NEWS
At higher temperatures the data is more accurate according to
Figure 3; both platinum wavelengths measured by ICP are closest
to the wet chemistry gravimetric figure when the IsoMist is at
40°C. But what is the effect of the IsoMist on the precision of the
measurements?
Figure 4 show the frequency distribution of the RSD (%) for each
of the elements analysed with a conventional spray chamber and
those analysed with an IsoMist set at 30°C. A higher proportion of
low RSD values implies that the data is more “precise”. Although
the data set is small there is an indication that the IsoMist
has improved the accuracy and precision of precious metal
measurements.
Figure 4: Frequency histogram of RSDs of precious metal measurements n = 10 taken with a conventional spray chamber left figure and those measurements taken using
an IsoMist set at 30°C right figure. A higher proportion of measurements in the lower bins suggests high precision.
HINTS FOR TH E OPERATOR
How to remove stubborn o-rings
Several years ago, Glass Expansion introduced the spray
chamber with Helix, in which the nebulizer is held in place by an
inert PTFE seal. The Helix eliminates the problems with o-rings
and it has become the preferred system. However, some of
the older-style spray chambers with o-rings are still in use. It is
common for the o-rings to bond to the glass, making them very
difficult to remove. The removal of o-rings is now much easier
thanks to the introduction of the Glass Expansion O-ring Tool.
It can be ordered as part number 50-100-1636.
www.geicp.com Glass Expansion Newsletter | Issue 22 | page 3
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/wrapper.pl?c1=Showpart&partno=50-100-1636
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