electron microscopy-energy dispersive x-ray... 

Methods of analysis for GSR have evolved along with the instrumentation available for elemental analysis. Prior to the advent of scanning electron microscopy-energy-dispersive X-ray (SEM-EDX) techniques, (flame and graphite furnace) atomic absorption was the principal analytical technique employed. Suspected GSR was collected with the use of wipes or swabs moistened with 1% nitric acid, and the residue collected was introduced into the instrument. Less frequently used were neutron activation analysis (NAA), anodic stripping voltammetry, and photoluminescence techniques. ICP methods (AES and MS) appear promising, but have not been widely used to date for GSR. 

---