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A New Versatile Programmable Temperature Spray
Chamber for ICP Jerry Dulude and Ron Stux (USA),
Vesna Dolic (Australia), Glass Expansion
(www.geicp.com)
Introduction
Low Temperature Applications
Elevated Temperature Applications
Constant Temperature Benefits
For both ICP-OES and ICP-MS, the temperature of
the spray chamber can have a profound influence
on the ability of the system to achieve high
quality results in a variety of sample types.
This paper describes a novel system that both
monitors and controls spray chamber temperature,
and evaluates the device under a variety of
conditions for a variety of applications. All
ICP-MS work was performed on a PerkinElmer Elan
6000 and all ICP-OES work on a PerkinElmer Optima
2100 DV.
Two low temperature control applications are
investigated. Reduction of oxide interferences in
ICP-MS Direct aspiration of naphtha, a volatile
organic solvent that severely loads the plasma.
Increasing spray chamber temperature increases
the transport efficiency of the sample
introduction system. At typical uptake rates of
1 to 2 ml per minute, this would result in an
unstable plasma. However, when sample volume is
limited as is often the case in certain clinical
samples, very low uptake rates must be used. In
this case increasing the spray chamber
temperature will not overload the plasma and will
allow lower detection limits to be reached as
shown below. Data taken under standard
conditions.
Signal drift is closely associated with the drift
of spray chamber temperature. Initially as the
spectrometer warms up, there is a constant upward
drift in temperature. Subsequently, the spray
chamber temperature drifts along with the
environmental temperature of the laboratory. The
figure below shows how stabilizing the spray
chamber temperature has a dramatic effect on
stabilizing the analytical signal over the long
term.
Description

• The IsoMist Programmable Temperature Spray
  Chamber is shown below and has the following
  characteristics
• Programmable from -10 to 60C in 1degree
  increments
• Maintains temperature to within 0.1 degree C
• Compact design (7.5x4x4 inches)
• 100 self-contained (no external water lines)
• Communicates via wireless Bluetooth technology or
  USB
• Compatible with all ICP-OES ICP-MS models

Data generated on a Sciex6000 ICP-MS at 1.1L/min
argon nebulizer flow using a Conikal nebulizer
and Twister spray chamber. RF power was 1400
watts.
Figure 5 Long-term drift in ICP-OES with and
without temperature control
Figure 1 IsoMist Programmable Temperature Spray
Chamber
DISCUSSION and CONCLUSIONS

• Clearly, the effect of spray chamber temperature
  on performance for both ICP-OES and ICP-MS is
  profound. For a variety of reasons, however,
  this parameter has not been accurately controlled
  in many situations, particularly for ICP-OES.
  These reasons include the following
• The unruliness and messiness of external chiller
  systems that have been employed with jacketed
  spray chamber
• The unavailability of customized chamber control
  systems for all models
• With the advent of the IsoMist Programmable
  Temperature Spray Chamber, the above reasons go
  away. This enables the ICP-OES and ICP-MS
  analyst to customize a method with respect to all
  important parameters including spray chamber
  temperature.

1500 watts on PE2100DV SeaSpray nebulizer and
Twister spray chamber Neb gas at 0.35LPM, uptake
at 0.3ml/min 1mm bore injector. Coolant gas
flow was 20LPM AUX flow was 1.8LPM.