Portable flow-injection analyzer with liquid-core waveguide based fluorescence, luminescence, and long path length absorbance detector

A collinear light-emitting diode-induced fluorescence detector for capillary electrophoresis

“…The combination of extremely high stability, reasonably high intensity, small size, low cost, and very long lifetime makes LED an attractive excitation source for spectroscopic detectors [7,8]. Several groups have made significant contributions to LED-based fluorescence detection used in CE.…”

“…Bruno et al [3] presented LEDinduced fluorescence detector (LED-FD) in CE using named pigtailing approach, in which the optical components used for in this detector were assembled into a compact unit using refractive-index matching materials to minimize losses and generation of stray light at the various optical interfaces. Dasgupta and coworkers [4,8] described the use of LED-FD combined with liquid-core waveguide technique in CE, achieving in 200 amole fluorescein of mass detection limit. Recently, Hillebrand et al [9] reported a LED-FD in CE using a pulsed mode-operating ultraviolet LED.…”

An on-line instrument for mobile measurements of the spatial variability of hexavalent and trivalent chromium in urban air

“…Liquid core waveguide (LCW) optical cells have been used to increase the sensitivity of colorimetric methods (Lei et al, 1983) and have been successfully applied to Cr(VI) determination with the DPC method (Li et al, 2003;Yao and Byrne, 1999). A LCW provides long optical pathlength by constraining light propagation within a liquid medium which has a higher refractive index (RI) than the surrounding solid tubing (Lei et al, 1983).…”

Development of a Compact System for the Determination of Lead Using a Liquid Core Waveguide and a Blue Diode as a Light Source

“…[8][9][10][11][12] The light introduced into the liquid core of aqueous samples undergoes total internal reflection at the wall of the Teflon tube. Some analytical applications using both LED and LCW have been reported, 13,14 however, there have not been total systems focused on USB-driven LED and LCW. A light-weight property and power supply through USB cable to a LED and LCW-UV system are very important to establish in situ compact analytical systems.…”