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Mass Spectrometry
Mass spectrometry is used to measure the atomic or molecular mass of different particles in a

The analysis takes place using a mass spectrometer.


Mass spectrometry can be used to identify the mass and relative abundance of different
isotopes in an element such as the two…

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How a mass spectrometer works

Inlet valve Sample is introduced via a sample inlet
Most liquids vaporise at the low pressure in the machine but solids need to
be heated on special probes
The sample is turned into a gas

Ionisation area A heated filament produces high-energy electrons.
These electrons…

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Using Mass Spectra to Calculate Relative Atomic Mass and Relative Isotopic

The mass spectrum of Boron

X-axis: shows the mass: charge ratio (m/z)
of each ion detected

Y-axis: intensity (%)

How to calculate the relative atomic mass

1. For each peak, read the % relative isotopic abundance from the…


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