Sensitive measurement of methylene blue active substances by attenuated total reflection spectrometry with a trimethylsilane-modified glass slab optical waveguide.
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.
Umemura
Tomonari
T
Department of Chemistry, Faculty of Engineering, Gunma University, Kiryu, Japan.
Kasuya
Yuichi
Y
Odake
Tamao
T
Tsunoda
Kin-ichi
K
D008751:Methylene Blue; D013053:Spectrophotometry / Q000295:instrumentation / Q000379:methods; D013501:Surface-Active Agents / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D008751:Methylene Blue