A Long Pathlength Spectrophotometric Tegafur Detector Using a Liquid-Core Waveguide

Abstract

A Liquid-Core Waveguide (LCW) detection system for high sensitive determination of tegaful (FT) was developed. In this system the LCW cell was connected to the end of a hollow cathode lump and the other end to a UV spectrometer. A sample solution containing FT was pumped to the LCW cell through a T-shaped connector. A UV absorption of analyte was detected by the UV spectrometer. The configuration of connectors of LCW cell to the light source and the UV detector was designed. Stable and high responses of FT were obtained in a double tube system in which an edge of LCW cell was covered with another tube with large diameter was set in the T-connector. It was found that the UV absorption response of FT obtained in this LCW system depends on the core length and the concentration of FT. The sensitivity of FT obtained by using 65 cm of the LCW cell length was 10-fold higher than that of using 1 cm cell which was often used with a conventional UV-visible detector.

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

“…; Biogeneral Co. Ltd., San Diego, CA, USA) was connected at the end of a blue diode, and the another end to a compact UV-visible spectrometer (USB 2000-UV-VIS, Ocean Optics Inc., FL, USA) by T-shape connectors. 11 The blue LED component was custom-fabricated by Sato Denki (Tokushima, Japan). The total weight of the system, which consisted of a syringe pump, the LED, the LCW (100 cm), and a compact UV-visible spectrometer, was within 1.5 kg.…”

“…A Teflon AF 2400 has a low refractive index (RI = 1.29), which is lower than that of water (RI = 1.33). [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.…”

Espectrofotometria de longo caminho óptico em espectrofotômetro de duplo-feixe convencional: uma alternativa simples para investigações de amostras com densidade óptica muito baixa

“…[1][2][3][4] Estes trabalhos pioneiros da aplicação de um LCW em espectrofotometria, como os de Byrne et aℓ., 1,2 utilizam um aparato óptico próprio, com sistemas de lentes e fibras ópticas convencionais, bem como fontes e detectores específicos e exclusivos para o sistema espectrofotomé-trico, o que torna o sistema relativamente oneroso e dedicado. Aqui propomos a montagem de um dispositivo que permite acoplar uma cela capilar LCW a um espectrofotômetro convencional, de maneira simples e de fácil execução.…”