NEWS
Element Ubb D-Torch 3% TDS Ubb SDT 2.2% TDS Improvement in Ubb with D-Torch
Zn 334 0.001710 0.003025 43%
Pb 220 0.001136 0.001879 40%
Table 4: Uncertainty measurements: ceramic D-Torch vs. Semi-Demountable Quartz Torch
With the exception of the torch, all other components of the sample introduction system were the same: DuraMist nebulizer, Tracey TFE
spray chamber and a 2.4mm i.d. alumina injector. The duration of each analytical run was approximately 3.4 hours. Due to this improvement
in signal stability with the fully ceramic D-Torch, the calculated uncertainties for Zn and Pb showed a significant improvement over the
semi-demountable torch. The uncertainties calculated in Table 4 are bottle to bottle uncertainties (ubb) and were determined using a single
factor analysis of variance algorithm.
Conclusions
In summary this application spotlight shows the importance of selecting the proper sample introduction system to best fit your application
needs. By optimizing their ICP-OES for high TDS measurements, Inorganic Ventures has drastically reduced the amount of sample introduced
into the plasma and cut down on interrupted runs. Both sample introduction setups, SeaSpray/Twister and DuraMist/Tracey TFE, provided
excellent sensitivity and precision in the presence of varying concentrations of high TDS. A fully ceramic D-Torch helps to reduce consumable
cost and increase plasma stability in the presence of difficult sample matrices. In the next phase of this collaboration Inorganic Ventures will
look to further improve their ICP-OES and ICP-MS measurement accuracy by incorporating the IsoMist temperature controlled spray chamber
and the Assist syringe driven sample introduction accessory. The use of the IsoMist significantly improves long-term signal stability by holding
the spray chamber at a constant temperature. The Assist will cut sample analysis time in half and improve precision by eliminating the signal
pulsations which occur with the peristaltic pump delivery system.
References
1. Glass Expansion Newsletter, June 2013.
2. Glass Expansion Newsletter, October 2011.
3. Glass Expansion Newsletter, February 2013.
www.geicp.com Glass Expansion Newsletter | Issue 32 | page 4
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