| Stable Sample Introduction (SSI) Dual Spray Chamber |
Author
Kenneth Ong
PerkinElmer Life and Analytical Sciences 710 Bridgeport Avenue Shelton, CT 06484 USA
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Stable Sample Introduction (SSI) Dual Spray Chamber Stretching the Detection Limit of ICPOES
Detection limit is commonly understood to be the smallest concentration we can measure with a particular technique. In fact it is the point at which we can make a decision whether the element or compound is present or not. As such to be able to improve instrument capability of differentiating a true signal from noise, one of achieving this is to reduce the signal noise.
SSI is an enhanced stability sample introduction system designed for ICP analysis requiring higher precision. The double pass spray chamber Improve signal stability up to 2x to 3x, yet provide fast rinse-out time, reducing the rinse time between samples.
Figure 1. SSI spray chamber connect to Optima with FAST autosampler.
The figure below demonstrated the noise improvement in 1ppm of Mn with SSI spray chamber compare to a standard cyclonic spray chamber.
Figure 2. 1 ppm Mn Stability Cyclonic, Non-Baffled
Figure 3. 1 ppm Mn Stability Cyclonic, Baffled
Figure 4. 1 ppm Mn Stability SSI Spray Chamber
The Stability in signal translate to better signal ratio and thus better detection limits, the table below show a comparison in the performance between SSI and a standard cyclonic spray chamber.
|
| Spray Chamber |
Cyclonic |
SSI |
SSI |
| Total Time (min) |
2:30 |
2:30 |
4:16 |
| Sample Loop |
2 mL |
2 mL |
4 mL |
| As 193.696 |
0.005 |
0.003 |
0.001 |
| Be 313.107 |
0.0001 |
0.0001 |
0.00008 |
| Pb 220.353 |
0.004 |
0.003 |
0.001 |
| Mn 257.607 |
0.0002 |
0.0001 |
0.0001 |
| Sb 206.836 |
0.002 |
0.002 |
0.0009 |
| Se 196.026 |
0.005 |
0.004 |
0.002 |
| Tl 190.801 |
0.004 |
0.003 |
0.002 |
| Zn 213.854 |
0.0005 |
0.0005 |
0.0005 |