Figure 10. Glass Expansion Twister baffled cyclonic spray chamber design features.
Helix fixes nebulizer depth and
provides the optimum interface
for minimizing dead volume
Precisely placed
groove guarantees
smooth draining
Baffle cut at angle
and fused to bottom
prevents droplet
formation
Vertical wall ensures
maximum transport
efficiency
UniFit connector and capillary included
with all pumped drain chambers
Application Spotlight
Figure 8. Signal stability obtained from a homogeneity assessment of a custom blend CRM when
using the fully ceramic D-Torch compared to a semi-demountable quartz torch.
0 50 100 150 200 250
Analysis Time (min)
% Normalized Intensity
110%
105%
100%
95%
90%
85%
Zn 334.502nm 3.0% TDS
D-Torch/Ceramic/HF Intro System
Zn 334.502nm 2.2% TDS
Semi-Demountable Torch/HF Intro System
NI 174.828nm 3.0% TDS
D-Torch/Ceramic/HF Intro System
NI 174.828nm 2.2% TDS
Semi-Demountable Torch/HF Intro System
Pb 220.353nm 3.0% TDS
D-Torch/Ceramic/HF Intro System
Pb 220.353nm 2.2% TDS
Semi-Demountable Torch/HF Intro System
New D-Torch models have recently been released for the Agilent
5100 and 5110 ICP-OES, PerkinElmer Avio ICP-OES, SPECTRO
Arcos II and SPECTRO Blue ICP-OES (Figure 9). These new D-Torch
models feature the same auto aligning and locking mechanism of
the corresponding standard torches, but in a robust demountable
design which is compatible with a ceramic outer tube. The D-Torch is
currently available for a range of ICP-OES and ICP-MS instruments,
see the Glass Expansion website for a complete list.
Figure 9. New D-Torch releases.
Agilent 5100/5110 PerkinElmer Avio
SPECTRO Blue
SPECTRO Arcos II/
Spray Chamber Selection
Glass Expansion spray chambers are manufactured with specific
design features to provide the utmost performance. The design
characteristics of the TwisterTM cyclonic spray chamber are detailed
in Figure 10. Unique to all Glass Expansion spray chamber
designs is our proprietary HelixTM zero dead volume nebulizer
interface. Eliminating the dead volume around the nebulizer seal
leads to faster washout times and higher sample throughput.
This improvement in washout is shown in Figure 11,
where a 10 ppm standard washes out in 4 seconds with
the Twister compared to 16 seconds with a “Brand-X”
spray chamber.9 Washout is especially important with
high matrix samples, as high concentrations will take longer to
completely rinse out.
Figure 11. 10 ppm Mo washout Comparison between Helix and non-Helix spray chambers.
1 2 4 6 8 10 12 14 16 18
Time (seconds)
Emission Counts
0
8000
6000
4000
2000
The Twister cyclonic spray chamber also features a central transfer
tube, which acts as a secondary droplet filter to reduce the mean
droplet size. This helps to reduce the sample load within the plasma
without compromising detection limits and improving precision
(% RSD). The reduced sample load helps to increase torch life,
slow salt build-up at the injector tip, and decrease the frequency of
cleaning ICP-MS interface cones. These features make a baffled
cyclonic spray chamber, like the Twister, the ideal choice for a high
TDS application.
Nebulizer Selection
When dealing with high TDS samples, we recommend using the
SeaSprayTM, Glass Expansion’s worldwide market-leading high
performance concentric glass nebulizer. The SeaSpray comprises a
unique self-washing tip designed to prevent crystal growth, providing
a tolerance of up to 20% TDS. The SeaSpray’s popularity is due to
its ability to offer outstanding nebulization efficiency for trace level
analyses combined with excellent precision and a high tolerance
to TDS.
www.geicp.com Glass Expansion Newsletter | Issue 43 4
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