ICP-MS多原子离子的干扰

仪器资料 · 发表于 2018-4-26 15:44:01

ICP-MS多原子离子的干扰
Common molecular ion interferences in ICP-MS
While the ICP-MS technique is relatively free from
interferences, there are instances where ion species
generated from the ICP and/or the sample matrix can
cause a significant background at certain masses.1
The formation of these polyatomic ions can limit the
ability of ICP-MS to determine some elements of
interest. Fortunately, most elements have at least
one isotope that is free from overlap by these
isobaric interferences.
Dilute nitric acis is the preferred matrix for ICP-MS
work, because it does not introduce any molecular
ions that are not already present from water and
dissolved or entrained air. The few interferences
found with this matrix are listed in Table 1.
Other acids, especially those containing Cl, S or P,
should be avoided. Table 2 indicates the extra
complexity of the mass spectrum caused by the
presence of these acids, and lists the isotopes that
would be subject to interference.
When potentially interfering elements are known to
be present, their effects can often be minimized by
appropriate sample pre-treatment such as ion
exchange or solvent extraction.
A comprehensive list of potential molecular ion
interferences for each isotope is provided in the
software of the Varian UltraMass ICP-MS.

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