The beam of light must be of small radius and focused directly on the capillary for accurate results. Generally, the capillary itself is used as the sample holder and passes through a UV-vis detector.īecause the capillary tube is so thin compared to conventional path lengths, care needs to be taken in the design of the detector. Detection is nearly universal, and with fused-silica as the sample holder, wavelengths from 200nm through the visible spectrum can be used without interference. UV-visible absorption is the most common detection technique for CE.
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