NO2 flame for Si 251.6nm line Absorbance issue

Issue

Si analysis with NO2/C2H2 flame, the Absorbance results for main line (251.6nm) is always zero for standard with increasing concentration, there is not proportionality between standard in the calibration, the auto zero increases increases if the fuel is increased. the blank and the air gives different auto zero Absorbance What described above, happens with cookbook characteristic concentration, and higher concentration.

Environment

• iCE3300
• iCE3500

Resolution

Try the secondary line secondary for Si 250.7nm.