Liquid Chromatography Detectors - The UV Detectors > The Diode Array Detector > Page 54

Figure 35  Diode Array Spectra Demonstrating Peak Purity


A chromatogram is shown containing five peaks and spectra have been taken of peak (a) and peak (b) halfway up the rising side of each peak, at the top of each peak and halfway down the trailing edge of each peak. The spectra are also included in the figure 35. The impure and pure peak are unambiguously identified illustrating the value of this type of detecting system for analytical purposes.


The performance of both types of multi-wavelength detectors are very similar and typical sensitivities would be about 1 x 10-7g/ml (significantly less than the fixed wavelength detector) with a linear dynamic range of about 5000 and a response index lying between 0.97 and 1.03.