Energy Dispersive Spectroscopy (EDS)

A chemical analysis technique often used to analyze samples, or features on samples, which are too small for other types of analysis.

scanning electron microscopeScanning Electron Microscope (SEM) equipped with an Energy Dispersive Spectrometer (above).

red Blood Cells Energy Dispersive Spectrum imageRed blood cells magnified 20,000 times by the SEM.

EDS identifies the elements present in a sample and determines their relative percentages. Amounts as low as 1/10th of one percent can be detected. EDS is a “Mass Spectroscopy” technique which identifies all the detectable elements present in a sample, rather than only specific elements requested by the analyst as is common in many other chemical analysis techniques. (see Scanning Electron Microscope)

sem Complex Inclusion-EDSSEM image of a complex inclusion magnified 500 times.

eds Analysis Inclusion EDSEDS analysis of this inclusion (right) revealed the presence of a broad range of elements.