PubMed · 3504952
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E Van Handel. 1987. A sulfide detection test for field use.. https://pubmed.ncbi.nlm.nih.gov/3504952/
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Ultrafiltration of micellar solutions containing sodium dodecylsulfate (SDS) and oxyethylated coconut fatty acid methyl esters (OMC-10) and their binary mixtures were studied and used to recover methylene blue. This was achieved through solubilization in mixed negatively charged micelles. Under the experimental conditions used, no significant fouling of the membrane comprising of cellulose, polyethersulfone and polyvinylidene fluoride was observed, with no retardation of ultrafiltration. The introduction of a nonionic surfactant to SDS reduced the critical micelle concentration of mixed micelles and then the concentration of surfactants in the permeate, i.e., from 8.3 x 10(-3)M for SDS to 2.0 x 10(-3) M for the mixture of SDS:OMC-10 = 4:1. Such a tailored surfactant mixture enabled the authors to achieve 93-94% retention of methylene blue using a hydrophilic membrane made of cellulose. Ultrafiltration of micellar solutions could also be considered a research method, helpful in determining important parameters such as micelle loading and the micelle binding constant used to characterize micellar solutions. Additionally the distribution coefficient employed in extraction studies can be resolved.
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.
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