ASTRUM App NOTE
Measurement of High Purity Metals Using the Astrum GD-MS: The Effect of Sample-Cell Cooling
There are few analytical techniques capable of quantifying trace impurities in ultra-pure metals. One technique that has gained acceptance and is widely used in the industry is glow discharge mass spectrometry (GD-MS). Instruments of this kind require extremely low background levels. However, this can be difficult to achieve and therefore the design of the instrument is critical, particularly with regard to the glow discharge cell region. One method that can be used to reduce the presence of molecular species is to cool the glow discharge cell region using either a Peltier cooling system or else liquid nitrogen cooling. In this note, we compare the residual background measured on a Nu Astrum GD-MS for a number of elements using different glow discharge cell temperatures.
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