Glass Expansion is pleased to announce the release of the new IsoMist Programmable Temperature Spray Chamber, providing the benefits of a temperature-controlled ICP sample introduction system in a compact, convenient package.
Peltier Effect Termperature Control
The temperature is electronically controlled using a powerful inbuilt Peltier device. You can select any temperature between –10°C and +60°C in 1°C increments to provide the optimum conditions for any application. The rapid response of the Peltier device allows a spray chamber temperature of –5°C to be reached within 15 minutes.
Bluetooth® Wireless Communication
For maximum convenience, the IsoMist can be controlled from your PC via a Bluetooth® wireless interface, although a standard USB network connection can also be used.
Reduced Oxide Interferences in ICP-MS
By introducing the sample at low temperature, the IsoMist reduces oxides as shown in Figure 2, resulting in fewer interferences and improved detection limits.
Figure 2. Effect of IsoMist Temperature on ICP-MS Oxide Ratio; Data Courtesty of David Jones, ALS Chemex.
Perfect for Volatile Organics
The temperature can be set as low as –10°C to reduce the solvent load on the plasma and allow the straightforward ICP-MS or ICP-OES analysis of even the most volatile organic solvents. The following table shows results for naphtha with a 10ppb spike obtained at –10°C. The two measurements were made 90 minutes apart using the same calibration data and demonstrate excellent stability for this very volatile sample.
Figure 3. Reproducibility of naphtha results at –10°C (measurements at 90 minute interval)
Stable Temperature Improves Precision
By holding the spray chamber at a stable temperature, the IsoMist significantly improves long-term signal stability, increasing the likelihood of calibration checks passing.
Heating Mode Enhances Sensitivity
For samples with limited volume, the sensitivity can be enhanced by using a low-uptake nebulizer and running the spray chamber at an elevated temperature. The following table shows that the detection limit with a sample uptake of 20 µL/min is better at 60°C than 21°C and is almost as good as that obtained with a standard system running at 21°C with a sample uptake of 2 mL/min.
Figure 4. Detection limits at 21°C and 60°C
Proven Cyclonic Spray Chamber
The IsoMist incorporates the proven Twister cyclonic spray chamber, combining excellent sensitivity and precision with exceptionally fast washout. This spray chamber now incorporates Glass Expansion’s proprietary Helix nebulizer interface which has a zero dead volume seal and provides for convenient nebulizer insertion and removal. For use with the IsoMist, the spray chamber is encapsulated with special thermally conducting material. This spray chamber is compatible with the full range of Glass Expansion nebulizers.
Figure 5. Encapsulated Twister Spray Chamber
Completely Self-Contained Ergonomic Package
The compact design includes a rugged, low maintenance, chemically-resistant polypropylene housing. It provides a much more convenient alternative to a jacketed spray chamber with an external chiller because it does not require an external source of coolant. It is compatible with almost all ICP-MS and ICP-OES models.
Contact firstname.lastname@example.org for details on connecting the IsoMist to your specific model of ICP-MS or ICP-OES.
Figure 6. IsoMist on Perkin Elmer Optima
Figure 7. IsoMist on Varian Vista