Agilent Technologies 1200 Infinity Series - Page 99

Agilent 1200 Infinity Series DAD User Manual 99
Optimizing the Detector
5
Optimizing Selectivity
Figure 28 Selectivity by Ratio Qualifiers
In a four-component mixture, only biphenyl was recorded. The other three
peaks were suppressed because they did not meet the ratio-qualifier criterion
and therefore the output was set to zero. The characteristic wavelengths
249 nm (λ
1
) and 224 nm (λ
2
) were found from the spectra shown in Figure 27
on page 98. The ratio range was set at 2 – 2.4 (2.2 ±10%). Only when the ratio
between 249 and 224 nm was within this range, is the signal plotted. Of all
four peaks, only the third fulfilled the criterion (Figure 28 on page 99). The
others were not plotted.
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