AL
Figure 4 – Stability comparison of three internal standard lines with and without Elegra (see text for details).
35 minutes, eventually resulting in a failed analysis (>10% drift). With the Elegra there was virtually no variation in IS signal over a four-hour period. The laboratory reported a signifi cant reduction in required nebulizer maintenance—more than two months without a cleaning compared to weekly cleaning with- out the Elegra.
With respect to the ICP torch injector tube, a larger bore (>2.0 mm i.d.) is recommended for high-TDS applications. Since the torch outer tube often suff ers rapid devitrifi cation, a demountable torch design such as the Glass Expansion D-Torch is suggested since it reduces torch consumable costs.6
Increasing the auxil-
iary argon fl ow will lift the plasma higher off the injector, slowing salt buildup at the injector tip. Extended rinses in between each sample are also recommended. However, lengthy rinses can be avoided by adding Elegra since it pro- vides the greatest decrease in the rate of salt buildup at the injector tip.
Conclusion
The compact Elegra argon humidifier helps alleviate salt deposits in ICP nebulizers and torch injectors, allowing uninterrupted and maintenance-free operation. Efficient mem- brane technology eliminates the need for a pressurized water reservoir, heating and electric power. Inert, metal-free construction eliminates the possibility of contamination. An easy-to-use bypass switch allows the humidifier to be taken off-line without disconnecting any
argon lines and the Elegra Dual channel model provides the ability to humidify both the neb- ulizer gas and a dilution gas simultaneously.
References
1. Agilent Technologies Application Note#
5989-7737EN.www.agilent.com/cs/ library/technicaloverviews/public/5989- 7737EN.pdf
2. Agilent Technologies Application Note #5991-4257EN.
www.agilent.com/cs/ library/applications/5991-4257EN_ AppNote7900_ICP-MS_salt.pdf
3. Perkin Elmer Product Note #012394-01.
www.perkinelmer.com/CMSResources/ Images/44-175832PRD_NexION-AMS-Sys- tems-Product-Note-012394_01.pdf
4. Agilent Technologies Application Note #5989-8573EN.
www.agilent. com/cs/l ibrary/technicaloverviews/ public/5989_8573EN.pdf
5. Glass Expansion Newsletter, June 2013, “A Nebulizer Update.”
6. Glass Expansion Newsletter, October 2013, “How to Achieve High Accuracy with Dif- fi cult Samples.”
Dr. Ryan Brennan is marketing manager, and Mr. Jerry Dulude is president, Glass Expansion, 4 Barlows Landing Rd., Pocasset, Mass. 02559, U.S.A.; tel.: 508-563-1800; e-mail: rbrennan@
geicp.com;
www.geicp.com. Dr. Vesna Dolic is director of the ICP laboratory, Glass Expansion Pty., Melbourne, Australia.
AMERICAN LABORATORY 13 APRIL 2016
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