How can measure cd by graphite furnace?

12 April 2020 0 3K Report

I have a Pg AA 500 instrument.

The absorbance of Cd and Pb by flame is excellent but i can't measure them by GF-AA. There is no peak in atomization stage.

I have checked many heating programs. In the two final stages I see temperature shooting. For example when I set the forth stage on 1300 C and the fifth on 1500 C, the furnace temperature reach to 1800 and 2200 respectively. Is it normal?

I have checked all parameters which may affect the absorbance, but unfortunately i don't have any absorbance.

Thanks for your time and help.

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