Sensitive measurement of methylene blue active substances by attenuated total reflection spectrometry with a trimethylsilane-modified glass slab optical waveguide

Abstract

Attenuated total reflection spectrometry with a slab optical waveguide (SOWG) was explored for the simple, rapid and sensitive measurement of total anionic surfactants by the methylene blue active substance (MBAS) method. A fused-silica sheet used as a guiding layer was modified with trimethylsilane (TMS) to extract and concentrate the MBASs on the SOWG surface. Based on preliminary studies of the adsorption behavior and visible ATR spectrum of MB on the modified silica surface, a detection wavelength of 600 nm was chosen for the sensitive measurement of anionic surfactants. When the concentration of MB was set at 10 microM in the final measurement solution, the calibration curve for a typical anionic surfactant (sodium dodecylbenzenesulfonate) was linear up to 0.6 microM and the detection limit was 0.07 microM. The proposed method was applied to the determination of total anionic surfactants in river water.

Study of adsorption behaviors of meso-tetrakis (4-N-Methylpyridyl) porphine p-Toluenesulfonate at indium–tin-oxide electrode/solution interface by in-situ internal reflection spectroscopy and cyclic voltammetry

“…Internal reflection spectroscopy has been recognized as a very sensitive and selective technique for in-situ detection of UV-VIS absorbance spectra of adsorbed molecules at the solid/liquid interfaces [7][8][9][10][11][12][13][14][15][16]. In this method, multiple internal reflection of incident light at the interface gives rise to the evanescent wave, which exponentially decreases with increase of the distance from the interface to the interior of the adjacent medium.…”

Detection of Moisture in Oil Using Evanescent Absorption from Sapphire Optical Waveguide Coated with Co-Doped Silica Film

“…To facilitate measuring the moisture-content of oil, other groups have developed capacitance (Raadnui and Kleesuwan 2005), photoacoustic spectroscopy (Foster et al 2001), and FT-IR (van de Voort et al 2007) methods. Metal salts such as Co 2þ , and Cu 2þ are sensitive to the presence of water and are widely included (especially CoCl 2 ) in silica gel drying agents as moisture indicators.…”

“…To measure the absorption spectra of this functional film, we use optical waveguide (OWG) spectrometry. The use of evanescent waves in OWG spectrometry has recently attracted attention for the study of interface phenomena and ion sensing optodes (Kang and Meyerhoff 2006;Ohno et al 2002;Umemura et al 2002;Umemura et al 2006;N. Matsuda et al 2003).…”

Assessment of the hemolysis and endothelial cell cytotoxicity induced by residual linear alkylbenzene sulfonates on pharmaceutical rubber stoppers based on HPLC‐ESI‐MS

“…Therefore, it is essential to establish an accurate and rapid method to monitor and control the LAS residues on pharmaceutical rubber stoppers. Multiple methods have been developed to detect LAS compounds, including attenuated total reflection spectrometry (Umemura et al, 2002), a fluorescence enhancement method based on the color reaction (Zhu et al, 2004), high-performance liquid chromatography (HPLC;Castles et al, 1989;Marcomini and Giger, 1987;Nimer et al, 2007) and capillary zone electrophoresis (Ding and Liu, 2001). However, these methods fail to effectively separate the linear homologs.…”