Spectrophotometric study of uranium(VI) chelate formation with beta-diketones and tributyl phosphate in aqueous, nona(oxyethylene) dodecyl ether solution.
The distribution ratio of uranium(VI) with 2-thenoyltrifluoroacetone, 2-furoyltrifluoroacetone and benzoyltrifluoroacetone in the presence and absence of tributyl phosphate between micellar and bulk phases in nona(oxyethylene) dodecyl ether solution was measured spectrophotometrically as a function of hydrogen-ion concentration. The thermodynamic constants for these reactions were evaluated from the variation of the equilibrium constants as a function of temperature. The entropy change contributes to the synergistic reaction.
The ultraviolet spectrophotometric determination of iron with 2-thenoyltrifluoroacetone in an aqueous solution containing .ALPHA.-hydro-.OMEGA.-dodecyloxynona(oxyethylene).
2-Thenoyltrifluoroacetone is used as a spectrophotometric reagent for the iron(III) ion (0–1.5 (μg ml−1) in a 0.5% α-hydro-ω-dodecyloxynona(oxyethylene) aqueous solution at pH 3.2–3.8. The molar absorptivities of the iron(III) complex at 338, 388, and 500 nm are 4.75×104, 2.30×104, and 4.85×103 1 mol−1 cm−1 respectively. Many diverse ions do not interfere.
A Study on Technology Embedded English Classes Using QR Codes
The development of information and technology has brought plenty of changes to the educational environment. The prevalence of smart phones is particularly playing a huge role in shaping learning methods. Smart phones provide the opportunity to scan QR codes, which can greatly ease access to information. Due to a high recognition speed, recognition rate, and restoration rate, they can be useful tools for English teachers to use in their class. In this study, we suggest using QR codes for writing and picture descriptions. Based on this study, more research should invest in Technology Embedded English teaching models to create better English classes for students.