Ultraviolet spectroscopy diode array detectors

The most commonly-used detectors are those based on spectrophotometry in the region 184-400nm, visible ultraviolet spectroscopy in the region 185-900nm, post-column derivativisation with fluorescence detection (see below), conductivity and those based on the relatively new technique of multiple wavelength ultraviolet detectors using a diode array system detector (described below). Other types of detectors available are those based on electrochemical principles, refractive index, differential viscosity and mass detection. 

The use of multiple detectors has also introduced the possibility of determining the compositional heterogeneity of copolymers, in those cases where the average chain composition varies with chain length [35] (see Section 11.2.3). For this purpose ultraviolet diode array spectroscopy, IR spectroscc y, NMR or mass spectrometry [35] detectors can be utilized. 

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